Typically you will not lose speed but you will waste space after a long use of a single database with many deletions and changes. The way to fix it is to copy everything to a new database file record-by-record, and then replace the old with the new. I've seen a couple of utilities for this that you might be able to find if you Google for them.

In reply to Re: Defragmentation of a BTREE DB_File by perrin
in thread Defragmentation of a BTREE DB_File by traxlog

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