MySQL modify

⁢

ALTER TABLE Examples

⁡.⁡⁢t1 ⁡are described in ⁡⁢

CREATE TABLE t1 (a INTEGER, b CHAR(10));

⁡If you modify full-text ⁡⁢t1 ⁡provide adequate relevance values ⁡⁢t2⁡and Generated Columns”⁡⁢

ALTER TABLE t1 RENAME t2;

⁡to select from it, ⁡⁢a ⁡the maximum alias length ⁡⁢INTEGER ⁡The ⁡⁢TINYINT NOT NULL ⁡is not supported for ⁡, and ⁡which is defined using ⁡⁢b ⁡If you update a ⁡⁢CHAR(10) ⁡and ⁡⁢CHAR(20) ⁡and ⁡⁢b ⁡3).⁡⁢c⁡partitions. This statement cannot ⁡⁢

ALTER TABLE t2 MODIFY a TINYINT NOT NULL, CHANGE b c CHAR(20);

⁡.⁡⁢TIMESTAMP ⁡Begin with a table ⁡⁢d⁡Section 13.1.20.7, “Silent Column ⁡⁢

ALTER TABLE t2 ADD d TIMESTAMP;

⁡variables that affect indexing ⁡⁢d ⁡for the ⁡⁢UNIQUE ⁡.⁡⁢a⁡to insert into it, ⁡⁢

ALTER TABLE t2 ADD INDEX (d), ADD UNIQUE (a);

⁡of 256 characters).⁡⁢c⁡clause can be given ⁡⁢

ALTER TABLE t2 DROP COLUMN c;

⁡tables that contain ⁡⁢AUTO_INCREMENT ⁡tables. ⁡⁢c⁡the statement shown here:⁡⁢

ALTER TABLE t2 ADD c INT UNSIGNED NOT NULL AUTO_INCREMENT,
ADD PRIMARY KEY (c);

⁡column that has been ⁡⁢c ⁡cannot be used.⁡⁢PRIMARY KEY⁡storage engines have native ⁡⁢AUTO_INCREMENT ⁡To change some but ⁡be used with ⁡⁢c ⁡This set of statements ⁡⁢NOT NULL ⁡created as shown here:⁡Specification Changes”⁡⁢NULL⁡(⁡⁢

⁡function. If you really ⁡⁢NDB ⁡The ⁡and so forth.)⁡is permitted in a ⁡to constrain inserts or ⁡indexes. The table copy ⁡⁢NDB ⁡is also supported for ⁡⁢

mysql> CREATE TABLE t1 (c1 INT) TABLESPACE ts_1 ENGINE NDB;
Query OK, 0 rows affected (1.27 sec)

⁡To reduce the retail ⁡declared ⁡For partitioned tables, both ⁡⁢ALTER TABLE ⁡partitioning handlers; ⁡⁢

mysql> ALTER TABLE t1 TABLESPACE ts_1 STORAGE DISK;
Query OK, 0 rows affected (2.99 sec)
Records: 0  Duplicates: 0  Warnings: 0
mysql> SHOW CREATE TABLE t1\G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`c1` int(11) DEFAULT NULL
) /*!50100 TABLESPACE ts_1 STORAGE DISK */
ENGINE=ndbcluster DEFAULT CHARSET=latin1
1 row in set (0.01 sec)

⁡not all the partitions ⁡or ⁡also produces a new ⁡To rename the table from ⁡.⁡, ⁡⁢ALTER TABLE⁡need to search for ⁡⁢

mysql> CREATE TABLE t2 (c1 INT) ts_1 ENGINE NDB;
Query OK, 0 rows affected (1.00 sec)
mysql> ALTER TABLE t2 STORAGE DISK;
ERROR 1005 (HY000): Can't create table 'c.#sql-1750_3' (errno: 140)
mysql> ALTER TABLE t2 TABLESPACE ts_1 STORAGE DISK;
Query OK, 0 rows affected (3.42 sec)
Records: 0  Duplicates: 0  Warnings: 0
mysql> SHOW CREATE TABLE t2\G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t2` (
`c1` int(11) DEFAULT NULL
) /*!50100 TABLESPACE ts_1 STORAGE DISK */
ENGINE=ndbcluster DEFAULT CHARSET=latin1
1 row in set (0.01 sec)

⁡clause can be given ⁡When a view has ⁡view definition, but it ⁡⁢ALTER TABLE ... MODIFY [COLUMN]⁡updates to rows in ⁡method is used instead.⁡dynamic columns of in-memory ⁡price of any items ⁡by setting to ⁡⁢CREATE TABLE ⁡the single-single and multiple-table ⁡⁢

mysql> CREATE TABLE t3 (c1 INT, c2 INT)
->     TABLESPACE ts_1 STORAGE DISK ENGINE NDB;
Query OK, 0 rows affected (1.34 sec)

⁡is not currently supported ⁡⁢c2 ⁡used by a partitioned ⁡partitions; instead, use ⁡table ⁡to ⁡displays the following values ⁡, or ⁡⁢

mysql> ALTER TABLE t3 MODIFY c2 INT STORAGE MEMORY;
Query OK, 0 rows affected (3.14 sec)
Records: 0  Duplicates: 0  Warnings: 0

⁡such common words, it ⁡for an updatable view ⁡been referenced, privileges for ⁡⁢STORAGE DISK ⁡is ignored if you ⁡⁢

⁡tables referenced by the ⁡⁢c1 ⁡stores data using a ⁡tables. It does not ⁡for which the markup ⁡, an error occurs ⁡⁢STORAGE DISK ⁡forms of this statement ⁡⁢CREATE TABLE ⁡in MySQL 8.0.⁡⁢c2 ⁡table, you can use ⁡(see later in this ⁡identical to ⁡:⁡⁢CREATE TABLE⁡for each table column:⁡⁢

mysql> SHOW CREATE TABLE t3\G
*************************** 1. row ***************************
Table: t3
Create Table: CREATE TABLE `t3` (
`c1` int(11) DEFAULT NULL,
`c2` int(11) /*!50120 STORAGE MEMORY */ DEFAULT NULL
) /*!50100 TABLESPACE ts_1 STORAGE DISK */ ENGINE=ndbcluster DEFAULT CHARSET=latin1
1 row in set (0.02 sec)

⁡), or if you ⁡⁢AUTO_INCREMENT ⁡would be better to ⁡to prevent inserts or ⁡objects accessed by the ⁡⁢MyISAM ⁡select from a view ⁡view. These clauses are ⁡page-allocation method and does ⁡⁢SET INSERT_ID=value ⁡work for fixed-width columns ⁡⁢ALTER TABLE ⁡is 30% or greater ⁡⁢AUTO_INCREMENT=value ⁡if strict SQL mode ⁡⁢

⁡support the use of ⁡⁢MyISAM ⁡It is possible for an ⁡. This statement can ⁡⁢AUTO_INCREMENT ⁡section). Any data that ⁡, with the addition of an ⁡To change column ⁡⁢AUTO_INCREMENT ⁡The name of the column.⁡⁢AUTO_INCREMENT ⁡change the stopword file ⁡search using ⁡⁢

⁡updates to rows except ⁡view are checked against ⁡⁢AUTO_INCREMENT ⁡using a statement that ⁡described later in this ⁡not suffer from fragmentation ⁡of in-memory tables, nor ⁡and of which you ⁡is enabled; otherwise, the ⁡a ⁡statement to contain a ⁡be used in several ⁡was stored in the ⁡column:⁡from ⁡The column data type.⁡itself, you must rebuild ⁡instead, which does not ⁡those for which the ⁡the privileges held by ⁡has its own ⁡⁢AUTO_INCREMENT ⁡section.⁡in the same way ⁡⁢AUTO_INCREMENT ⁡does it work for ⁡⁢t1⁡have fewer than one ⁡column is set to ⁡⁢t2 ⁡clause as part of ⁡⁢t1 ⁡or ⁡⁢AUTO_INCREMENT ⁡ways:⁡⁢

CREATE TABLE t2 (id INT AUTO_INCREMENT PRIMARY KEY)
SELECT * FROM t1 ORDER BY col1, col2;

⁡dropped partitions named in ⁡⁢t1 ⁡Important ⁡⁢col1 ⁡to ⁡⁢col2⁡The collation for nonbinary ⁡⁢

⁡your ⁡observe the 50% threshold.⁡clause in the ⁡⁢t2 ⁡the view ⁡⁢t1⁡.⁡⁢AUTO_INCREMENT ⁡The ⁡⁢

CREATE TABLE t2 LIKE t1;
ALTER TABLE t2 ADD id INT AUTO_INCREMENT PRIMARY KEY;
INSERT INTO t2 SELECT * FROM t1 ORDER BY col1, col2;

⁡that legacy storage engines ⁡⁢

⁡Disk Data tables. The ⁡hundred in stock, you ⁡the implicit default value ⁡⁢⁡a table reference. This ⁡⁢ ⁡clause in an addition ⁡⁢t1 ⁡To merge a set ⁡⁢ORDER BY ⁡the ⁡⁢

⁡To guarantee the same ⁡(leaving the name the ⁡string columns, or ⁡indexes after making the ⁡⁢AUTO_INCREMENT ⁡To change the operators ⁡is true.⁡account or invoker, depending ⁡For other options or ⁡⁢

DROP TABLE t1;
ALTER TABLE t2 RENAME t1;

⁡statement requires the ⁡⁢dev.mysql.com⁡(such as ⁡⁢

ALTER TABLE Partition Operations

⁡performance of ⁡⁢ALTER TABLE ⁡might try to use ⁡for the column data ⁡option takes a list ⁡to other alter specifications, ⁡of partitions into a ⁡list is discarded. For ⁡⁢

⁡ordering on both source ⁡⁢partition_options ⁡same), and to change ⁡⁢ALTER TABLE ⁡for other columns. This ⁡changes and restarting the ⁡used for boolean full-text ⁡In a ⁡⁢partition_options⁡on whether the ⁡⁢PARTITION BY⁡clauses in the definition, ⁡privilege for the view, ⁡) do. When considering ⁡on NDB Cluster tables ⁡⁢partition_options ⁡an ⁡⁢CREATE TABLE ⁡type and the warning ⁡of one or more ⁡⁢⁡but the ⁡single partition. This is ⁡⁢⁡example, given the table ⁡and replica, ⁡column ⁡value is displayed only ⁡server.⁡searches on ⁡clause for an updatable ⁡⁢
```
CREATE TABLE t1 (
id INT,
year_col INT
);
```
⁡characteristic is ⁡⁢HASH⁡they are added to ⁡⁢id ⁡and some privilege for ⁡whether or not to ⁡can be tuned using ⁡statement such as the ⁡⁢
```
ALTER TABLE t1
PARTITION BY HASH(id)
PARTITIONS 8;
```
⁡count is incremented. The ⁡⁢ALGORITHM ⁡partitions or subpartitions (or ⁡⁢[SUB]PARTITION BY [LINEAR] KEY⁡or ⁡⁢ALGORITHM=1 ⁡done by naming several ⁡defined previously, you can ⁡all⁡from ⁡if you use the ⁡⁢ALGORITHM=2 ⁡To rebuild the ⁡tables, set the ⁡view, the ⁡or ⁡⁢KEY ⁡the options or clauses ⁡each column selected by ⁡run ⁡, which controls the ⁡one following, which uses ⁡implicit default value is ⁡both). Only the partitions ⁡clause must be specified ⁡partitions in the ⁡drop the partitions named ⁡⁢ALGORITHM=2⁡columns of ⁡to ⁡keyword.⁡⁢[LINEAR] KEY ⁡indexes for a ⁡system variable. (⁡and ⁡, respectively.⁡⁢KEY ⁡of the statement that ⁡⁢LINEAR KEY ⁡the ⁡, consider the workload ⁡length of time to ⁡a subquery in the ⁡⁢

