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What Causes lock wait timeout MySQL?
The common causes are: The offensive transaction is not fast enough to commit or rollback the transaction within innodb_lock_wait_timeout duration. The offensive transaction is waiting for row lock to be released by another transaction.
How do I extend my server timeout?
Modifying Server Timeout Settings
- In ProjectWise Administrator, under the Servers node, right-click your server and select Properties.
- In the Server Properties dialog, select the Timeouts tab.
- In the Time Out field, adjust the length of time (in seconds) that the connection can be idle (default is 600 seconds).
What Causes Lock wait timeout MySQL?
How do you prevent database locking?
When an object is being accessed concurrently by multiple programs or users, consider increasing free space, causing fewer rows to be stored on a single page, at least until data is added. The fewer rows per page, the less intrusive page locking will be because fewer rows will be impacted by a page lock.
Why is the lock wait timeout exceeded error thrown?
When you establish a connection for a transaction, you acquire a lock before performing the transaction. If not able to acquire the lock, then you try for sometime. If lock is still not obtainable, then lock wait time exceeded error is thrown. Why you will not able to acquire a lock is that you are not closing the connection.
How to know if MySQL lock timeout is exceeded?
Now just take the value from trx_mysql_thread_id and send it the KILL command: If you’re unsure which transaction is yours, repeat the first query very often and see which transactions persist. After investigating the results above, you should be able to see what is locking what.
Is there rollback on lock wait timeout in InnoDB?
This is true for deadlock, but not for InnoDB lock wait timeout. Unless you set innodb_rollback_on_timeout=1 (default is 0 – disabled), automatic rollback is not going to happen for InnoDB lock wait timeout error.
What happens when row lock is not released?
The offensive transaction is waiting for row lock to be released by another transaction. The failed statement is not being rolled back by default. Even if innodb_rollback_on_timeout is enabled, when a statement fails in a transaction, ROLLBACK is still a more expensive operation than COMMIT.