Dynamic Instance Resizing and log buffer
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1.
v$buffer_pool
2.查看redo_buffer是否存在问题
查看lgwn是否存在等待时间
1.select sid,event,seconds_in_wait,state from v$session_wait
where event='log buffer space';
2.查看是否等待archive 进程
select * from v$sgastat where name = 'redo entries' or name = 'redo buffer allocation retries';
两个value值的比例越小越好
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