Oracle Process Summary
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Oracle进程基本结构图
LGWR
(1),每3秒写一次日志;
(2),任何commit时;
(3),redo log buffer满1/3,或已经达到1MB;
(4),另外在DBWR被要求数据写入磁盘时,可能需要LGWR先写相关的redo log,即确保任何写入磁盘的数据的redo log都已经写入.
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