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Victimization of unused compression dictionaries from DBHEAP(RIMS)
Compression and Expansion dictionaries for each object (table, index) remain in memory until database deactivation time. This is problematic because enough DBHEAP must be allocated to host a compression/expansion dictionary for EACH object that is accessed before the next database deactivation. Ideally, we would like to see a victimization algorithm where seldom used dictionaries are removed from memory to make way for recently accessed dictionaries. This will keep the DBHEAP memory requirement down, which reduces total cost of ownership.
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