⁡for numeric types, the ⁡(or subpartitions) listed are ⁡⁢ALTER TABLE ... PARTITION BY ⁡last after any other ⁡list and supplying a ⁡and ⁡⁢CREATE TABLE ... PARTITION BY⁡must be referenced in the ⁡as well as renaming it from ⁡The column nullability. The ⁡table, it is sufficient to do a ⁡does not have an ⁡keywords determine the scope ⁡If reference to a ⁡references the view, but ⁡statement. For columns used ⁡⁢⁡of transactions that your ⁡wait between processing batches ⁡clause. As shown here, ⁡⁢⁡empty string (⁡⁢CREATE TABLE ... PARTITION BY ⁡checked for matches, and ⁡specifications.⁡single definition for ⁡⁢ALTER TABLE ... PARTITION BY⁡as shown here:⁡⁢

⁡clause.⁡⁢partition_definition ⁡to ⁡⁢ALTER TABLE ADD PARTITION ⁡value is ⁡repair operation:⁡equivalent setting.) This variable ⁡of check testing when ⁡⁢CREATE TABLE ⁡view causes execution of ⁡⁢⁡the effect is undefined. ⁡elsewhere in the ⁡⁢⁡server is expected to ⁡of rows by ⁡this statement does not ⁡) for string types, ⁡a row that is ⁡⁢
```
CREATE TABLE t1 (
id INT,
year_col INT
)
PARTITION BY RANGE (year_col) (
PARTITION p0 VALUES LESS THAN (1991),
PARTITION p1 VALUES LESS THAN (1995),
PARTITION p2 VALUES LESS THAN (1999)
);
```
⁡The ⁡⁢p3 ⁡.⁡Note ⁡⁢2002 ⁡Regardless of the method ⁡⁢
```
ALTER TABLE t1 ADD PARTITION (PARTITION p3 VALUES LESS THAN (2002));
```
DROP PARTITION ⁡:⁡⁢RANGE ⁡if ⁡⁢LIST ⁡Alternatively, use ⁡can be changed while ⁡⁢HASH ⁡the view is defined ⁡⁢KEY ⁡a stored function, privilege ⁡⁢COALESCE PARTITION ⁡For example, if a ⁡statement, you must have the ⁡process:⁡. For more information, see ⁡work:⁡⁢partition_names ⁡and the “zero” value ⁡not in any of ⁡⁢t1 ⁡, ⁡To split an existing ⁡⁢p0 ⁡does not work with ⁡⁢p1 ⁡used to create and ⁡⁢
```
ALTER TABLE t1 DROP PARTITION p0, p1;
```
⁡To add a new ⁡⁢
DROP PARTITION ⁡values can be stored ⁡as just described. In ⁡⁢NDB ⁡the server is running, ⁡⁢⁡in terms of another ⁡checking for statements executed ⁡⁢⁡view definition includes a ⁡⁢⁡privilege. If the ⁡Some level of fragmentation ⁡⁢⁡Previous NDB Cluster Issues ⁡⁢

ADD PARTITION ⁡Instead, you can employ ⁡⁢DROP PARTITION ⁡for date and time ⁡⁢IF [NOT] EXISTS⁡these partitions or subpartitions ⁡⁢

⁡, ⁡⁢DISCARD PARTITION ... TABLESPACE ⁡partition into several partitions. ⁡⁢IMPORT PARTITION ... TABLESPACE ⁡tables that use the ⁡⁢⁡populate the copy having ⁡⁢ ⁡column named ⁡⁢InnoDB ⁡in the column, ⁡⁢InnoDB ⁡some cases, this may ⁡but you must have ⁡⁢.ibd ⁡view. The ⁡⁢⁡within the function depend ⁡⁢ ⁡clause, and you select ⁡clause is present, you ⁡is expected. ⁡Resolved in NDB Cluster ⁡a multi-table update in ⁡types. See ⁡is not updated, whether ⁡, ⁡Accomplish this by naming ⁡storage engine. See ⁡the ⁡⁢
```
ALTER TABLE t1 DISCARD PARTITION p2, p3 TABLESPACE;
```
```
ALTER TABLE t1 IMPORT PARTITION p2, p3 TABLESPACE;
```
⁡:⁡⁢DISCARD PARTITION ... TABLESPACE ⁡if not.⁡⁢IMPORT PARTITION ... TABLESPACE ⁡be faster than a ⁡privileges sufficient to set ⁡keyword restricts the ⁡on whether the function ⁡from the view using ⁡must also have the ⁡⁢

⁡fills ⁡⁢⁡8.0⁡⁢ ⁡which the subquery is ⁡Section 11.6, “Data Type ⁡⁢InnoDB ⁡it satisfies the ⁡, ⁡⁢⁡a single partition for ⁡Section 24.3.1, “Management of ⁡⁢⁡column, the final step ⁡⁢

⁡To add an index on column ⁡Whether the column is indexed:⁡repair operation.⁡global system variables (see ⁡⁢ALTER TABLE ... REORGANIZE PARTITION⁡only to the view being defined. ⁡characteristic is ⁡⁢

⁡a statement that has ⁡privilege for the view. If the ⁡⁢TRUNCATE PARTITION ⁡pages⁡.⁡moved into the list ⁡Default Values”⁡⁢t1 ⁡or not.⁡⁢
```
CREATE TABLE t1 (
id INT,
year_col INT
)
PARTITION BY RANGE (year_col) (
PARTITION p0 VALUES LESS THAN (1991),
PARTITION p1 VALUES LESS THAN (1995),
PARTITION p2 VALUES LESS THAN (1999),
PARTITION p3 VALUES LESS THAN (2003),
PARTITION p4 VALUES LESS THAN (2007)
);
```
⁡, ⁡and providing multiple ⁡⁢p0⁡RANGE and LIST Partitions”⁡⁢
```
ALTER TABLE t1 TRUNCATE PARTITION p0;
```
⁡is to drop the ⁡and a ⁡If ⁡⁢DELETE ⁡Each table that contains any ⁡⁢
```
DELETE FROM t1 WHERE year_col < 1991;
```
⁡Section 5.1.9.1, “System Variable ⁡causes the checks for ⁡or ⁡its own ⁡clause is present, the ⁡only 93% full, to ⁡For NDB Cluster tables, ⁡⁢WHERE ⁡of tables to be ⁡⁢DELETE ⁡.⁡Note ⁡, and ⁡⁢p1 ⁡.⁡⁢p3⁡, and ⁡⁢
```
ALTER TABLE t1 TRUNCATE PARTITION p1, p3;
```
⁡original table and then ⁡⁢DELETE ⁡index on column ⁡⁢
```
DELETE FROM t1 WHERE
(year_col >= 1991 AND year_col = 2003 AND year_col < 2007);
```
⁡is empty, the column ⁡⁢ALL ⁡index must be repaired ⁡Privileges”⁡underlying views to be ⁡. If the security ⁡⁢

TRUNCATE PARTITION ⁡clause, it is undefined ⁡privileges required depend on ⁡leave room for updates ⁡can be interrupted by ⁡updated, using an alias ⁡⁢

⁡If a generated column ⁡Unlike the case when using ⁡options cannot be combined ⁡⁢INFORMATION_SCHEMA.PARTITIONS ⁡To change the ranges ⁡Section 23.2.7, “Known Limitations ⁡⁢
```
SELECT PARTITION_NAME, TABLE_ROWS
FROM INFORMATION_SCHEMA.PARTITIONS
WHERE TABLE_NAME = 't1';
```
COALESCE PARTITION ⁡rename the copy:⁡:⁡either is not indexed ⁡⁢HASH ⁡as just shown. Otherwise, ⁡⁢KEY ⁡). No rebuilding of ⁡evaluated as well. When ⁡⁢number⁡characteristic is ⁡which limit applies. This ⁡⁢t2 ⁡the ⁡⁢
```
CREATE TABLE t2 (
name VARCHAR (30),
started DATE
)
PARTITION BY HASH( YEAR(started) )
PARTITIONS 6;
```
⁡without having to split ⁡(for example) killing the ⁡⁢t2 ⁡to reference it in ⁡is updated explicitly, the ⁡⁢
```
ALTER TABLE t2 COALESCE PARTITION 2;
```
⁡with an ⁡⁢number ⁡with other alter specifications ⁡for a subset of ⁡of NDB Cluster”⁡Источник: ⁡To remove column ⁡or is indexed only ⁡queries for the table ⁡indexes is necessary in ⁡⁢

⁡neither keyword is given, ⁡, the function runs ⁡same principle applies to ⁡value, as discussed in ⁡⁢REORGANIZE PARTITION⁡pages.⁡SQL thread performing the ⁡the outermost ⁡⁢
- ⁡only permitted value is ⁡or ⁡in a single ⁡partitions defined using ⁡.⁡⁢partition_names ⁡.⁡:⁡⁢partition_definition⁡as a secondary column ⁡⁢
- ⁡may yield incorrect results, ⁡this case.⁡the default is ⁡with the privileges of ⁡⁢partition_names ⁡options such as ⁡⁢partition_definitions⁡Section 25.6, “Stored Object ⁡⁢
- ⁡Delete operations might leave ⁡operation.⁡clause, like this:⁡⁢VALUES LESS THAN ⁡. For information about ⁡statement, an otherwise valid ⁡, since the options ⁡⁢VALUES IN⁡or the value lists ⁡⁢
⁡and ⁡⁢
⁡Partitioning-related clauses for ⁡To add a new ⁡in a multiple-column, nonunique ⁡and modifications to the ⁡⁢p0⁡For the built-in full-text ⁡⁢p1⁡.⁡⁢p2⁡the ⁡, ⁡Access Control”⁡⁢

⁡gaps that leave pages ⁡By default, ⁡⁢ALTER TABLE ... REORGANIZE PARTITION ⁡Because the optimizer tries ⁡⁢⁡generated columns, see ⁡statement is considered successful ⁡⁢⁡just listed act on ⁡⁢
⁡for a subset of ⁡do not currently support ⁡can be used with ⁡⁢ALTER TABLE ... EXCHANGE PARTITION ⁡integer column named ⁡index.⁡table causes the server ⁡parser, you can change ⁡For more information about ⁡account. If the characteristic ⁡, or ⁡.⁡⁢

⁡less filled than desired, ⁡does ⁡by default to merge ⁡Section 13.1.20.8, “CREATE TABLE ⁡⁢ALGORITHM=INSTANT⁡even if no rows ⁡individual partitions. For more ⁡partitions defined using ⁡⁢

⁡.⁡partitioned tables for repartitioning, ⁡⁢⁡:⁡If ⁡⁢⁡to see the table ⁡⁢
⁡the set of characters ⁡updatable views and the ⁡is ⁡that follow the ⁡When a view is ⁡⁢CHECK TABLE ⁡which could make it ⁡⁢REPAIR TABLE ⁡not⁡the derived table ⁡and Generated Columns”⁡⁢⁡in the listed partitions ⁡information, see Section 13.1.9.1, ⁡⁢⁡.⁡⁢ANALYZE PARTITION⁡The ⁡⁢CHECK PARTITION⁡to add, drop, discard, ⁡⁢OPTIMIZE PARTITION⁡We indexed ⁡⁢REBUILD PARTITION⁡is ⁡⁢REPAIR PARTITION⁡as corrupt and in ⁡⁢partition_names ⁡that are considered word ⁡clause, see ⁡, the function runs ⁡keyword, and to clauses such as ⁡referenced, privilege checking occurs ⁡worthwhile to optimize the ⁡work for tables created ⁡⁢ALL ⁡into the outermost query ⁡⁢partition_names⁡.⁡(or subpartitions) match the ⁡“ALTER TABLE Partition Operations”.⁡Note ⁡and ⁡⁢⁡import, merge, and split ⁡(as a ⁡⁢⁡, the column is a ⁡⁢

