September 2014
Intermediate to advanced
384 pages
9h 28m
English
Content preview from Mastering MariaDBBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Deadlocks
Some combinations of locks create a situation where some transactions block each other. Since all the involved transactions are waiting for a lock to be released, they will never unblock naturally. Such situations are called deadlocks. InnoDB (like other storage engines which need to deal with such situations) has an internal mechanism to detect deadlocks. It unblocks the situation by terminating the transaction that inserted, deleted, or updated the least number of rows. Such a transaction is called the victim.
Sometimes, a storage engine that uses table-level locks may be involved in a deadlock, which also involves InnoDB tables. In that case, InnoDB can only detect the deadlock if the innodb_table_locks server variable is ON.
In an ...
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