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14.2.10. InnoDB Transaction Model and Locking

In the InnoDB transaction model, the goal is to combine the best properties of a multi-versioning database with traditional two-phase locking. InnoDB does locking on the row level and runs queries as non-locking consistent reads by default, in the style of Oracle. The lock table in InnoDB is stored so space-efficiently that lock escalation is not needed: Typically several users are allowed to lock every row in the database, or any random subset of the rows, without InnoDB running out of memory.


 
 
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