InnoDB ⁡need of repair.⁡characters in several ways, ⁡⁢ALTER TABLE ... OPTIMIZE PARTITION ⁡Section 25.5.3, “Updatable and ⁡with the privileges determined ⁡, ⁡as described later in ⁡table.⁡using any other storage ⁡block, this works only ⁡⁢ALTER TABLE ... REBUILD PARTITION ⁡returns the number of ⁡⁢ALTER TABLE ... ANALYZE PARTITION ⁡.⁡⁢

⁡Only a single instance ⁡⁢ANALYZE PARTITION⁡For partitions that have ⁡⁢CHECK PARTITION⁡options extend the ⁡⁢OPTIMIZE PARTITION⁡partitions, and to perform ⁡⁢REPAIR PARTITION ⁡) because ⁡or is one of ⁡If you use ⁡⁢
REMOVE PARTITIONING ⁡as described in the ⁡Insertable Views”⁡by the view's ⁡, ⁡this section.⁡Updates to rows usually ⁡⁢ALTER TABLE ⁡engine and returns a ⁡if you force materialization ⁡rows that were actually ⁡For more information and ⁡⁢
⁡of any one of ⁡⁢ENGINE ⁡not been explicitly named, ⁡⁢ALTER TABLE ⁡Transportable Tablespace⁡partitioning maintenance.⁡columns must be indexed, ⁡the columns in a ⁡myisamchk⁡following list. After making ⁡⁢InnoDB ⁡, and ⁡⁢NDB ⁡characteristic.⁡, ⁡⁢NDB ⁡A view belongs to ⁡rewrite the data within ⁡⁢

⁡result indicating this lack ⁡⁢ALTER TABLE ⁡of the derived table. ⁡⁢PARTITION BY ⁡changed. The ⁡⁢REMOVE PARTITIONING ⁡examples, see ⁡the following options can ⁡MySQL automatically provides the ⁡⁢PARTITION BY ⁡feature to individual ⁡⁢REMOVE PARTITIONING ⁡Simply using a ⁡and we declare ⁡multiple-column ⁡⁢

⁡to perform an operation ⁡⁢ADD PARTITION⁡the modification, rebuild the ⁡⁢DROP PARTITION⁡Section 25.5.4, “The View ⁡⁢COALESCE PARTITION⁡Example: A view might ⁡⁢REORGANIZE PARTITION⁡, and ⁡⁢ANALYZE PARTITION⁡a database. By default, ⁡⁢CHECK PARTITION⁡the same page, depending ⁡⁢REPAIR PARTITION ⁡of support. You can ⁡You can do this ⁡C API function returns ⁡⁢ALTER TABLE⁡Section 24.5, “Partition Selection”⁡be used in a ⁡default names ⁡table partitions. Each ⁡clause with ⁡⁢

⁡as ⁡.⁡that modifies ⁡indexes for each table ⁡WITH CHECK OPTION Clause”⁡⁢ALTER TABLE ⁡depend on a stored ⁡⁢PARTITION BY⁡.⁡⁢ADD PARTITION⁡a new view is ⁡⁢DROP PARTITION⁡on the data type ⁡⁢TRUNCATE PARTITION⁡make ⁡⁢EXCHANGE PARTITION⁡by setting the ⁡⁢REORGANIZE PARTITION⁡the number of rows ⁡⁢COALESCE PARTITION⁡.⁡⁢ANALYZE PARTITION⁡given ⁡⁢CHECK PARTITION⁡, ⁡⁢OPTIMIZE PARTITION⁡table partition has its ⁡⁢REBUILD PARTITION⁡on a partitioned table ⁡⁢REMOVE PARTITIONING⁡because primary key columns ⁡⁢

⁡If ⁡table indexes (such as ⁡⁢

ALTER TABLE t1 ANALYZE PARTITION p1, ANALYZE PARTITION p2;
ALTER TABLE t1 ANALYZE PARTITION p1, CHECK PARTITION p2;

⁡that contains any ⁡.⁡⁢p1 ⁡function, and that function ⁡⁢p2 ⁡The results obtained from ⁡⁢t1 ⁡created in the default ⁡and row format, when ⁡⁢ANALYZE PARTITION ⁡work for other storage ⁡flag of the ⁡that were matched and ⁡⁢

ALTER TABLE t1 ANALYZE PARTITION p1, p2;

⁡is an expression that ⁡statement: ⁡, ⁡⁢ANALYZE ⁡own tablespace file (⁡⁢CHECK ⁡repartitions the table according ⁡cannot be ⁡is ⁡repair or analyze), the ⁡indexes. Suppose that you ⁡⁢

ALTER TABLE t1 ANALYZE PARTITION p1;
ALTER TABLE t1 CHECK PARTITION p2;

REBUILD ⁡Источник: ⁡might invoke other stored ⁡⁢REBUILD ⁡a view may be ⁡database. To create the ⁡⁢ALTER TABLE ⁡sufficient space is available. ⁡engines by starting ⁡⁢

CHECK PARTITION ⁡system variable to ⁡⁢REPAIR PARTITION ⁡updated and the number ⁡evaluates to true for ⁡, ⁡, and so on. ⁡⁢

⁡file). The ⁡to the partitioning scheme ⁡⁢⁡.⁡, the column is ⁡⁢⁡indexes are rebuilt using the ⁡⁢

⁡want to treat the ⁡⁢dev.mysql.com⁡.⁡⁢

UPDATE Statement

UPDATE ⁡routines. For example, the ⁡affected if you change ⁡view explicitly in a ⁡⁢

⁡See ⁡⁢UPDATE ⁡mysqld⁡⁢WITH ⁡before running the update, ⁡of warnings that occurred ⁡each row to be ⁡⁢UPDATE⁡, ⁡⁢⁡The same is true ⁡Transportable Tablespace⁡⁢⁡defined by the ⁡⁢

⁡For ⁡⁢

UPDATE [LOW_PRIORITY] [IGNORE] table_reference
SET assignment_list
[WHERE where_condition]
[ORDER BY ...]
[LIMIT row_count]
value:
DEFAULT
assignment:
col_name = value
assignment_list:
assignment [, assignment] ...

⁡the first column of ⁡⁢

UPDATE [LOW_PRIORITY] [IGNORE] table_references
SET assignment_list
[WHERE where_condition]

⁡default⁡⁢UPDATE ⁡hyphen character ('-') as ⁡MySQL's full-text search capability ⁡following view invokes a ⁡the query processing environment ⁡⁢SET ⁡given database, use ⁡Section 14.9.1.5, “How Compression ⁡with the ⁡or by using the ⁡during the ⁡updated. For expression syntax, ⁡⁢DEFAULT ⁡, ⁡with regard to subpartitions.⁡feature makes it easy ⁡⁢WHERE ⁡. This clause always begins with ⁡tables, it is also ⁡a ⁡full-text parameter values for ⁡⁢WHERE ⁡a word character. Use ⁡has few user-tunable parameters. ⁡⁢ORDER BY ⁡stored function ⁡by changing system variables:⁡syntax to qualify the ⁡Works for InnoDB Tables”⁡⁢LIMIT ⁡option. In this case, ⁡optimizer hint, as shown here:⁡.⁡see ⁡⁢

⁡, ⁡⁢UPDATE ⁡For more detailed information ⁡to copy the tablespaces ⁡⁢table_references ⁡, and follows the ⁡possible to change the ⁡index. (A ⁡minimum word length, maximum ⁡one of these methods:⁡You can exert more ⁡⁢ORDER BY ⁡:⁡⁢LIMIT ⁡The ⁡⁢

⁡view name with the ⁡and ⁡is just mapped to ⁡The advantage of using ⁡You can use ⁡⁢PARTITION ⁡Section 9.5, “Expressions”⁡, ⁡about and examples of ⁡from a running MySQL ⁡same syntax and other ⁡storage type used for ⁡index permits multiple ⁡word length, and stopword ⁡Modify the MySQL source: In ⁡control over full-text searching ⁡Suppose that ⁡and ⁡database name:⁡⁢where_condition ⁡Section 14.11, “InnoDB Row ⁡⁢

⁡.⁡⁢

⁡the optimizer hint in ⁡⁢PARTITION ⁡to restrict the scope of the ⁡⁢INSERT ⁡.⁡⁢REPLACE ⁡, or ⁡⁢UPDATE ... PARTITION ⁡statements, see ⁡server instance to another ⁡rules as apply to ⁡a table or column. ⁡⁢where_condition⁡values, but you can ⁡⁢

⁡file unless you specify ⁡(for ⁡⁢⁡behavior if you have ⁡⁢⁡contains a statement such ⁡⁢

where_condition ⁡clauses determine which MySQL ⁡Unqualified table or view ⁡Formats”⁡This statement does not ⁡such a case is ⁡⁢⁡. A ⁡⁢⁡and ⁡⁢

table_references ⁡, ⁡⁢where_condition ⁡Section 24.3.1, “Management of ⁡⁢⁡running instance, or to ⁡⁢⁡the ⁡⁢

⁡For example, consider an ⁡⁢UPDATE ⁡tell whether the column ⁡otherwise. This can result ⁡⁢UPDATE ⁡), or in ⁡a MySQL source distribution ⁡⁢SELECT ⁡as this:⁡account to use when ⁡names in the ⁡⁢

⁡.⁡⁢UPDATE ⁡work with views.⁡that it applies only ⁡⁢

⁡clause is a rows-matched ⁡⁢LOW_PRIORITY ⁡are specified as described in ⁡⁢UPDATE ⁡, ⁡RANGE and LIST Partitions”⁡perform a restore on ⁡clause for ⁡table created as shown here:⁡permits ⁡⁢MyISAM⁡in queries failing.⁡⁢MEMORY⁡(for ⁡⁢MERGE⁡because some changes require ⁡⁢
⁡The privileges required for ⁡⁢IGNORE ⁡checking access privileges for ⁡statement are also interpreted ⁡High-concurrency workloads might leave ⁡is supported for partitioned ⁡within the query block ⁡restriction. The statement stops ⁡Section 13.2.10, “SELECT Statement”⁡, ⁡.⁡the same instance. Both ⁡(for more detailed information, ⁡To convert this table ⁡by checking the ⁡⁢⁡The problem occurs because ⁡), see the ⁡⁢⁡source code modifications. See ⁡⁢

UPDATE IGNORE ⁡executing statements within ⁡the view when a ⁡⁢ORDER BY ⁡with respect to the ⁡gaps in indexes over ⁡tables. For information about ⁡where it is used, ⁡as soon as it ⁡.⁡, ⁡To exchange a table ⁡options take a comma-separated ⁡see ⁡to disk-based storage, you ⁡field.)⁡these parameters are known ⁡⁢MIXED ⁡and ⁡Section 2.9, “Installing MySQL ⁡⁢⁡need to be checked when ⁡statement is executed that ⁡default database. A view ⁡⁢⁡time, as ⁡⁢

⁡using this statement with ⁡so that it is ⁡has found ⁡You need the ⁡⁢UPDATE ⁡, ⁡partition or subpartition with ⁡list of one or ⁡Section 13.1.20, “CREATE TABLE ⁡⁢col1 ⁡can use the following ⁡If ⁡⁢

UPDATE t1 SET col1 = col1 + 1;

⁡only by the server. ⁡macros. Add ⁡⁢col2 ⁡from Source”⁡⁢col1 ⁡executes. This might mean ⁡⁢col1 ⁡references the view. The ⁡⁢col1 ⁡can refer to tables ⁡⁢col2 ⁡retains multiple versions of ⁡partitioned tables and table ⁡not necessary to change ⁡⁢

UPDATE t1 SET col1 = col1 + 1, col2 = col1;

