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SQLServer误区30日谈第23天有关锁升级的误区 - 站长搜索
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SQLServer误区30日谈第23天有关锁升级的误区

数据库操作教程 2022-09-23 17:03:27 转载来源: 网络整理/侵权必删

误区#23:锁升级的过程是由行锁升级到页锁,再由页锁升级到表锁错误    实际不是,在SQLServer2005和之前的版本,页锁会直接升级到表锁。    在SQLServer2005或SQLServer2008,你可以通过如下跟踪标志改变锁升级的行为:标志1211-完全禁止锁升级,但锁使用的内存会被限制在动态分配内存的60%,当超过这个值时,更多的锁将会伴随着内存溢出错误而失败

误区 #23: 锁升级的过程是由行锁升级到页锁,再由页锁升级到表锁
错误
    实际不是,在SQL Server 2005和之前的版本,页锁会直接升级到表锁。
    在SQL Server 2005或SQL Server 2008,你可以通过如下跟踪标志改变锁升级的行为:

标志1211-完全禁止锁升级,但锁使用的内存会被限制在动态分配内存的60%,当超过这个值时,更多的锁将会伴随着内存溢出错误而失败。
  • 标志1224-禁止锁升级,但内存使用超过40%时,会自动开启锁升级
    如果标志1211和1224跟踪标志同时被设置了,只有标志1211会生效。更详细的内容请看Books Online

    在SQL Server 2008中,还可以以表为单位进行锁行为的设置,可以通过ALTER TABLE blah SET (LOCK_ESCALATION = XXX),在这个命令中XXX所代表的是下面几项中的一项:

TABLE: 直接从行锁升级到表锁。

  • AUTO:如果存在表分区,则升级为分区锁,但不会进一步升级。

  • DISABLE:禁用锁升级,这并不意味着禁用表锁,就像BOL(Books Online entry)中所说,在序列化隔离等级的条件下进行表扫描等操作时还需要表锁。

        在2008年1月的时候,我写了一篇包含分区锁例子的博文,请看:SQL Server 2008: Partition-level lock escalation details and examples
        或许你会想为什么LOCK_ESCALATION = XXX设置中AUTO不是默认值,这时因为早期测试中某些人发现这个选项更容易引起死锁。就像对于上述两个有关锁的跟踪标记一样,对于这个选项设置为AUTO也同样需要谨慎。

标签: 误区 SQLServer 30日 23天 有关 升级


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