Backing Up Oracle - Computing at Cornell
Backing Up Oracle - Computing at Cornell
Backing Up Oracle - Computing at Cornell
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The problem is th<strong>at</strong> during the <strong>Oracle</strong> backup, a session is opened with the<br />
TSM server and the backup transaction is started. After d<strong>at</strong>a th<strong>at</strong> exists in the<br />
<strong>Oracle</strong> file is sent to the TSM server, the backup then goes into a loop<br />
skipping the empty space in the d<strong>at</strong>abase file (Null values). If there is a lot of<br />
empty space, the TSM server can time-out and close the session before<br />
RMAN can give the TDP client any additional d<strong>at</strong>a to send or finish the<br />
transaction.<br />
This issue is normally witnessed if the value for commtimeout on the TSM<br />
server is set to a low value (such as the default of 60 seconds). It is<br />
suggested to set the commtimeout value to 600-1200 seconds when working<br />
with d<strong>at</strong>abase backups. This value is set in the dsmserv.opt file for the TSM<br />
server and requires the TSM server to be restarted to take effect.<br />
COMMTIMEOUT 600<br />
B.2.2 Administr<strong>at</strong>ive client queries<br />
If you are encountering errors, there are some things th<strong>at</strong> you should check<br />
on the TSM server using the administr<strong>at</strong>ive client and the query command.<br />
Run the command query node nodename f=d replacing nodename with the<br />
nodename th<strong>at</strong> is used to back up <strong>Oracle</strong>. The value for Backup Deleted<br />
Allowed should be set to YES. The value for Maximum Mount Points Allowed<br />
should be equal to or less than the number of drives on the TSM server. The<br />
value for Locked? should be set to NO. The value for Policy Domain Name<br />
should be checked to make sure it belongs to the correct domain. This value<br />
determines wh<strong>at</strong> management classes are available to the node for managing<br />
the <strong>Oracle</strong> backups.<br />
Using the value of Policy Domain Name, you can run some queries to see if<br />
the correct management classes for the <strong>Oracle</strong> backups are available. The<br />
command query mgmtclass active will show which is the DEFAULT<br />
management class for the node. The command query copygroup <br />
active will tell you wh<strong>at</strong> the retention settings are for the management<br />
classes.<br />
B.3 Isol<strong>at</strong>ing the problem<br />
When troubleshooting, you must try to isol<strong>at</strong>e the cause of the problem. The<br />
four main areas in which to try to isol<strong>at</strong>e the problem are: <strong>Oracle</strong> RMAN, TDP<br />
for <strong>Oracle</strong>, TSM API, and TSM Server.<br />
Appendix B. Troubleshooting 203
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