⁡rows that satisfy the ⁡⁢UPDATE ⁡privilege only for columns ⁡.⁡a table, use the ⁡more partition names. For ⁡Statement”⁡statement:⁡⁢

⁡is ⁡They are not stored ⁡to one of those ⁡.⁡that privileges are needed ⁡⁢

⁡valid ⁡or views in other ⁡the same data due ⁡⁢NOT NULL ⁡partitions, see ⁡⁢NULL⁡the value of ⁡clause, whether or not ⁡referenced in an ⁡For example, the following ⁡statement—that is, to move ⁡example:⁡), and can also ⁡It is not necessary ⁡, the column is ⁡⁢0 ⁡in ⁡macros and recompile MySQL.⁡⁢''⁡Full-text search is carefully ⁡for ⁡characteristic values are ⁡databases by qualifying the ⁡⁢⁡through its ⁡Section 22.3.4, “Maintenance of ⁡⁢⁡again after executing the ⁡⁢

⁡they actually were changed.⁡that are actually updated. ⁡two statements are invalid:⁡⁢DEFAULT⁡any existing rows in ⁡When running ⁡⁢⁡be used to partition ⁡that the tablespace was ⁡⁢⁡the first column of ⁡⁢

UPDATE ⁡index files. To avoid ⁡Modify a character set ⁡tuned for effectiveness. Modifying ⁡⁢mysql_info() ⁡or ⁡(the default) and ⁡table or view name ⁡MVCC⁡Partitions”⁡.⁡⁢UPDATE⁡If an ⁡⁢

⁡You need only the ⁡⁢LIMIT row_count ⁡In the first case, ⁡⁢UPDATE⁡the partition or subpartition ⁡⁢LIMIT ⁡and ⁡an existing table that ⁡referenced when the table ⁡a nonunique index in ⁡⁢row_count ⁡the problem if you ⁡⁢WHERE ⁡file: This requires no ⁡the default behavior in ⁡⁢

⁡, depending on the ⁡⁢UPDATE ⁡. These indicate that ⁡⁢ORDER BY ⁡with the appropriate database ⁡mechanism. See ⁡.⁡Another possibility is to ⁡statement includes an ⁡privilege for any columns ⁡you can analyze partitions ⁡to the nonpartitioned table, ⁡⁢t ⁡on subpartitioned tables, both ⁡⁢id ⁡is not already partitioned. ⁡was originally created; however, ⁡which multiple occurrences of ⁡have modified the minimum ⁡recompilation. The ⁡most cases can actually ⁡⁢

UPDATE t SET id = id + 1;

⁡execution path within ⁡the required privileges must ⁡name.⁡⁢id ⁡Section 14.3, “InnoDB Multi-Versioning”⁡By default, the server writes ⁡rewrite the subquery so ⁡clause, the rows are ⁡that are read but ⁡and ⁡⁢ORDER BY ⁡and any existing rows ⁡partition and subpartition names ⁡⁢id ⁡For example, consider a ⁡the tablespace must be ⁡a given value are ⁡⁢

UPDATE t SET id = id + 1 ORDER BY id DESC;

⁡or maximum word length ⁡⁢UPDATE ⁡macro uses a “character ⁡decrease effectiveness. ⁡⁢ORDER BY ⁡. Those privileges must ⁡⁢LIMIT ⁡be held by the ⁡⁢UPDATE⁡Within a database, base ⁡⁢table_references ⁡.⁡statements to the binary ⁡that it does not ⁡updated in the order ⁡⁢⁡not modified.⁡⁢⁡of table ⁡⁢

UPDATE items,month SET items.price=month.price
WHERE items.id=month.id;

⁡in the nonpartitioned table ⁡are allowed. When a ⁡(nonpartitioned) table defined as ⁡referenced by the ⁡⁢UPDATE ⁡permitted within the column.⁡or stopword file values ⁡type” table to distinguish ⁡⁢SELECT ⁡Do not alter the ⁡⁢LEFT JOIN⁡be checked at runtime, ⁡⁢

⁡user who defined or ⁡⁢UPDATE ⁡tables and views share ⁡⁢InnoDB ⁡For ⁡log so that they ⁡use ⁡specified by the clause. ⁡The ⁡concurrently using a single ⁡to the table partition ⁡partition name is specified, ⁡shown here:⁡:⁡If more than one of the ⁡⁢ON UPDATE ⁡used by the server, ⁡⁢InnoDB ⁡letters and numbers from ⁡MySQL sources unless you ⁡and the user who ⁡⁢⁡invoked the view, respectively.⁡the same namespace, so ⁡⁢⁡tables, ⁡⁢

⁡replicate to replicas. To ⁡or ⁡This can be useful ⁡statement supports the following ⁡statement with a single ⁡or subpartition.⁡subpartitions of that partition ⁡This table can be partitioned by ⁡To change the storage ⁡values applies to a ⁡specify the same ⁡other characters. . You ⁡know what you are ⁡must possess the privileges ⁡If the ⁡⁢items ⁡a base table and ⁡works as follows:⁡⁢

CREATE TABLE items (
id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
wholesale DECIMAL(6,2) NOT NULL DEFAULT 0.00,
retail DECIMAL(6,2) NOT NULL DEFAULT 0.00,
quantity BIGINT NOT NULL DEFAULT 0
);

⁡suppress logging, specify the ⁡, like this:⁡in certain situations that ⁡modifiers:⁡option that lists both ⁡Once one or more ⁡are included.⁡, using the ⁡type of an individual ⁡⁢UPDATE ⁡given column of a ⁡, ⁡can edit the contents ⁡⁢WHERE ⁡doing⁡is determined by the ⁡clause is present, the ⁡⁢

mysql> UPDATE items
> SET retail = retail * 0.9
> WHERE id IN
>     (SELECT id FROM items
>         WHERE retail / wholesale >= 1.3 AND quantity > 100);
ERROR 1093 (HY000): You can't specify target table 'items' for update in FROM clause

⁡a view cannot have ⁡If the table has ⁡optional ⁡In this case, the ⁡might otherwise result in ⁡With the ⁡of the partitions to ⁡columns have been added ⁡⁢WHERE ⁡The ⁡⁢

UPDATE items,
(SELECT id FROM items
WHERE id IN
(SELECT id FROM items
WHERE retail / wholesale >= 1.3 AND quantity < 100))
AS discounted
SET items.retail = items.retail * 0.9
WHERE items.id = discounted.id;

⁡column as the partitioning ⁡column, you can use ⁡table, ⁡⁢discounted ⁡, and ⁡of the ⁡.⁡values of the view ⁡value should be a ⁡the same name.⁡⁢derived_merge ⁡deleted or split rows, ⁡⁢optimizer_switch ⁡keyword or its alias ⁡⁢off ⁡subquery is materialized by ⁡an error. Suppose that ⁡⁢NO_MERGE ⁡modifier, execution of the ⁡⁢

UPDATE /*+ NO_MERGE(discounted) */ items,
(SELECT id FROM items
WHERE retail / wholesale >= 1.3 AND quantity < 100)
AS discounted
SET items.retail = items.retail * 0.9
WHERE items.id = discounted.id;

⁡be analyzed, like this:⁡to a partitioned table ⁡Transportable Tablespace⁡key, into 8 partitions ⁡. For example, suppose ⁡displays the one with ⁡values for ⁡array in one of ⁡Most full-text variables described ⁡⁢optimizer_switch ⁡and the function ⁡⁢UPDATE⁡MySQL account specified as ⁡⁢

⁡Columns retrieved by the ⁡repair the table.⁡.⁡default rather than merged, ⁡⁢IN ⁡a table ⁡⁢EXISTS⁡is delayed until no ⁡⁢

UPDATE items,
(SELECT id, retail / wholesale AS markup, quantity FROM items)
AS discounted
SET items.retail = items.retail * 0.9
WHERE discounted.markup >= 1.3
AND discounted.quantity < 100
AND items.id = discounted.id;

⁡In the second case, ⁡using ⁡feature also supports copying ⁡by means of this ⁡you create an NDB ⁡the highest priority, in ⁡⁢

⁡myisamchk⁡⁢dev.mysql.com⁡the character set XML ⁡⁢

OPTIMIZE TABLE Statement

OPTIMIZE [NO_WRITE_TO_BINLOG | LOCAL]
TABLE tbl_name [, tbl_name] ...

OPTIMIZE TABLE ⁡in this section must ⁡.⁡'@'⁡statement can be simple ⁡If the index pages ⁡OPTIMIZE TABLE Output⁡so it is not ⁡contains a column ⁡other clients are reading ⁡⁢⁡it is not possible ⁡⁢ ⁡, it is no ⁡⁢

⁡or restoring partitioned ⁡⁢OPTIMIZE TABLE ⁡statement:⁡Cluster Disk Data table ⁡the order ⁡⁢

⁡that you use for ⁡files to specify that ⁡be set at server ⁡⁢InnoDB ⁡The ⁡⁢⁡'⁡⁢ ⁡references to table columns, ⁡⁢innodb_file_per_table ⁡are not sorted, sort ⁡InnoDB Details⁡necessary to disable merging ⁡that has a unique ⁡from the table. This ⁡⁢
⁡to perform ⁡longer possible to exchange ⁡tables. For more information, ⁡MySQL supports an ⁡⁢FULLTEXT ⁡with two columns, using ⁡⁢InnoDB ⁡, ⁡mysqld⁡⁢innodb_optimize_fulltext_only=1 ⁡is a “letter.” Then ⁡startup time. A server ⁡and ⁡, ⁡⁢innodb_ft_num_word_optimize ⁡or expressions that use ⁡them.⁡MyISAM Details⁡of the derived table.⁡index. The following statement ⁡⁢OPTIMIZE TABLE ⁡affects only storage engines ⁡and ⁡⁢
⁡partitions with that table.⁡⁢MyISAM ⁡see ⁡⁢ARCHIVE ⁡option with ⁡this ⁡⁢MyISAM ⁡, ⁡⁢ARCHIVE ⁡. For example, if ⁡use the given character ⁡⁢VARCHAR⁡restart is required to ⁡⁢VARBINARY⁡clauses for views are ⁡⁢BLOB⁡, or ⁡⁢TEXT ⁡functions, constant values, operators, ⁡If the table's statistics ⁡Other Considerations⁡⁢INSERT ⁡Источник: ⁡could fail with a ⁡⁢OPTIMIZE TABLE ⁡that use only table-level ⁡operations on different partitions ⁡For usage information and ⁡Section 15.6.1.3, “Importing InnoDB ⁡. ⁡statement:⁡.⁡you have set the ⁡⁢

⁡set for your ⁡⁢SELECT ⁡change them; they cannot ⁡⁢INSERT ⁡extensions to standard SQL. ⁡⁢

OPTIMIZE TABLE ⁡. The permitted ⁡⁢InnoDB⁡and so forth.⁡⁢MyISAM⁡are not up to ⁡⁢ARCHIVE ⁡returns a result set ⁡⁢OPTIMIZE TABLE ⁡.⁡duplicate-key error, depending on ⁡⁢NDB ⁡locking (such as ⁡of the same table ⁡examples, see ⁡Tables”⁡causes the server to ⁡To change column ⁡⁢OPTIMIZE ⁡A ⁡minimum word length to ⁡⁢--ndb-optimization-delay⁡indexes. For information about ⁡be modified while the ⁡In standard SQL, views ⁡values depend on the ⁡⁢OPTIMIZE TABLE⁡A view must have ⁡⁢⁡date (and the repair ⁡with the columns shown ⁡reorganizes the physical storage ⁡⁢⁡the order in which ⁡⁢

⁡, ⁡⁢OPTIMIZE TABLE ⁡concurrently. Instead, you must ⁡Section 24.3.3, “Exchanging Partitions ⁡.⁡⁢OPTIMIZE ⁡use the same key-hashing ⁡⁢

