Can someone explain how the -C value drops to the -CL value?

Hi all,
sorry if this question is rather silly but Im trying to understand how the system knows when to change the cache from the -C value to the -CL value in Sybase 12.
The official documentation explains this as
-C = "Sets the initial memory reserved for caching database pages and other database server information".
-CL = "Sets a minimum cache size as a lower limit to dynamic cache resizing".
It also states "This option sets a lower limit to the cache. If -c is specified, and -cl is not specified, then the minimum cache size is set to the initial cache size (the -c setting)".
My question is WHEN and HOW does the system know to drop the amount of Cache from the -C to the -CL values?
Example:
-C 6G -CL 2G
Thanks
David

Hi David,
Two common scenarios where this could happen:
If there is a lack of physical memory available on the host machine, SQL Anywhere will lower it's cache size in response. The processes private working set is checked periodically to make sure the cache is backed by physical memory.
If the sum of all images (dbspaces + temp files + internal overhead) is less the the initial cache size, the database server will run with a cache size sufficient to store this information. In your example of -c 6G -cl 2G, this means that if the sum of all possible data that could be in cache was 1GB, the current cache size would be 2GB (even at startup).
Setting an initial cache size close to the value you expect the cache to be is a good idea, internal structures are initialized at startup based on this value.
Mikel

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