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关于oradebug -prelim

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在oracle数据库hang的情况下,我们可以用sqlplus -prelim / as sysdba登录数据库,进行一些收集信息的操作,也可以进行shutdown database的操作。这里需要注意几点:

1. process满是可以用sqlplus -prelim / as sysdba登录的

2. 从11.2.0.2开始,sqlplus -prelim / as sysdba是不能收集hanganalyze的信息,即使hanganalyze命令运行成功,但是在trace文件中看不到对应的信息,只能看到如下的报错:

ERROR: Can not perform hang analysis dump without a process state object and a session state object.
( process=(nil), sess=(nil) )

3. sqlplus -prelim / as sysdba可以收集process state dump,system state dump,dump errorstack,short_stack的操作。

参考:How to Collect Diagnostics for Database Hanging Issues (Doc ID 452358.1)


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