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Sybase - sp_cacheconfig

Posted on 2013-12-05
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Last Modified: 2014-01-14
Hello there,
I'm little loss with sp_cacheconfig, what is this use for and how the cacheconfig will help to improve total performance of ASE ? what are the different between cacheconfig and sp_configure 'memory' ??

1> sp_cacheconfig
2>
 Cache Name         Status   Type     Config Value   Run Value
 ------------------ -------- -------- -------------- ------------
 default data cache Active   Default    1000.00 Mb     1000.00 Mb
                                   ------------ ------------
                            Total    1000.00 Mb   1000.00 Mb
==========================================================================
Cache: default data cache,   Status: Active,   Type: Default
      Config Size: 1000.00 Mb,   Run Size: 1000.00 Mb
      Config Replacement: strict LRU,   Run Replacement: strict LRU
      Config Partition:            1,   Run Partition:            1
 IO Size  Wash Size     Config Size  Run Size     APF Percent
 -------- ------------- ------------ ------------ -----------
     2 Kb      61440 Kb    750.00 Mb    750.00 Mb     10
     4 Kb      10240 Kb     50.00 Mb     50.00 Mb     10
    16 Kb      40960 Kb    200.00 Mb    200.00 Mb     10
(return status = 0)
1>
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Question by:motioneye
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alpmoon earned 2000 total points
ID: 39701327
It is a long topic. But basically sp_cacheconfig shows configuration of data cache. You can create named caches as well. In that way you can allocate certain amount of data cache to certain objects or a database.

Also you can use sp_poolconfig to change size of memory pools (2K, 4K and 16K pools you have) or to create a new one (you can create a 8K pool as well even though it is not suggested when you have 16K pool).

More details for sp_cacheconfig can be found at:

http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.infocenter.dc36273.1570/html/sprocs/X66462.htm

To put into perspective data cache is part of total memory used during data read/write operations (that includes both actual data and transaction log read/write). Procedure cache, metadata structures are also part of total memory. sp_configure shows all of them including other memory structures.
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