Mysql deadlock select12/6/2023 In this case, MySQL will detect the deadlock and choose one of the transactions as the victim, rolling it back to release the locks. To resolve this issue, you can try to optimize the transaction by reducing the number of queries or breaking it up into smaller transactions.ĭeadlocks: A deadlock occurs when two or more transactions are waiting for each other to release locks on the same resources. Long-running transactions: If a transaction is holding a lock on a table for an extended period of time, other queries that need to access the same table may be blocked. If MySQL is locking up InnoDB tables, it may be due to one of the following reasons: When a query is executed against an InnoDB table, MySQL may place a lock on the table or individual rows to prevent other queries from modifying the same data at the same time. MySQL uses a locking mechanism to manage concurrent access to InnoDB tables. So it appeared like the tables were locked. I had set PDO::ATTR_AUTOCOMMIT = false when I created the MYSQL connection (for some reasons I can't change), so I had to specifically run $db_connection_handle->query('COMMIT ') to specifically commit the transaction. It turns out this was a problem that was caused originally by the way I had PHP PDO for MySQL executing queries. Is there a way I can force INNODB to just restart/reboot or something i.e. I also can't add data to the other INNODB tables in the database. Then I used the XAMPP controller to stop mysql and then start it again, but that didn't work as the table just seems to be locked permanently. Mysql> KILL QUERY 17 ERROR 1317 (70100): Query execution was interruptedī. KILL QUERY 17 to which I got the following result: I logged into MySQL to look at the process list as below: mysql> SHOW PROCESSLIST \G However, MySQL seems to have locked up as I can't add anything to the table anymore. I was doing this using a simple PHP query with for loops. I was doing some performance testing on MySQL simulating adding 100 rows at a time. My environment is Windows 7 and I'm using XAMPP.
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