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Status Not under consideration
Workspace Db2
Components Monitoring
Created by Guest
Created on Nov 19, 2014

Alert user about abnormal tablespaces on standby

In a HADR configuration typically customers use db2pd -hadr on the standby to monitor the state. On the standby if there is a problem with one of the tablespaces it'll be marked invalid and future log records against the tablespace will be skipped. If one continues to monitor the state of HADR via db2pd -hadr the peer state will remain potentially missing the tablespace issue.

Update the db2pd -hadr command hinting to the potential problem.

The requirement is also described at https://db2wiki.torolab.ibm.com/index.php/HADR_performance_monitoring#Alert_user_about_abnormal_tablespaces_on_standby

Alert user about abnormal tablespaces on standby

Tablespaces can be in abnormal state on standby. Common causes are replay error on the tablespace and media error. Standby will skip log records associated to abnormal tablespaces. At database level, the db will appear normal. This can be misleading to users.

At takeover time, we do loop through all tablespaces and print warning on abnormal ones into db2diag.log. But that message can be easily missed by DBA and may be too late.

The proposal here is to add a warning flag to the usual HADR monitoring fields indicating some tablespaces are in abnormal state. For consistency, this field should be applicable on both P and S. The flag should be updated whenever tablespace state changes.