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APPLIES TO: Oracle Database - Enterprise Edition - Version 12.2.0.1 and laterInformation in this document applies to any platform. SYMPTOMS Alert log 阅读全文
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说明:产生direct path read事件的原因有三种情况: Causes This situation occurs in the following situations: The sorts are too large to fit in memory and some of the so 阅读全文
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Environment – Oracle 12c EE 12.1.0.2.0, 64bit on RHEL 7.3The task auto optimizer stats collection is created by catmwin.sql (run by catproc.sql during 阅读全文
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今天遇到个问题,客户说某天的11:45开始,系统遇到了大量的cursor pin s wait on X,经历一个小时后自动消失,需要查找原因。 这报错一般是某个会话需要申请S模式的mutex,而mutex被其他会话以X模式占有了。查holder也很容易,11g版本前看p2raw的前8位,将16进制 阅读全文
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A multiprocess Oracle database uses some additional processes called background processes. The background processes perform maintenance tasks required 阅读全文
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Prior to 12c,PGA_AGGREGATE_TARGET was the Parameter used to control amount of memory allocated to User Processes(mainly work areas). However PGA_AGGRE 阅读全文