7/23/2019 A Lazy DBA' s Blog_ Steps to Perform Hang Analysis in Oracle When Database is Inaccessible or Hung State

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By profession i am an Oracle DBA. For the last few months I was thinking of sharing my day-to-day work 

related's learning with everyone. But I'm not sure that I'm good in explaining the things with others. So

please feel free to correct me if I'm making some mistakes in this blog.

 A Lazy dba' s blog

 Today, we had an issue where in which one of our rac database was

hung.since the database was not responding to any of the commands

the only option was to terminate the instance by the operating

system commands. Before aborting the database we decided tocollect as much disinformation possible so that or it will support

service can find the root cause. In this can of situations Oracle

recommends to collect hang analysis data for further 

troubleshooting.

Steps to perform an hang analysis 

========================= 

Step 1

=========

SQL> oradebug setmypid

SQL> oradebug unlimit;

SQL> oradebug hanganalyze 3

Step 2

========

SQL> oradebug setmypid

SQL> oradebug unlimit;

SQL> oradebug dump systemstate 266

Step 3

========

SQL> oradebug hanganalyze 3

Step 4

========SQL> oradebug setmypid

SQL> oradebug unlimit;

SQL> oradebug dump systemstate 266

Please refer metalink note 61552.1  for further details on the steps.

Problem we faced 

================ 

 we could not performed the above steps because the database was

not accepting a new collection

 

Solution

======

 

 

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7/23/2019 A Lazy DBA' s Blog_ Steps to Perform Hang Analysis in Oracle When Database is Inaccessible or Hung State

http://slidepdf.com/reader/full/a-lazy-dba-s-blog-steps-to-perform-hang-analysis-in-oracle-when-database 2/2

 

 When the database is not accepting the new collection is due to the

hung status, start a preliminary correction to the database as follows

 

sqlplus -prelim " / as sysdba" 

 

Then perform the steps mentioned above.

 

 After collecting the hang analysis details we terminated the database

instance resolve the issue

Posted by praveenchandran at 3:49 AM 

Labels: General DBA 

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