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
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...
mysql> SHOW TABLE STATUS LIKE clause; ★查看表结构定义: DESC tbl_name; ★查看表状态属性信息: SHOW TABLE STATUS [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] 演示: 1.表创建: [root@centos7 ~]# mysql -p134296Welcome to the MariaDB monitor. Commands end with;or\g. Your Mar...
• 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 (...
Thesubstantially from their default value of, the table is most likely locked between each operation, preventingstatements on the table.
Statements statements=CCJSqlParserUtil.parseStatements(sqlContent);for(Statement statement:statements.getStatements()){if(statementinstanceofCreateTable){String sql=ProcessSingleCreateTable.process((CreateTable)statement);totalSql.append(sql).append("\n");}elseif(statementinstanceofDrop){String sql=Process...
在上篇MySQL 5.7的分析中,我们是首先知道引发阻塞的线程ID,然后利用events_statements_history表,查看该线程的相关SQL。 而在MySQL 5.6中,我们并不知道引发阻塞的线程ID,但是,我们可以反其道而行之,利用穷举法,首先统计出所有线程在当前事务执行过的所有SQL,然后再判断这些SQL中是否包含目标表。
目前,只有InnoDB存储引擎⽀持原子DDL,为了实现原子DDL,Innodb要写DDL logs 到 mysql.innodb_ddl_log 表,这是一个隐藏在mysql.ibd 数据字典表空间⾥的数据字典表。要看mysql.innodb_ddl_log 中的内容,需要 SET GLOBAL LOG_ERROR_VERBOSITY=3;(MySQL 8.0 默认为2,error log 记录Errors and ...
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 ...
locks until the transaction ends. A metadata lock on a table prevents changes to the table’s structure. This locking approach has the implication that a table that is being used by a transaction within one session cannot be used in DDL statements by other sessions until the transaction ends....