在使用 xtrabackup 进行MySQL 数据库备份和恢复时,有时在恢复过程结束后,你可能会遇到这样的建议:“please run optimize table or alter table algorithm=copy on all”。这是因为在某些情况下,xtrabackup 恢复后的表可能不是最优状态,特别是当表使用了 InnoDB 存储引擎时。 为了优化这些表,你可以按照以下步骤操作...
OPTIMIZE TABLE 可以在线DDL,通过指定(ALGORITHM=INPLACE) ,不过这个只支持INNODB表,普通表和分区表都是支持的.表重建的方式有两种,OPTIMIZE TABLE 和 ALTER TABLE ... FORCE两种方式都可以触发表重建. OPTIMIZE TABLE 也有适用于 ALGORITHM=COPY的一些条件: 1:当old_alter_table参数设置为ON的时候,OPTIMIZE并不会重...
OPTIMIZE TABLE continues to use ALGORITHM=COPY under the following conditions: When the old_alter_table system variable is turned ON.set old_alter_table=on; //alter table 修改表采用 algorithm=copy 方式 When the mysqld --skip-new option is enabled....
In this case, OPTIMIZE TABLE is just mapped to ALTER TABLE. 1. OPTIMIZE TABLE continues to use ALGORITHM=COPY under the following conditions: When the old_alter_table system variable is turned ON. 1. 2. 3. set old_alter_table=on; //alter table 修改表采用 algorithm=copy 方式 When the ...
Optimize Table in InnoDB with ALGORITHM set to INPLACE Optimize Table in InnoDB with ALGORITHM set to NOCOPY Optimize Table in InnoDB with ALGORITHM set to INSTANT ↑ Optimizing Tables ↑ ANALYZE TABLE → Comments Content reproduced on this site is the property of its respective owners, and this...
Optimizing a table Yes* Yes Yes No Optimizing a table OPTIMIZE TABLE tbl_name; Performed in-place as of MySQL 5.6.17. In-place operation is not supported for tables with FULLTEXT indexes. The operation uses the INPLACE algorithm, but ALGORITHM and LOCK syntax is not permitted. About the ...
Note that these operations will continue to use table copy under any of the below conditions: a) ‘old_alter_table’ system variable is turned ON. b) ‘skip-new’ mysqld option is enabled and OPTIMIZE TABLE operation is performed. c) Algorithm ‘COPY’ is explicitly specified ...
AddMemberAlterRoleAction AddSearchPropertyListAction AddSensitivityClassificationStatement AddSignatureStatement AdHocDataSource AdHocTableReference AffinityKind AlgorithmKeyOption AllowConnectionsOptionKind AlterAction AlterApplicationRoleStatement AlterAssemblyStatement AlterAsymmetricKeyStatement AlterAuthorizatio...
-- Disable Vertical Merges ALTER TABLE test MODIFY SETTING enable_vertical_merge_algorithm = 0 Horizontal merge used by default, will use more memory if there are more than 80 columns in the table OPTIMIZE TABLE example FINAL DEDUPLICATE BY expr ...
TABLE, DISCARD/IMPORT TABLESPACE or TRUNCATE TABLE then allow multiple writers. Note that ALTER TABLE uses a TL_WRITE_ALLOW_READ < TL_WRITE_CONCURRENT_INSERT. We especially allow multiple writers if MySQL is at the start of a stored procedure call (SQLCOM_CALL) or a stored function call (...