An introductory series that introduces the locking and transaction behavior of MySQL and compatible DBs, ``Part 1: Transaction Isolation Levels'' covers read committed and repeatable. A shared (s) lock permits the transaction that holds the lock to. This occurs if you change the transaction isolation level to read committed. In this situation, gap locks are disabled during searches and index scans, and the gap locks are disabled during searches and index scans.
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MySQL (innodb) has four transaction isolation levels, in order of looser locking: read uncommitted / read committed / repeatable read / serializable.
Compatible with MySQL In this tenth and final installment of the mysql introduction to db locking, I will explain how reading a lock behaves similar to read committed.
Regarding transaction isolation level for Sql:1992, the default innodb level is repeatable read. innodb uses the four transers listed in the SQL standard. Gap locks occur with mysql (innodb)'s default transaction isolation level of repeatable read. (Occursed when changing the isolation level to read committed.)