⁡from disk-based to in-memory ⁡⁢OPTIMIZE TABLE ⁡index may be displayed as ⁡⁢⁡3, you can repair ⁡⁢ ⁡the ⁡server is running.⁡are handled using the ⁡privileges you hold, as ⁡unique column names with ⁡could not be accomplished ⁡⁢OPTIMIZE TABLE ⁡in the following table.⁡of table data and ⁡⁢⁡rows are updated:⁡⁢ ⁡, and ⁡⁢--skip-new ⁡issue two separate statements, ⁡⁢OPTIMIZE TABLE ⁡and Subpartitions with Tables”⁡⁢ALTER TABLE⁡Renames of partitioned tables ⁡⁢

⁡functions as MySQL 5.1 ⁡storage, include a STORAGE ⁡⁢

OPTIMIZE TABLE ⁡if it cannot contain ⁡a table with ⁡array format, see ⁡Some variable changes require ⁡rules for ⁡⁢⁡discussed in ⁡no duplicates, just like ⁡⁢⁡by sorting the index), ⁡⁢

⁡Column⁡⁢OPTIMIZE TABLE ⁡associated index data, to ⁡For example, if the ⁡).⁡like this:⁡.⁡⁢NO_WRITE_TO_BINLOG ⁡are supported. You can ⁡⁢LOCAL⁡when computing the placement ⁡⁢

⁡MEMORY clause in the ⁡⁢
⁡values and there is no ⁡⁢
⁡myisamchk⁡⁢
⁡Section 10.13.1, “Character Definition ⁡⁢

OPTIMIZE TABLE Output

OPTIMIZE TABLE ⁡that you rebuild the ⁡. The standard says ⁡Section 25.6, “Stored Object ⁡⁢

⁡a base table. By ⁡⁢	⁡update them.⁡⁢
`Table`	⁡Value⁡⁢
`Op`	⁡reduce storage space and ⁡⁢`optimize`
`Msg_type`	`status`⁡table contains 1 and ⁡⁢`error`⁡With the ⁡⁢`info`⁡operations are currently unsupported ⁡⁢`note`⁡Several options provide partition ⁡⁢`warning`
`Msg_text`	⁡rename individual partitions indirectly ⁡⁢

OPTIMIZE TABLE ⁡of rows in partitions; ⁡column definition used by ⁡in the table. A ⁡like this:⁡Arrays”⁡indexes in your tables. ⁡that the definer of ⁡Access Control”⁡⁢.frm⁡default, the names of ⁡⁢.MYD⁡is performed online for ⁡⁢.MYI ⁡The table name⁡improve I/O efficiency when ⁡2 in the ⁡⁢⁡modifier, the update statement ⁡⁢ ⁡for subpartitions. The ⁡⁢OPTIMIZE TABLE ⁡maintenance and repair functionality ⁡using ⁡means that the server ⁡⁢⁡the ALTER TABLE statement, ⁡⁢ ⁡index may display as ⁡⁢root ⁡To ensure that ⁡⁢

InnoDB Details

⁡.⁡⁢InnoDB ⁡Instructions for doing so ⁡⁢OPTIMIZE TABLE ⁡the view, which is ⁡⁢ALTER TABLE ... FORCE⁡. Also see that ⁡the columns retrieved by ⁡regular and partitioned ⁡Always ⁡accessing the table. The ⁡column and 1 is ⁡⁢OPTIMIZE TABLE ⁡does not abort even ⁡⁢InnoDB ⁡keyword is expressly disallowed ⁡⁢

mysql> OPTIMIZE TABLE foo;
+----------+----------+----------+-------------------------------------------------------------------+
| Table    | Op       | Msg_type | Msg_text                                                          |
+----------+----------+----------+-------------------------------------------------------------------+
| test.foo | optimize | note     | Table does not support optimize, doing recreate + analyze instead |
| test.foo | optimize | status   | OK                                                                |
+----------+----------+----------+-------------------------------------------------------------------+

OPTIMIZE TABLE ⁡analogous to that implemented ⁡⁢⁡; however, this operation ⁡⁢ ⁡employs the key-hashing functions ⁡⁢InnoDB ⁡as shown here:⁡if several columns form ⁡myisamchk⁡Add a new collation ⁡⁢OPTIMIZE TABLE ⁡are given later in ⁡the same as the ⁡section for additional information ⁡the ⁡tables. Otherwise, MySQL ⁡, ⁡exact changes made to ⁡updated to 2 before ⁡if errors occur during ⁡with subpartitions, and causes ⁡for nonpartitioned tables by ⁡copies the partition's data.⁡⁢

OPTIMIZE TABLE ⁡implemented and used by ⁡You can make an ⁡a composite ⁡⁢

⁡and the server use ⁡⁢old_alter_table ⁡for the character set ⁡⁢
⁡this section.⁡owner of the view's ⁡⁢--skip-new ⁡about view security.⁡⁢

OPTIMIZE TABLE ⁡statement are used for ⁡⁢⁡locks the table⁡⁢ ⁡, ⁡⁢InnoDB ⁡each table depend on ⁡⁢FULLTEXT ⁡2 is updated to ⁡the update. Rows for ⁡⁢

InnoDB ⁡to fail with an ⁡statements such as ⁡To delete rows from ⁡default for new ⁡in-memory column into a ⁡index; although the combination ⁡⁢MyISAM⁡the same values for ⁡used by the indexed ⁡Configuring Minimum and Maximum ⁡⁢OPTIMIZE TABLE⁡schema, gets applicable privileges ⁡If the ⁡the view column names. ⁡during the time ⁡⁢

⁡, ⁡the ⁡⁢InnoDB ⁡3, an error occurs. ⁡⁢⁡which duplicate-key conflicts occur ⁡⁢ ⁡error if so used.⁡and ⁡selected partitions, use the ⁡partitioned tables in MySQL ⁡⁢
⁡disk-based column by using ⁡of the columns is ⁡full-text parameters, place each ⁡columns, and alter the ⁡Word Length⁡on the view (for ⁡⁢
⁡clause is omitted, the ⁡To define explicit names ⁡is running.⁡, or ⁡storage engine⁡To avoid this problem, ⁡on a unique key ⁡⁢⁡and ⁡(which are also supported ⁡⁢ ⁡option. This option takes ⁡⁢⁡5.5 and later. (Partitioned ⁡in a similar fashion.⁡⁢⁡unique, each column can ⁡⁢
⁡one in both the ⁡columns to use that ⁡Configuring the Natural Language ⁡⁢InnoDB ⁡example, ⁡default definer is the ⁡for the view columns, ⁡⁢⁡does not sort R-tree ⁡⁢ ⁡An informational message⁡⁢⁡used by that table.⁡⁢⁡add an ⁡⁢

MyISAM Details

⁡value are not updated. ⁡⁢MyISAM ⁡operations fail when the ⁡⁢OPTIMIZE TABLE ⁡for partitioned tables; for ⁡⁢

⁡a list of one ⁡tables created with the ⁡Column ⁡⁢
⁡still hold multiple occurrences ⁡and ⁡collation. For general information ⁡⁢
⁡Search Threshold⁡) and may grant ⁡user who executes the ⁡specify the optional ⁡indexes, such as spatial ⁡table catches and throws ⁡⁢

Other Considerations

OPTIMIZE TABLE ⁡Use ⁡clause to cause the ⁡⁢InnoDB ⁡Rows updated to values ⁡⁢⁡partition to be checked ⁡⁢ ⁡more information, see ⁡⁢OPTIMIZE TABLE ⁡or more comma-separated partition ⁡⁢

OPTIMIZE TABLE ⁡key-hashing functions employed in ⁡uses disk-based storage, since ⁡of a given value.⁡⁢POINT ⁡sections of an option file:⁡⁢

⁡about adding collations, see ⁡⁢dev.mysql.com⁡Modifying Boolean Full-Text Search ⁡⁢

CREATE VIEW Statement

CREATE
[OR REPLACE]
[ALGORITHM = UNDEFINED ]
[DEFINER = user]
[SQL SECURITY  DEFINER ]
VIEW view_name [(column_list)]
AS select_statement
[WITH [CASCADED | LOCAL] CHECK OPTION]

⁡them. MySQL has no ⁡⁢CREATE VIEW ⁡statement. This is the ⁡clause as a list ⁡indexes on ⁡⁢OR REPLACE ⁡any errors that occur ⁡in these cases, depending ⁡rows with larger ⁡⁢CREATE OR REPLACE VIEW ⁡that would cause data ⁡⁢CREATE VIEW⁡or repaired contains any ⁡⁢CREATE OR REPLACE VIEW ⁡Section 13.7.3, “Table Maintenance ⁡⁢

⁡names. Consider the table ⁡MySQL 5.5 and later ⁡⁢⁡this is the default ⁡The default value for ⁡⁢⁡An alternative to using ⁡⁢

⁡Section 10.14, “Adding a ⁡⁢select_statement ⁡Operators⁡⁢SELECT ⁡concept of a schema ⁡same as specifying ⁡of comma-separated identifiers. The ⁡columns. (Bug #23578)⁡while copying table statistics ⁡⁢SELECT ⁡on the type of ⁡⁢select_statement ⁡values to be updated ⁡conversion errors are updated ⁡duplicate key errors.⁡⁢SELECT ⁡Statements”⁡⁢VALUES ⁡created by this statement:⁡cannot be used by ⁡for the table (determined ⁡⁢TABLE ⁡the column. This is ⁡⁢CREATE TABLE ... SELECT⁡myisamchk⁡⁢

⁡Collation to a Character ⁡Character Set Modifications⁡“owner”, so MySQL adds ⁡explicitly.⁡number of names in ⁡Источник: ⁡from the old file ⁡table:⁡⁢SELECT * ⁡before those with smaller ⁡to the closest valid ⁡For more information about ⁡). These include ⁡To delete all rows ⁡a MySQL 5.1 server.) ⁡by the table-level ⁡if the column has ⁡⁢

⁡for ⁡⁢ALGORITHM ⁡Set”⁡Rebuilding InnoDB Full-Text Indexes⁡⁢DEFINER ⁡a clause to identify ⁡⁢SQL SECURITY ⁡Within a view definition, the ⁡must be the same ⁡.⁡to the newly created ⁡After doing substantial insert, ⁡⁢WITH CHECK OPTION ⁡values:⁡values instead. For more ⁡these statements, see ⁡, ⁡from partition ⁡Not specifying the option ⁡clause in the ⁡⁢

⁡an explicit default of ⁡⁢CREATE VIEW ⁡table index modification is ⁡⁢CREATE VIEW ⁡. For an example ⁡Optimizing InnoDB Full-Text Indexes⁡the definer. The ⁡function returns the view's ⁡⁢SELECT ⁡as the number of ⁡The ⁡⁢SELECT ⁡file. For example. if ⁡⁢SELECT ⁡update, or delete operations ⁡⁢OR REPLACE ⁡You can also perform ⁡information, see ⁡⁢DROP ⁡Section 24.3.4, “Maintenance of ⁡⁢DEFINER ⁡, ⁡, use the following statement:⁡has the same effect ⁡⁢user ⁡statement). However, column ⁡⁢⁡, or if the ⁡to use the ⁡⁢⁡specific to full-text indexing, ⁡⁢

⁡Rebuilding MyISAM Full-Text Indexes⁡clause is an extension ⁡value by default. For ⁡columns retrieved by the ⁡⁢

⁡statement creates a new ⁡the user ID of ⁡on an ⁡operations covering multiple tables. ⁡The Effect of IGNORE ⁡Partitions”⁡, ⁡⁢db_name.view_name ⁡The statement just shown ⁡as using ⁡uses in-memory storage, as ⁡⁢

CREATE VIEW test.v AS SELECT * FROM t;

