Describes how to compact the database.
When a File-store database is constructed using the RDbNamedDatabase interface, there is no access to the underlying store in order to compact it and recover any free space for re-use.
The RDbDatabase abstract base class, however, supports a compacting interface, the Compact() member function. The class also offers a complementary interface, the UpdateStats() and Size() member functions, which calculate and report size and usage information.
Incremental forms of these functions are also offered by the RDbIncremental class.
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