1846 (0A000): ALGORITHM=INPLACE is not supported.问题现象在RDS MySQL实例中,使用INPLACE方式扩展VARCHAR字段长度时,提示如下错误:ERROR 1846 (0A000):ALGORITHM=INPLACE is not suppor...
In MySQL 9.1, these can be resolved using GTID auto-positioning. The following options are available for CHANGE REPLICATION SOURCE TO statements: ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS = {OFF | LOCAL | uuid} Makes the replication channel assign a GTID to replicated transactions that do not ...
(Additionally there is one more transaction isolation level supported by MySQL/InnoDB, called SERIALIZABLE, but it is primarily a difference in locking, not transaction visibility, compared to REPEATABLE READ.) In the normal course of accessing an index, some small number of records will need to ...
pt语句: pt-online-schema-change --alter="add age varchar(10) NOT NUll DEFAULT '' COMMENT '性别' ;"--execute --print --max-lag=5D=test,t=users,u=root,p=123,S=/tmp/mysql.sock --no-check-replication-filters --max-load="Threads_running=100"--critical-load="Threads_running=120"--...
change buffer(在MySQL5.6 之前叫 insert buffer,简称 ibuf )是 InnoDB 5.5 引入的一种优化策略,若二级索引页不在 buffer pool 中,则将针对二级索引页的操作暂时缓存起来,等到该页从磁盘读到 buffer pool 中时再批量的(batch)apply 这些操作,从而达到减少磁盘 I/O 的目的。具体一点就是: ...
mysql_change_user()fails if the connected user cannot be authenticated or does not have permission to use the database. In this case, the user and database are not changed. Pass adbparameter ofNULLif you do not want to have a default database. ...
对于原表来说,若是能插入成功,那么在影子表中也能插入成功;在原表中插入不成功也就不会触发触发器的执行,也就是影子表不会有任何变化, 那么为什么原表的 INSERT 操作会触发影子表的 INPLACE 操作呢?这是因为在 MYSQL 中,REPLACE 操作也会触发 INSERT 触发器,所以这里触发器的动作若是改成 INSERT 操作,那么...
但是MySQL中对表进行ddl时,会锁表,当表记录数小于一万时,对前端影响较小,当时遇到千万级别的表 就会影响前端应用对表的写操作。 目前InnoDB引擎是通过以下步骤来进行DDL的: 1 按照原始表(original_table)的表结构和DDL语句,新建一个不可见的临时表(tmp_table) ...
change buffer(在 MySQL 5.6 之前叫 insert buffer,简称 ibuf )是 InnoDB 5.5 引入的一种优化策略,若二级索引页不在buffer pool 中,则将针对二级索引页的操作暂时缓存起来,等到该页从磁盘读到 buffer pool 中时再批量的(batch)apply 这些操作,从而达到减少磁盘 I/O 的目的。具体一点就是: 事务1 执行写操作(...
Bug #116625 The LOCK_TYPE in PFS.metadata_locks not change after MDL upgrade or downgrade Submitted: 12 Nov 2024 7:15Modified: 3 Dec 2024 10:44 Reporter: George Ma (OCA) Email Updates: Status: Closed Impact on me: None Category: MySQL Server: Performance SchemaSeverity: S3 (Non-...