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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Reads consistency
In this section we will see which reads are consistent within a transaction, and how InnoDB guarantees this consistency. The consistency of queries is determined by the transaction level, by using the WITH CONSISTENT SNAPSHOT option for START TRANSACTION, and the LOCK IN SHARE MODE or FOR UPDATE options for SELECT. Augmenting the consistency of reads can be important to be sure that applications work properly, while relaxing it improves the concurrency.
The non-repeatable reads
A read is called non-repeatable if repeating the same query twice within the same transaction without modifying the data within the transaction returns different results. This happens because the current transaction is not fully isolated from changes requested ...
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