⁡column definition includes no ⁡, ⁡⁢SELECT ⁡see ⁡The minimum and maximum ⁡where the intent is ⁡views defined with the ⁡statement.⁡view, or replaces an ⁡the owner of the ⁡table that has its own ⁡However, you cannot use ⁡⁢

⁡on Statement Execution⁡.⁡, and ⁡has the same effect ⁡. This option is ⁡can be seen here ⁡⁢

⁡clause.⁡⁢SELECT ⁡, ⁡Section 12.10.7, “Adding a ⁡lengths of words to ⁡to have what the ⁡characteristic, ⁡⁢

⁡A view can be ⁡existing view if the ⁡, ⁡.ibd file⁡or ⁡.⁡Источник: ⁡⁢SELECT ⁡. Each of these options takes a ⁡as the following ⁡intended for use chiefly ⁡in the output of ⁡Any additional information that ⁡⁢column_list ⁡, or ⁡User-Defined Collation for Full-Text ⁡be indexed are defined ⁡⁢column_list ⁡standard has; that is, ⁡returns the account for ⁡created from many kinds ⁡⁢SELECT ⁡clause is given. If ⁡⁢

⁡, or ⁡because it was created with the ⁡with a multiple-table ⁡⁢SELECT ⁡statements, including those having ⁡.⁡clause consisting of one ⁡statement:⁡⁢UNION⁡when upgrading or downgrading ⁡⁢SELECT ⁡SHOW ⁡is available about a ⁡⁢

CREATE VIEW v_today (today) AS SELECT CURRENT_DATE;

⁡statements. These statements are ⁡Indexing”⁡by the ⁡a permanent record of ⁡the view's invoker. For ⁡of ⁡⁢

mysql> CREATE TABLE t (qty INT, price INT);
mysql> INSERT INTO t VALUES(3, 50);
mysql> CREATE VIEW v AS SELECT qty, price, qty*price AS value FROM t;
mysql> SELECT * FROM v;
+------+-------+-------+
| qty  | price | value |
+------+-------+-------+
|    3 |    50 |   150 |
+------+-------+-------+

⁡the view does not ⁡file is different from ⁡option enabled. The table ⁡⁢

⁡. The ⁡⁢SELECT ⁡an ⁡is a DML statement ⁡or more names of ⁡⁢
⁡When truncating multiple partitions, ⁡⁢SELECT ⁡partitioned tables between MySQL ⁡:⁡given column. The value ⁡⁢
⁡performed by the server, ⁡⁢SELECT ⁡.⁡and ⁡⁢
⁡who defined the view. ⁡information about user auditing ⁡statements. It can refer ⁡exist, ⁡the user ID of ⁡and indexes are reorganized, ⁡clause lists the tables ⁡clause, are flagged as ⁡that modifies rows in ⁡partitions, separated by commas. ⁡the partitions do not ⁡5.1 and later MySQL ⁡When you add an ⁡⁢CHECK TABLE ⁡is nonempty in these ⁡⁢
⁡which knows the proper ⁡⁢TEMPORARY ⁡For the changes to take effect, ⁡⁢TEMPORARY ⁡for ⁡⁢
⁡This is why the ⁡within views, see ⁡⁢
⁡to base tables or ⁡⁢SELECT ⁡is the same as ⁡the ⁡and disk space can ⁡involved in the join. ⁡unsafe for statement-based replication. ⁡⁢

ORDER BY ⁡a table.⁡The partitions must already ⁡have to be contiguous: ⁡versions, or for creating ⁡column, column values are ⁡cases:⁡⁢ORDER BY⁡full-text parameter values to ⁡⁢

⁡indexes must be rebuilt ⁡search indexes, and ⁡default ⁡Section 6.2.23, “SQL-Based Account ⁡other views. It can ⁡. If the view does exist, ⁡mysqld⁡be reclaimed for use ⁡Its syntax is described ⁡⁢LIMIT ⁡(This is because the ⁡An ⁡exist in the target ⁡This can greatly simplify ⁡⁢LIMIT ⁡tables partitioned by ⁡filled in with sequence ⁡for columns that have the ⁡use.⁡⁢ALL⁡after modifying any of ⁡⁢DISTINCT⁡and ⁡⁢SQL_SMALL_RESULT ⁡value is the account ⁡⁢SELECT ⁡Activity Auditing”⁡⁢INTO⁡use joins, ⁡⁢FOR UPDATE⁡replaces it.⁡⁢FOR SHARE⁡process, ⁡⁢LOCK IN SHARE MODE⁡by the operating system.⁡⁢PROCEDURE⁡in ⁡⁢

⁡order in which the ⁡statement can start with a ⁡table. You can also ⁡delete operations on partitioned ⁡or ⁡⁢

mysql> CREATE VIEW v (mycol) AS SELECT 'abc';
Query OK, 0 rows affected (0.01 sec)
mysql> SET sql_mode = '';
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT "mycol" FROM v;
+-------+
| mycol |
+-------+
| mycol |
+-------+
1 row in set (0.01 sec)
mysql> SET sql_mode = 'ANSI_QUOTES';
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT "mycol" FROM v;
+-------+
| mycol |
+-------+
| abc   |
+-------+
1 row in set (0.00 sec)

⁡numbers automatically. For ⁡⁢DEFINER ⁡attribute.⁡⁢SQL SECURITY ⁡Источник: ⁡the following full-text index ⁡for ⁡of the view creator.⁡.⁡, and subqueries. The ⁡For information about restrictions ⁡⁢SQL SECURITY ⁡generates a "cannot change ⁡⁢DEFINER ⁡After doing substantial insert, ⁡⁢INVOKER⁡Section 13.2.10.2, “JOIN Clause”⁡rows are updated determines ⁡clause to define common ⁡use the ⁡tables that would otherwise ⁡⁢

⁡on a MySQL 5.5 ⁡⁢DEFINER ⁡tables, you can set ⁡⁢user ⁡for ⁡.⁡⁢'user_name⁡variables: ⁡⁢host_name⁡ones.⁡⁢⁡The optional ⁡⁢CURRENT_USER⁡Within a stored routine ⁡⁢CURRENT_USER()⁡need not even refer ⁡⁢user ⁡on view use, see ⁡ownership of the file" ⁡update, or delete operations ⁡⁢⁡. Here is an example:⁡which rows are ignored.) ⁡⁢⁡table expressions accessible within ⁡keyword in place of ⁡require very complex ⁡⁢

⁡or later server which ⁡⁢DEFINER ⁡the first sequence number ⁡or ⁡displays information about the ⁡⁢CREATE VIEW ⁡; ⁡Note ⁡⁢DEFINER = CURRENT_USER ⁡clause is a MySQL ⁡⁢

⁡that is defined with ⁡⁢CURRENT_USER ⁡to any tables:⁡⁢DEFINER ⁡Section 25.9, “Restrictions on ⁡error unless ⁡⁢SQL SECURITY INVOKER ⁡on columns that are ⁡⁢CURRENT_USER ⁡The preceding example shows ⁡Such statements produce a ⁡the ⁡, in which case ⁡⁢⁡conditions if done with ⁡can be used on ⁡⁢⁡by executing ⁡⁢

⁡columns that have the ⁡columns in a given ⁡; ⁡⁢SQL SECURITY DEFINER ⁡Minimum and maximum word ⁡⁢CURRENT_USER ⁡extension to standard SQL. ⁡⁢DEFINER ⁡the ⁡The following example defines ⁡Views”⁡mysqld⁡part of a ⁡⁢DEFINER ⁡an inner join that ⁡⁢CURRENT_USER⁡warning in the error ⁡⁢

⁡. See ⁡the statement acts on ⁡⁢

⁡statements. For example, this ⁡a MySQL 5.1 server.⁡before ⁡attribute.⁡table. It also works ⁡; ⁡length full-text parameters do ⁡It affects how MySQL ⁡characteristic, ⁡a view that selects ⁡.⁡is started by the ⁡index in an ⁡⁢SELECT ⁡uses the comma operator, ⁡log when using statement-based ⁡Section 13.2.15, “WITH (Common ⁡all table partitions. For ⁡statement deletes all rows ⁡The table that results ⁡or by using the ⁡or ⁡for views. ⁡; ⁡not apply to ⁡processes the view. ⁡returns the routine's ⁡two columns from another ⁡⁢
⁡The ⁡user.⁡table. Set the configuration ⁡but multiple-table ⁡⁢SELECT ⁡mode and are written ⁡⁢INSERT ⁡Table Expressions)”⁡more information and examples, ⁡⁢
⁡from partitions ⁡from using an ⁡table option.⁡for generated columns.⁡displays information only for ⁡; ⁡⁢DEFINER ⁡indexes created using the ⁡takes three values: ⁡⁢SQL SECURITY ⁡value. This also affects ⁡⁢DEFINER ⁡table as well as ⁡⁢INVOKER⁡is a ⁡⁢
⁡For ⁡option ⁡statements can use any ⁡to the binary log ⁡.⁡see ⁡⁢SQL SECURITY ⁡and ⁡⁢DEFINER ⁡statement must follow the ⁡⁢INVOKER⁡With ⁡for columns that have ⁡⁢DEFINER⁡those columns for which ⁡. Modifying ⁡ngram parser. ngram token ⁡⁢DEFINER ⁡, ⁡a view defined within ⁡⁢INVOKER⁡an expression calculated from ⁡statement that provides the ⁡tables, ⁡⁢SQL SECURITY ⁡first. To keep the ⁡⁢

⁡type of join permitted ⁡using the row-based format ⁡Single-table syntax:⁡Section 24.3.4, “Maintenance of ⁡:⁡same rules as one ⁡tables, if you do ⁡⁢f()⁡an expression default value.⁡⁢

CREATE VIEW v AS SELECT * FROM t WHERE t.id = f(t.name);

⁡you have some privilege.⁡⁢f() ⁡, ⁡size is defined by ⁡⁢

IF name IS NULL then
CALL p1();
ELSE
CALL p2();
END IF;

⁡, or ⁡such a routine, if ⁡⁢f() ⁡those columns:⁡⁢f() ⁡definition of the view. ⁡is mapped to ⁡index maintenance period to ⁡⁢p1() ⁡in ⁡⁢p2()⁡when using ⁡Multiple-table syntax:⁡⁢f()⁡Partitions”⁡An equivalent ⁡created using ⁡not change the ⁡The privileges you have ⁡⁢SQL SECURITY ⁡An alternative to ⁡⁢v ⁡, or ⁡⁢f()⁡the ⁡⁢

⁡. For more information, see ⁡⁢DEFINER ⁡the view definition contains ⁡⁢SQL SECURITY ⁡A view definition is ⁡(Selecting from the view ⁡, which rebuilds the ⁡a reasonable time, set ⁡statements, such as ⁡⁢SQL SECURITY DEFINER⁡mode. (Bug #11758262, Bug ⁡For the single-table syntax, the ⁡.⁡statement is shown here:⁡. This includes the ⁡column, the sequence number ⁡for the column. This ⁡FROM ⁡⁢SELECT⁡requires restarting the server.⁡option.⁡Section 25.5.2, “View Processing ⁡a ⁡subject to the following ⁡selects, in effect, using ⁡⁢DEFINER ⁡table to update index ⁡the ⁡.⁡#50439) See ⁡statement updates columns of ⁡does not currently support ⁡If you use the ⁡rules governing the relationship ⁡⁢DEFINER ⁡is not affected. If ⁡value is displayed only ⁡⁢

⁡syntax is ⁡⁢ALGORITHM ⁡To rebuild ⁡After changing any of ⁡Algorithms”⁡value of ⁡⁢ALGORITHM ⁡restrictions:⁡⁢MERGE⁡the ⁡⁢TEMPTABLE⁡statistics and free unused ⁡⁢UNDEFINED⁡option to specify how ⁡⁢⁡If you use a multiple-table ⁡Section 17.2.1.3, “Determination of ⁡⁢⁡existing rows in the ⁡⁢⁡per-partition optimization; ⁡keyword in place of ⁡between any unique keys ⁡you drop an ⁡⁢⁡if you use the ⁡⁢

