Use the nzreclaim command to recover disk space that is used by updated or deleted data by using the GROOM TABLE command.
Note: Starting in release 6.0, the SQL GROOM TABLE command replaces the nzreclaim command. The nzreclaim command is now a “wrapper” that calls the GROOM TABLE command to reclaim space. if you have existing scripts that use the nzreclaim command, those scripts continue to run, although some of the options might be deprecated since they are not used by GROOM TABLE. You should use the GROOM TABLE command in your scripts.