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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Metadata locks
Metadata locks are a particular type of lock that has been supported since MariaDB 5.5. Transactions acquire metadata locks when they access a table or view for the first time. This includes non-transactional tables such as Aria tables. Metadata locks prevent transactions from dropping the locked object or modifying the structure. This is very important because if a transaction is using a table, you want to be sure that the table columns (or even the whole table) will not disappear in the middle. In some cases, stored programs are also locked.
If a connection tries to execute a DDL statement (such as ALTER TABLE) on a table that has a metadata lock, the connection will be put on hold until the locks are released. However, metadata ...
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