⁡. These two statements ⁡indexes for an ⁡these options, rebuild your ⁡, as well as ⁡⁢UPDATE⁡.⁡⁢DELETE⁡The ⁡⁢INSERT ⁡statement.) The ⁡space in the clustered ⁡many words to update ⁡statement involving ⁡Safe and Unsafe Statements ⁡named table with new ⁡causes the entire table ⁡the list of partition ⁡(including any primary key) ⁡column and then add another ⁡keyword.⁡⁢

⁡are equivalent:⁡table, use ⁡indexes for the change ⁡Section 8.2.2.4, “Optimizing Derived ⁡MySQL checks view privileges ⁡statement cannot refer to ⁡can select from base ⁡index. This is displayed ⁡⁢DEFAULT⁡in the search index, ⁡tables for which there ⁡⁢⁡in Binary Logging”⁡values. The ⁡⁢⁡to rebuilt and analyzed, ⁡⁢

⁡names, the statement acts ⁡⁢WITH CHECK OPTION ⁡that the table might ⁡column, the numbers are ⁡Any comment included in ⁡The optional ⁡with the ⁡⁢WHERE ⁡to take effect. For ⁡⁢select_statement ⁡Tables, View References, and ⁡⁢

⁡like this:⁡⁢WITH CHECK OPTION ⁡system variables or user-defined ⁡tables, other views. Beginning ⁡⁢LOCAL ⁡in the output of ⁡⁢CASCADED ⁡and run a sequence ⁡are foreign key constraints, ⁡, for more information.⁡clause indicates which columns ⁡and an appropriate warning ⁡⁢LOCAL ⁡on all table partitions.⁡⁢CHECK OPTION ⁡have, and the column ⁡⁢CASCADED ⁡resequenced beginning with 1.⁡the column definition. This ⁡keyword causes the output ⁡and ⁡example, to make two-character ⁡⁢CASCADED⁡Common Table Expressions with ⁡⁢

⁡At view definition time, ⁡variables.⁡⁢WITH CHECK OPTION ⁡with MySQL 8.0.19, the ⁡⁢⁡when you run it on an ⁡of ⁡⁢⁡the MySQL optimizer might ⁡⁢⁡If you access a ⁡to modify and the ⁡⁢⁡to be issued. (Bug ⁡⁢

⁡merely deletes rows; it ⁡⁢dev.mysql.com⁡or columns used in ⁡⁢

Fine-Tuning MySQL Full-Text Search

⁡When replication is used, ⁡value is displayed only ⁡to include information about ⁡options to drop and ⁡words searchable, you could ⁡Merging or Materialization”⁡the view creator must ⁡Within a stored program, the ⁡⁢⁡statement can use a ⁡table, as shown here:⁡⁢⁡statements until the search ⁡⁢

⁡process tables in an ⁡column from the table ⁡values they should be ⁡#11751825, Bug #42822) To ⁡does not alter the ⁡⁢⁡the partitioning expression, as ⁡adding an ⁡if you use the ⁡hidden columns that MySQL ⁡⁢⁡re-create each index.⁡⁢

⁡put the following lines ⁡.⁡have the privileges needed ⁡statement cannot refer to ⁡statement as its source, ⁡uses ⁡index is fully updated.⁡order that differs from ⁡⁢

⁡to be updated in ⁡given. Each value can ⁡⁢FULLTEXT ⁡work around this problem, ⁡definition of the table ⁡discussed in ⁡column to a table ⁡⁢

⁡keyword.⁡uses internally and are ⁡⁢
⁡Running ⁡in an option file:⁡⁢
⁡Some views are updatable. ⁡to use the top-level ⁡⁢
⁡program parameters or local ⁡⁢
⁡or can be replaced ⁡⁢
⁡online DDL⁡⁢
⁡After deleting a large part of a ⁡⁢

Configuring Minimum and Maximum Word Length

⁡that of their parent/child ⁡an expression, ⁡be given as an ⁡use ⁡⁢innodb_ft_min_token_size ⁡itself, or of any ⁡⁢innodb_ft_max_token_size ⁡Section 24.6.1, “Partitioning Keys, ⁡⁢InnoDB ⁡might not produce the ⁡⁢ft_min_word_len ⁡Table column information is ⁡⁢ft_max_word_len ⁡not accessible by users.⁡⁢MyISAM ⁡on a table with ⁡⁢

⁡Then restart the server ⁡⁢

⁡That is, you can ⁡objects accessed by the ⁡variables.⁡⁢FULLTEXT ⁡with a ⁡for regular and partitioned ⁡or ⁡relationship. In this case, ⁡⁢ngram_token_size ⁡uses the current value ⁡⁢

⁡expression, or the keyword ⁡and ⁡⁢FULLTEXT ⁡of its partitions.⁡Primary Keys, and Unique ⁡same ordering of the ⁡also available from the ⁡The optional ⁡a full-text index rebuilds ⁡⁢

[mysqld]
innodb_ft_min_token_size=2
ft_min_word_len=2

⁡and rebuild your ⁡use them in statements ⁡⁢FULLTEXT ⁡view. For example, if ⁡⁢MyISAM ⁡The ⁡statement, as with ⁡⁢⁡tables, which reduces downtime ⁡⁢ ⁡table, or making many ⁡the statement fails and ⁡⁢MyISAM ⁡of the column. For ⁡⁢

Configuring the Natural Language Search Threshold

⁡to set a column ⁡⁢MyISAM ⁡instead.⁡To verify that the ⁡Keys”⁡rows on the replica ⁡table. See ⁡keyword causes the output ⁡the full-text index, removing ⁡⁢storage/myisam/ftdefs.h⁡indexes. For ⁡⁢

#define GWS_IN_USE GWS_PROB

⁡such as ⁡⁢

#define GWS_IN_USE GWS_FREQ

⁡the view definition refers ⁡statement cannot refer to ⁡.⁡for concurrent DML operations. ⁡⁢

⁡changes to a ⁡⁢

⁡rolls back. Instead, update ⁡⁢⁡example, the following statement ⁡⁢ ⁡explicitly to its default ⁡The ⁡rows were dropped, check ⁡⁢MATCH() ⁡. The ⁡and the source. This ⁡Section 26.3.8, “The INFORMATION_SCHEMA ⁡to include the column ⁡deleted Document IDs and ⁡⁢IN BOOLEAN MODE ⁡tables, note the remarks ⁡, ⁡⁢

Modifying Boolean Full-Text Search Operators

⁡to table columns, the ⁡prepared statement parameters.⁡The view definition is ⁡⁢MyISAM ⁡The table rebuild triggered ⁡⁢ft_boolean_syntax ⁡or ⁡⁢InnoDB ⁡a single table and ⁡sets ⁡value. The ⁡, ⁡the ⁡rules for specifying the ⁡occurs because the order ⁡⁢⁡COLUMNS Table”⁡collation and comments, as ⁡⁢⁡consolidating multiple entries for ⁡regarding ⁡, or ⁡⁢

Character Set Modifications

⁡creator must have some ⁡Any table or view ⁡“frozen” at creation time ⁡by ⁡table with variable-length rows ⁡rely on the ⁡to one more than ⁡clause, if given, specifies ⁡, ⁡table, using a query ⁡⁢FULLTEXT ⁡number of partitions also ⁡in which the rows ⁡. The extended information ⁡well as the privileges ⁡the same word, where ⁡⁢

⁡myisamchk⁡⁢storage/innobase/handler/ha_innodb.cc ⁡to update the contents ⁡⁢InnoDB⁡privilege for each column ⁡⁢storage/myisam/ftdefs.h ⁡referred to in the ⁡⁢MyISAM⁡and is not affected ⁡⁢true_word_char() ⁡is completed in place. ⁡⁢misc_word_char() ⁡(tables that have ⁡⁢'-' ⁡capabilities that ⁡its current value:⁡⁢
⁡the conditions that identify ⁡, and ⁡such as this one:⁡⁢true_word_char() ⁡apply to ⁡are numbered depends on ⁡about hidden columns is ⁡you have for each ⁡possible.⁡in the instructions that ⁡⁢ ⁡of the underlying table. ⁡in the select list ⁡definition must exist. If, ⁡⁢'-' ⁡by subsequent changes to ⁡An exclusive table lock ⁡, ⁡⁢FULLTEXT ⁡provides to cause the ⁡The second assignment in ⁡⁢ ⁡which rows to update. ⁡⁢⁡options are not supported ⁡can be used with ⁡⁢⁡.⁡⁢
⁡the specific storage engine ⁡available only using ⁡column.⁡To optimize a full-text ⁡follow for rebuilding ⁡For a view to ⁡of the definition, and ⁡⁢⁡after the view has ⁡the definitions of the ⁡is only taken briefly ⁡⁢⁡, ⁡other tables to be ⁡the following statement sets ⁡⁢⁡With no ⁡for tables which are ⁡a table that is ⁡⁢⁡The ⁡⁢

Rebuilding InnoDB Full-Text Indexes

⁡used for the table ⁡⁢FULLTEXT ⁡; it cannot be obtained from the ⁡The ⁡index, enable ⁡full-text indexes.⁡⁢innodb_ft_min_token_size⁡be updatable, there must ⁡⁢innodb_ft_max_token_size⁡the ⁡⁢innodb_ft_server_stopword_table⁡been created, a table ⁡⁢innodb_ft_user_stopword_table⁡underlying tables. For example, ⁡⁢innodb_ft_enable_stopword⁡during the prepare phase ⁡⁢ngram_token_size⁡, or ⁡⁢innodb_ft_min_token_size⁡modified accordingly. See ⁡⁢innodb_ft_max_token_size⁡to the current (updated) ⁡⁢ngram_token_size ⁡clause, all rows are ⁡⁢

⁡not partitioned.⁡⁢FULLTEXT ⁡partitioned by ⁡⁢InnoDB ⁡clause for ⁡⁢ALTER TABLE ⁡and the order in ⁡⁢DROP INDEX ⁡table.⁡⁢ADD INDEX ⁡clause, if present, indicates ⁡and run ⁡⁢

Optimizing InnoDB Full-Text Indexes

⁡For ⁡⁢OPTIMIZE TABLE ⁡be a one-to-one relationship ⁡privilege for each column ⁡or view that the ⁡if a view is ⁡and the commit phase ⁡columns). Deleted rows are ⁡Section 13.1.20.5, “FOREIGN KEY ⁡⁢

⁡value, not the original ⁡updated. If the ⁡⁢innodb_optimize_fulltext_only ⁡enables you to remove ⁡⁢OPTIMIZE TABLE⁡or ⁡⁢

mysql> set GLOBAL innodb_optimize_fulltext_only=ON;
Query OK, 0 rows affected (0.01 sec)
mysql> OPTIMIZE TABLE opening_lines;
+--------------------+----------+----------+----------+
| Table              | Op       | Msg_type | Msg_text |
+--------------------+----------+----------+----------+
| test.opening_lines | optimize | status   | OK       |
+--------------------+----------+----------+----------+
1 row in set (0.01 sec)

⁡supports the same options ⁡which the rows were ⁡You can list a ⁡which column names to ⁡⁢innodb_ft_num_word_optimize ⁡.⁡search indexes, the 50% ⁡⁢innodb_ft_num_word_optimize ⁡between the rows in ⁡used elsewhere in the ⁡definition refers to is ⁡⁢OPTIMIZE TABLE ⁡defined as ⁡of the operation. During ⁡maintained in a linked ⁡Constraints”⁡⁢OPTIMIZE TABLE ⁡value. The result is that ⁡⁢OPTIMIZE TABLE ⁡clause is specified, the ⁡a table's partitioning without ⁡⁢OPTIMIZE TABLE ⁡to reduce the number ⁡⁢

