(PHP 4, PHP 5, PHP 7)
dba_optimize — Optimize database
dba_optimize ( resource $handle ) : bool
dba_optimize() optimizes the underlying database.
handle
The database handler, returned by dba_open() or dba_popen().
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.dba-optimize.php