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Pandora-Box
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Joined: 07 Sep 2006
Posts: 1592
Location: Andromeda Galaxy
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Hi,
I am trying to capture the extents information by the doing a listcat against underlined tablespace datasets.So I have a set of file to for which the extents information need to be found.
So I have a REXX program which reads the files and does a listcat and writes to output file.
So if there are 15k FILES for which I need to do listcat and get the extent information its taking long time.
How would I go about it in reducing the amount of time consumed?
Regards,
Prem |
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enrico-sorichetti
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Joined: 14 Mar 2007
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Location: italy
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| Quote: |
| underlined tablespace datasets |
please clarify  |
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Pandora-Box
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Sorry Enrico
I ment the LDS of the tablespace |
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dbzTHEdinosauer
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Joined: 20 Oct 2006
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if you are doing this in foreground, will take a while.
it should be done in batch. |
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dick scherrer
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Joined: 23 Nov 2006
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Hello,
| Quote: |
How would I go about it in reducing the amount of time consumed |
Not much you can control. . .
You might run this when the system is least busy. . .
Is there some reason you don't use the db2 statsitics rather than the listcat? The queries to select table/tablespace data execute very quickly. Is there something (useful) the "extents" will provide that the db2 catalog will not? |
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Pandora-Box
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Joined: 07 Sep 2006
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Hi Dick Brenholtz,
I am executing it in batch only.
Hi Dick scherrer,
I do agree with you that you can get this information from SYSTABLEPART,SYSTABLESPACE,SYSINDEXES,SYSINDEXPART provided you have your runstats being done on a regular basis.
If you do in my approach you would get the info upto date |
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dick scherrer
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Joined: 23 Nov 2006
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Hello,
| Quote: |
| provided you have your runstats being done on a regular basis. |
And runstats should be done regularly. . .
| Quote: |
| If you do in my approach you would get the info upto date |
The listcat info is quite limited compared to the catalog info. There is also the matter of how much system resource is this worth?
Suggest considering the schedule be changed to do the runstats each week and these queries run immediately thereafter. |
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Pandora-Box
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Joined: 07 Sep 2006
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Dick,
Thanks again Dick for your suggesions.
I do agree with you but too many runstats isnt it a overhead?
Please advice.
LISTCAT info is quite limited but I am keen only on the EXTENTS so which is very needful info for DBA'S to calculate the growth. |
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dick scherrer
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Hello,
| Quote: |
| I do agree with you but too many runstats isnt it a overhead? |
Sure, if runstats was run every hour on the hour. . . I suspect that once a week or so would not be excessive.
How does the system usage for the full listcat compare to the system usage for runstats and the queries? Suggest that runstats be kept current even if the listcat is used. . . |
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