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Why does MySQL hang when using TRUNCATE TABLE?
The TRUNCATE may hang, because other processes could use this table, so to check run in shell: Then kill the queries which are using it (change 123 to Id of the process): may also help to investigate any hangs. I faced same issue, and its resolved by restarting mysql server.
What to do if your truncate table gets stuck?
Rather than figuring out where in the plumbing of TRUNCATE TABLE it is getting stuck, you may just have to take matters into your own hands by replacing this This may just offline the problem (perhaps hanging on the DROP TABLE ), but the table becomes available quickly. DROP TABLE has been improved in MySQL 5.5.23.
How does the truncate function work in InnoDB?
Only with InnoDB table, InnoDB processes TRUNCATE TABLE by deleting rows one by one if there are any FOREIGN KEY constraints that reference the table. If there are no FOREIGN KEY constraints, InnoDB performs fast truncation by dropping the original table and creating an empty one with the same definition.
Can you use same values in TRUNCATE TABLE?
If you do no want to use same values, you can: You must remember that TRUNCATE TABLE is DDL not DML. Rather than figuring out where in the plumbing of TRUNCATE TABLE it is getting stuck, you may just have to take matters into your own hands by replacing this
Is it possible to truncate a corrupted InnoDB table?
Truncating a corrupted InnoDB table is supported. TRUNCATE TABLE is treated for purposes of binary logging and replication as DDL rather than DML, and is always logged as a statement. TRUNCATE TABLE for a table closes all handlers for the table that were opened with HANDLER OPEN.
Why does TRUNCATE TABLE cause InnoDB to stall?
Else the table have a lot of data, query becomes hang. The reason why you experience performance degradation or stall while executing TRUNCATE TABLE is a known issue with this statement. Please refer to Bug #68184:Truncate table causes innodb stalls.
Why is my truncate speed slower on my new DB?
This means that locks on those other tables could cause it to pause too. Differences in referential integrity checks: if your new DB has FKs defined referring to that table where the old one didn’t, that could also explain a difference in truncate speed.