Backing Up Oracle - Computing at Cornell
Backing Up Oracle - Computing at Cornell
Backing Up Oracle - Computing at Cornell
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Appendix D. Performance<br />
This appendix describes performance aspects of <strong>Oracle</strong> RMAN with TDP for<br />
<strong>Oracle</strong>. There are other performance aspects such as oper<strong>at</strong>ing system<br />
tuning, <strong>Oracle</strong> d<strong>at</strong>abase tuning, disk I/O tuning, and network tuning, which<br />
are not covered in this chapter. All the performance consider<strong>at</strong>ions in this<br />
chapter should be reviewed in the light of your own system, as they can only<br />
be offered as guidelines for review.<br />
D.1 Generic performance issues<br />
Some of the most important consider<strong>at</strong>ions when it comes to performance are<br />
not the technical aspects but the environment and organiz<strong>at</strong>ional aspects.<br />
For example, let us assume th<strong>at</strong> the enterprise has more than twenty <strong>Oracle</strong><br />
servers, every server uses the same TSM server and on every server <strong>at</strong><br />
exactly two o’clock in the morning a d<strong>at</strong>abase backup is started. Here it does<br />
not make sense to tune backup performance.<br />
In this situ<strong>at</strong>ion, it is advisable, th<strong>at</strong> only a small group of persons coordin<strong>at</strong>es<br />
the schedule of all the different backups.<br />
D.1.1 TSM and TDP generic performance issues<br />
TDP for <strong>Oracle</strong> uses the following options in the client system option file<br />
dsm.sys and client user option file dsm.opt, which affect performance:<br />
COMPRESSION<br />
- Specify COMPRESSION YES for TDP for <strong>Oracle</strong> to compress d<strong>at</strong>a<br />
before sending it to the TSM server. This reduces storage usage on the<br />
TSM server. COMPRESSION YES affects performance in two ways:<br />
- CPU utiliz<strong>at</strong>ion is higher on the machine on which TDP for <strong>Oracle</strong> is<br />
running. Network bandwidth utiliz<strong>at</strong>ion is lower because fewer bytes<br />
are transmitted. It is recommended th<strong>at</strong> COMPRESSION YES be<br />
specified when any of the following conditions exist:<br />
The network adapter has a d<strong>at</strong>a overload.<br />
Communic<strong>at</strong>ions between TDP for <strong>Oracle</strong> and the TSM server are<br />
over a low bandwidth connection.<br />
There is heavy network traffic.<br />
- Specify COMPRESSION NO if the machine running TDP for <strong>Oracle</strong><br />
has a CPU overload. This prevents additional CPU usage from<br />
impacting other applic<strong>at</strong>ions, including the <strong>Oracle</strong> server.<br />
© Copyright IBM Corp. 2001 223
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