ServerProcess
1.client进行update操作后,其他是怎么协作的? Client进行update操作之后,是由Server Process真正完成的,分下面几步: 1).需要更新的数据在Data buffer cache中直接更新该数据,如果需要更新的数据不在Data buffer cache中则先到Data files中把数据加载
1.client进行update操作后,其他是怎么协作的?
Client进行update操作之后,是由Server Process真正完成的,分下面几步:
1).需要更新的数据在Data buffer cache中直接更新该数据,如果需要更新的数据不在Data buffer cache中则先到Data files中把数据加载到Data buffer cache中再进行更新;
2).进行更新操作时需要对数据进行加锁;
3).把更新日志写入Redo log buffer;
4).再到Data buffer cache中写数据;
2.为什么要先到Redo log buffer中写更新日志再到Data buffer cache中写数据?
数据库的高可靠性与Redo log buffer有关。对数据库的所有操作都会记录日志,这样会放置数据丢失。因为写Redo log buffer特别快,一旦出现在写Data buffer cache断电情况下,数据库重启之后会根据Redo log buffer中的日志恢复到断电前状态继续写Data buffer cache数据。
3.Commit Processing操作介绍。
Commit Processing操作共分以下4部分:
1).Server Process通知Redo log buffer需要进行Commit操作;
2).LGWR把Redo log buffer中的内容刷新到Redo log files中;
3).Server Process通知User Process以完成commit操作;
4).Server Process释放数据锁;
4.auto commit会接收到一条数据进行一次commit操作,效率很低,并且会破坏事务的完整性,可能会出现数据丢失,不建议使用,最好是手工commit。
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