29+ Waiting For Table Metadata Lock

Your alter table query hasnt even started. First you should use show processlist to check whether there exists any.

Process Mysql Permanently Getting Waiting For Table Metadata Lock Stack Overflow

Useful Queries To check about all the locks transactions are waiting for.

. If there is an alter table maintenance task and it is run when unsupervised it is best to set the timeout time through lock_wait_timeout to avoid long waits for the metedata. Since a metadata lock wait has already occurred we need to follow the steps below to resolve it. This means that when a transaction including XA transactions uses a table it locks its metadata until the end of transaction.

We can use the following command to get necessary information in a tabular form showing where the Waiting for table metadata lock occurs. A table metadata lock is not a row level lock or table level lock it is a lock on a table that prevents tables structure. Yes its safe.

Mysql5710 出现waiting for table metadata lock. MariaDB supports metadata locking. 发现多个该表的查询进程的状态为waiting for table metadata lock巧的发现表被锁的同时正在对表进行DDL操作所以当.

However the waiting for table metadata lock means that theres another transaction operating on that table for a long. 出现Waiting for table metadata lock这种情况多半是和事务有关要么是一个长事务在运行要么是事务没有提交造成的. When any query DDL that alters the structure of the.

We can use INFORMATION_SCHEMA Tables. Metadata locks are extended as necessary to tables related by a foreign key constraint to prevent conflicting DML and DDL operations from executing concurrently on the.

1750 3000rpm Csdn