事务处理时若发生错误，业务层未妥善处理，可能导致commit或rollback操作缺失；表分区方面，需预先创建和监控分区，以确保在适当的时候创建新分区并监控分区状态；数据库层元数据锁等待超时问题，若lock_wait_timeout设置过大，可能导致DDL操作阻塞时间过长，进而影响新业务；MySQL生态数据库在事务执行失败时，通常不会自...
You might still use multi-partALTER TABLEstatements for: Operations that must be performed in a specific sequence, such as creating an index followed by a foreign key constraint that uses that index. Operations all using the same specificLOCKclause, that you want to either succeed or fail as ...
• DROP SCHEMA, all entities in the schema are dropped, or none• Note that atomic DDL statements will be rolled back or committed even in case of crash, e.g. RENAME TABLES• CREATE TABLE would be successfully committed or rolled back (no orphan ibd left)• TRUNCATE TABLE (...
Written By Posted Undo the effects of DDL and DML statements in MySQL database Roshan Titus April 18, 2017 08:07AM Re: Undo the effects of DDL and DML statements in MySQL database Peter Brawley April 18, 2017 10:16AM Sorry, you can't reply to this topic. It has been closed....
MySQL 8.0.27 引入了 innodb_ddl_threads 变量来控制用于创建二级索引时的并行线程数量,此参数一般和一并引入的 innodb_ddl_buffer_size 一起使用,innodb_ddl_buffer_size 用于指定进行并行 DDL 操作时能够使用的 buffer 大小,buffer 是在所有的 DDL 并行线程中平均分配的,所以一般如果调大 innodb_ddl_threads ...
1 row in set (0.00 sec) WORK_COMPLETED表示已经完成的“工作量”,WORK_ESTIMATED表示预计的总工作量,所以评估 DDL 操作的进度的时候可以用两个指标来判断整体的进度。预估时间的时候,可以参考如下语句进行简单的估算: 代码语言:txt AI代码解释 mysql> SELECT EVENT_NAME, WORK_COMPLETED, WORK_ESTIMATED FROM per...
mysql> help KEYWORD mysql> help contents 演示: MariaDB[(none)]>helpcontents You askedforhelpabouthelpcategory:"Contents"Formoreinformation,type'help <item>', where<item>is one of the following categories: Account Management Administration Compound Statements ...
概述:Atomic DDL statements in MySQL 8?→Enable atomic DDL statements on MySQL 8+ 类型:Uncategorized→New feature 组件:Uncategorized→Migrations The documentation is currently correct, the feature is disabled for all versions of MySQL. Did you give a try at running the suite locally against MySQL ...
Thesubstantially from their default value of, the table is most likely locked between each operation, preventingstatements on the table.
• DROP SCHEMA, all entities in the schema are dropped, or none • Note that atomic DDL statements will be rolled back or committed even in case of crash, e.g. RENAME TABLES • CREATE TABLE would be successfully committed or rolled back (no orphan ibd left) ...