Set the suggested size of the shared memory buffer pool, i.e., the cache,
in bytes. This should be the size of the normal working data set of the
application, with some small amount of additional memory for unusual
situations. (Note, the working set is not the same as the number of
simultaneously referenced pages, and should be quite a bit larger!)
The value specified may not be less than 20K bytes.
If no value is specified, the default is 128K bytes (16 8K byte pages).