Allow (add) ability to specify database cache in kb/mb/gb
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                 Key: CORE-4170
                 URL: http://tracker.firebirdsql.org/browse/CORE-4170
             Project: Firebird Core
          Issue Type: New Feature
          Components: Engine
    Affects Versions: 3.0 Alpha 1
            Reporter: kdv


I ask in addition to existing DefaultDbCachePages add new 
firebird.conf/database.conf parameter
DefaultDBCacheSize which can be specified in kilobytes, megabytes or gigabytes 
of memory directly.

For example, 
DefaultDBCacheSize = 8m
i.e allocate 8 megabytes of cache for the DB.

Of course, engine can divide this value by page_size and select closest round 
number of pages for cache.

If both DefaultDbCachePages and DefaultDBCacheSize specified, bigger value can 
be taken.

As alternative to gfix -buffers n, I think, need to be added new parameter. 
maybe -cachesize n ?
Also we need new dpb parameter like isc_dpb_num_buffers.



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