14.5 InnoDB Locking and Transaction Model InnoDB 锁和事务模型 14.5.1 InnoDB Locking 14.5.2 InnoDB Transaction Model 14.5.3 Locks Set by Different SQL Statements in InnoDB 14.5.4 Phantom Rows 14.5.5 Deadlocks in InnoDB 实现一个大规模的,繁忙的,或者可扩展的数据库应用,从不同数据库系统的大量代码…

官方文档 InnoDB implements standard row-level locking where there are two types of locks, shared (S) locks and exclusive (X) locks. A shared (S) lock permits the transaction that holds the lock to read a row. An exclusive (X) lock permits the transaction…

If one session has a shared or exclusive lock on record R in an index, another session cannot insert a new index record in the gap immediately before R in the index order. 如果一个session 有一个共享或者排它锁在记录R上,另外的session 不能插入新的index record 在before R这个区间 Sessio…

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Innodb中的锁 共享锁和排它锁(Shared and Exclusive Locks)共享锁和排它锁是行级锁,有两种类型的行级锁 共享锁(s lock)允许持有锁的事务对行进行读取操作 排它锁(x lock)允许持有锁的事务对行进行更新和删除操作 事务a在行r上拥有共享锁,则其他事务可以获得r的共享锁,无法获得r的排它锁,即可读不可写事务a在行r上拥有排它锁,则其他事务既不能获得共享锁,也不能获得排它锁,即不可读也不可写而必须等待当前事务完成 意向锁(Intention Locks) 意向锁…

14.3.3 Locks Set by Different SQL Statements in InnoDB 不同的SQL语句在InnoDB里的锁设置 locking read, 一个UPDATE,或者一个DELETE 通常设置record locks 在每个index record 它不关心 是否语句里的WHERE条件会排除记录 InnoDB 不记准确的WHERE 条件,只是知道哪个index ranges 会被扫描. 锁通常是next-key locks 会堵塞插入的区间.然而, gap l…

InnoDB has several types of record-level locks including record locks, gap locks, and next-key locks. For information about shared locks, exclusive locks, and intention locks, see Section 14.3.5.3, “InnoDB Lock Modes”. InnoDB有几种行级锁类型, 包括 record 锁, ga…

http://dev.mysql.com/doc/refman/5.0/en/innodb-record-level-locks.html InnoDB has several types of record-level locks including record locks, gap locks, and next-key locks. For information about shared locks, exclusive locks, and intention locks, see…

A locking read, an UPDATE, or a DELETE generally set record locks on every index record that is scanned in the processing of the SQL statement. It does not matter whether there are WHERE conditions in the statement that would exclude the row. InnoDB …

Innodb 锁类型: Shared and Exclusive Locks Intention Locks Record Locks Gap Locks Next-Key Locks Insert Intention Locks AUTO-INC Locks Predicate Locks for Spatial Indexes 说明:本文中如无特殊说明,默认为innodb引擎,事务隔离级别为RR. Shared and Exclusive Locks innodb 可以通过两种方式实现行级锁…