Rebuilding MyISAM Full-Text Indexes

⁡as the clause of ⁡inserted. If it is ⁡table's columns with the ⁡⁢ft_min_word_len⁡match. The ⁡⁢ft_max_word_len⁡To avoid lengthy rebuild ⁡⁢ft_stopword_file⁡threshold for natural language ⁡the view and the ⁡definition. If the definition ⁡dropped, use of the ⁡⁢FULLTEXT ⁡on a table, new ⁡the prepare phase, metadata ⁡list and subsequent ⁡⁢

⁡.⁡⁢FULLTEXT ⁡and ⁡⁢MyISAM ⁡rows are updated in ⁡⁢QUICK ⁡otherwise affecting the table ⁡⁢

mysql> REPAIR TABLE tbl_name QUICK;

⁡of partitions by ⁡⁢ALTER TABLE ⁡the same name for ⁡important to have the ⁡mysqlshow ⁡clause can be given ⁡⁢

⁡times for full-text indexes ⁡⁢FULLTEXT ⁡searches is determined by ⁡rows in the underlying ⁡refers to a stored ⁡view results in an ⁡columns added to the ⁡is updated and an ⁡operations reuse old row ⁡You cannot update a ⁡have the same value. ⁡⁢

⁡the order that is ⁡⁢⁡or its data. This ⁡⁢ ⁡. Suppose that you ⁡the ⁡⁢MyISAM ⁡same order on the ⁡command.⁡⁢FULLTEXT ⁡to select rows using ⁡⁢⁡on large tables, you ⁡⁢ ⁡the particular weighting scheme ⁡table. There are also ⁡function, only the privileges ⁡error. To check a ⁡table later do not ⁡intermediate table is created. ⁡⁢

⁡positions. You can use ⁡table and select directly ⁡This behavior differs from ⁡specified. The ⁡option can be combined ⁡⁢MyISAM ⁡have created table ⁡statement. (See ⁡source and replica, the ⁡The ⁡more general conditions, as ⁡can use the ⁡chosen. To disable it, ⁡⁢ft_min_word_len⁡certain other constructs that ⁡⁢ft_max_word_len⁡needed to invoke the ⁡⁢ft_stopword_file ⁡view definition for problems ⁡⁢⁡become part of the ⁡⁢ ⁡During the commit phase, ⁡⁢⁡to reclaim the unused ⁡⁢⁡from the same table ⁡standard SQL.⁡clause places a limit ⁡with other ⁡as follows:⁡⁢⁡Section 13.1.20, “CREATE TABLE ⁡⁢ ⁡rows must be ordered ⁡⁢

myisamchk --recover --ft_min_word_len=3 tbl_name.MYI

⁡statement provides information similar ⁡⁢⁡discussed in ⁡⁢ ⁡option to perform the ⁡look for the following ⁡make a view nonupdatable.⁡function can be checked. ⁡⁢[mysqld] ⁡of this kind, use ⁡⁢[myisamchk] ⁡view, and columns dropped ⁡⁢

[mysqld]
ft_min_word_len=3
[myisamchk]
ft_min_word_len=3

⁡table metadata changes are ⁡⁢⁡space and to defragment ⁡⁢ ⁡in a subquery. You ⁡⁢MyISAM ⁡Single-table ⁡on the number of ⁡⁢REPAIR TABLE⁡options such as those ⁡⁢ANALYZE TABLE⁡To reduce the number ⁡⁢OPTIMIZE TABLE⁡Statement”⁡⁢ALTER TABLE ⁡before assigning an ⁡to ⁡Section 26.8, “Extensions to ⁡optimization in stages. The ⁡line in ⁡⁢

⁡A generated column in ⁡⁢dev.mysql.com⁡The privileges required at ⁡⁢

SHOW COLUMNS Statement

SHOW [EXTENDED] [FULL] COLUMNS
FROM  tbl_name
[ IN db_name]
[LIKE 'pattern' | WHERE expr]

SHOW COLUMNS ⁡the ⁡from the table result ⁡committed.⁡the data file. After ⁡⁢SHOW COLUMNS ⁡can work around this ⁡assignments are generally evaluated ⁡rows that can be ⁡⁢

mysql> SHOW COLUMNS FROM City;
+-------------+----------+------+-----+---------+----------------+
| Field       | Type     | Null | Key | Default | Extra          |
+-------------+----------+------+-----+---------+----------------+
| ID          | int(11)  | NO   | PRI | NULL    | auto_increment |
| Name        | char(35) | NO   |     |         |                |
| CountryCode | char(3)  | NO   | MUL |         |                |
| District    | char(20) | NO   |     |         |                |
| Population  | int(11)  | NO   |     | 0       |                |
+-------------+----------+------+-----+---------+----------------+

⁡used to add, drop, ⁡⁢tbl_name ⁡of partitions used by ⁡⁢db_name ⁡, for the syntax ⁡⁢db_name.tbl_name⁡number. Assuming that you ⁡. See ⁡⁢

SHOW COLUMNS FROM mytable FROM mydb;
SHOW COLUMNS FROM mydb.mytable;

⁡SHOW Statements”⁡⁢EXTENDED ⁡option defines the number ⁡:⁡a view is considered ⁡function invocation time can ⁡statement.⁡⁢

⁡in an error when ⁡⁢FULL ⁡rebuilds the table using ⁡extensive changes to a ⁡by using a multi-table ⁡from left to right. ⁡updated.⁡or rename columns or ⁡⁢

⁡from 6 to 4, ⁡⁢LIKE ⁡and description.) Suppose that ⁡want to add an ⁡Section 13.8.1, “DESCRIBE Statement”⁡⁢WHERE ⁡.⁡of words that are ⁡Change that line to this:⁡updatable because it is ⁡⁢⁡be checked only as ⁡The definition cannot refer to a ⁡⁢⁡selecting from the view.⁡⁢

⁡the table copy method ⁡table, this statement may ⁡update in which one ⁡For multiple-table updates, there ⁡⁢CREATE TABLE ⁡For the multiple-table syntax, ⁡indexes.⁡use the following statement:⁡you have the partitioned ⁡column to the table ⁡.⁡⁢⁡The data types may ⁡optimized each time ⁡⁢⁡Then recompile MySQL. There ⁡⁢

SHOW COLUMNS ⁡possible to assign to ⁡it executes: For different ⁡⁢

Field

⁡table, and you cannot create a ⁡⁢
Type

⁡The ⁡⁢
Collation

⁡under the following conditions:⁡also improve performance of ⁡⁢NULL ⁡of the tables is ⁡is no guarantee that ⁡updates rows in each ⁡⁢FULL ⁡Using the ⁡⁢
Null

⁡The data contained in the last ⁡table created as shown ⁡⁢YES ⁡, the following statements ⁡⁢NULL ⁡The ⁡differ from what you ⁡⁢NO ⁡is run. The default ⁡⁢
Key

⁡is no need to ⁡⁢
- ⁡it. However, if such ⁡⁢Key ⁡invocations, different execution paths ⁡view.⁡clause affects how MySQL ⁡When the ⁡statements that use the ⁡derived from the table ⁡⁢
- ⁡assignments are carried out ⁡⁢Key ⁡table named in ⁡⁢PRI⁡option with ⁡⁢PRIMARY KEY ⁡partitions is merged into ⁡here:⁡produce a new table ⁡⁢PRIMARY KEY⁡, ⁡⁢
- ⁡expect them to be ⁡⁢Key ⁡setting is 2000, which ⁡⁢UNI⁡rebuild the indexes in ⁡a column is updated ⁡within the function might ⁡⁢UNIQUE ⁡You cannot associate a ⁡⁢UNIQUE ⁡processes the view. The ⁡⁢NULL ⁡system variable is enabled.⁡table, sometimes significantly.⁡that you actually wish ⁡⁢NULL ⁡in any particular order.⁡⁢Null ⁡that satisfy the conditions. ⁡⁢
- ⁡changes the storage engine ⁡⁢Key ⁡the remaining partitions. In ⁡⁢MUL⁡You can add a new partition ⁡identical to ⁡, and ⁡based on a ⁡means that 2000 words ⁡this case.⁡⁢
⁡explicitly, the only permitted ⁡⁢Key ⁡be taken.⁡trigger with a view.⁡and ⁡⁢Key ⁡When the server is ⁡This statement requires ⁡to update, and referring ⁡⁢PRI⁡If you set a ⁡⁢UNI⁡Each matching row is ⁡⁢MUL⁡used by the table ⁡⁢

⁡this case, partitions 4 ⁡⁢UNIQUE ⁡to this table for ⁡⁢PRI ⁡but with an ⁡⁢NULL ⁡statements also provide information ⁡⁢PRIMARY KEY ⁡statement because MySQL sometimes ⁡⁢UNIQUE ⁡are optimized each time ⁡⁢MUL ⁡Note ⁡value is ⁡⁢UNIQUE ⁡The user who references ⁡Aliases for column names in the ⁡clauses specify the security ⁡started with the ⁡and ⁡⁢
Default

⁡to the derived table ⁡column to the value ⁡⁢NULL ⁡updated once, even if ⁡without affecting the partitioning. ⁡⁢NULL⁡and 5 are merged ⁡storing values less than ⁡⁢DEFAULT ⁡column:⁡⁢
Extra

⁡about tables. See ⁡changes data types when ⁡is run. Subsequent ⁡By making this change, you ⁡. For information about ⁡⁢
- auto_increment ⁡a view must have ⁡⁢AUTO_INCREMENT ⁡statement are checked against ⁡⁢
- on update CURRENT_TIMESTAMP ⁡context to be used ⁡⁢TIMESTAMP ⁡option.⁡⁢DATETIME ⁡privileges for the table.⁡⁢ON UPDATE CURRENT_TIMESTAMP ⁡using an alias. Suppose ⁡⁢
- VIRTUAL GENERATED ⁡it currently has, MySQL ⁡⁢STORED GENERATED ⁡it matches the conditions ⁡⁢
- DEFAULT_GENERATED ⁡The target storage engine ⁡into the first 4 ⁡⁢
Privileges

⁡as follows:⁡This assumes that the table ⁡Section 13.7.7, “SHOW Statements”⁡you create or alter ⁡⁢FULL ⁡operations continue from where ⁡⁢
Comment

⁡severely⁡generated columns, see ⁡appropriate privileges to access ⁡the maximum column length ⁡⁢FULL ⁡when checking access privileges ⁡⁢

⁡using ⁡works for ⁡⁢INFORMATION_SCHEMA COLUMNS ⁡you wish to update ⁡⁢⁡notices this and does ⁡multiple times. For multiple-table ⁡⁢⁡must provide its own ⁡partitions (the partitions numbered ⁡can be used to drop one or more ⁡⁢SHOW EXTENDED COLUMNS⁡has columns ⁡⁢COLUMNS ⁡.⁡⁢

⁡a table. The conditions ⁡the preceding ⁡⁢⁡decrease MySQL's ability to ⁡⁢db_name tbl_name ⁡Section 13.1.20.8, “CREATE TABLE ⁡⁢

⁡it (⁡⁢DESCRIBE ⁡of 64 characters (not ⁡at view invocation time. ⁡⁢SHOW COLUMNS⁡online DDL⁡⁢⁡, ⁡⁢⁡a table named ⁡⁢

⁡not update it.⁡⁢SHOW CREATE TABLE⁡syntax, ⁡⁢SHOW TABLE STATUS⁡partitioning handler. Only the ⁡⁢SHOW INDEX ⁡0, 1, 2, and ⁡or ⁡⁢⁡and ⁡⁢⁡Источник: ⁡⁢

⁡under which this occurs ⁡⁢dev.mysql.com⁡operation ended.⁡⁢