29+ Waiting For Table Metadata Lock

Web 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. Web Lock several tables in the DB Do its queries Send a message to chat with the results Unlock tables The message to the chat was sent via a socket with connection timeout of.

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When any query DDL that alters the structure.

. Web mysql5710 出现waiting for table metadata lock. Web 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. Web We can use the following command to get necessary information in a tabular form showing where the Waiting for table metadata lock occurs.

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. But all select queries are getting locked and we are observing Waiting for table metadata lock. Web We can use INFORMATION_SCHEMA Tables.

We have enabled slow query. Web Since a metadata lock wait has already occurred we need to follow the steps below to resolve it. Web We are using only select queries.

Useful Queries To check about all the locks transactions are waiting for. Web The Performance Schema metadata_locks table exposes metadata lock information which can be useful for seeing which sessions hold locks are blocked. Web Metadata locks are extended as necessary to tables related by a foreign key constraint to prevent conflicting DML and DDL operations from executing.

MariaDB supports metadata locking. First you should use show processlist to check whether there. This means that when a transaction including XA transactions uses a table it locks its metadata until the end of.

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