Q
Problem solve Get help with specific problems with your technologies, process and projects.

Making sense of temporary addresses usage

On WRKSYSSTS I have the following % temp. addresses:

                                      
 % CPU used . . . . . . . :       16,6
 % DB capability  . . . . :       12,3
 Elapsed time . . . . . . :   00:01:37
 Jobs in system . . . . . :       8063
 % perm addresses . . . . :      0,128
 % temp addresses . . . . :     10,453

How can I get this % lower? IPL does not do the trick.

You are correct that an IPL won't reset temporary address usage back to zero. This used to be the case when the AS/400 had a 48-bit processor (in the old CISC days), but when IBM went to RISC processor technology and 64 bits, it extended the address range dramatically. As far as I know, there is no way to reset or reclaim the used temporary address space. And once you get to 100%, I have been told that your system will stop working. The good news for most people is that the 100% number won't be reached for a LONG time (years), and you will probably have purchased new hardware long before you run out of addresses.

To get a rough calculation of how long before you reach 100%, measure the number of hours to see an incremental change, like .01%, and then extrapolate to the number of hours (or convert to days, weeks, months, or years).

If you feel that the addresses are getting used up too fast, you should probably contact IBM. They can have you gather some data using Performance Explorer and tell you what programs or functions are using up the addresses and should be able to help you determine how to fix the problem (program changes, query optimization, etc).

This was last published in June 2005

Dig Deeper on Performance

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

Join the conversation

1 comment

Send me notifications when other members comment.

Please create a username to comment.

See http://www-01.ibm.com/support/docview.wss?uid=nas8N1015972

-There are 274,877,906,944 (274 billion) temporary addresses.

-CPI0997 will be issued once temp address space is over 90%

-V5R3 and later temporary addresses will reset after an IPL if the used amount is above 85%.

-V7R1 and later SMSETTEMPSIDWRAP advanced analysis macro can be used to change the 85% threshold.

So unless you are consuming temp addresses at a high rate and you would consume the 15% range between 85-100 before an IPL you should not have an issue.
Cancel

-ADS BY GOOGLE

SearchDataCenter

  • How do I size a UPS unit?

    Your data center UPS sizing needs are dependent on a variety of factors. Develop configurations and determine the estimated UPS ...

  • How to enhance FTP server security

    If you still use FTP servers in your organization, use IP address whitelists, login restrictions and data encryption -- and just ...

  • 3 ways to approach cloud bursting

    With different cloud bursting techniques and tools from Amazon, Zerto, VMware and Oracle, admins can bolster cloud connections ...

Close