Older and unneeded data is normally cleaned (deleted) from the database automatically according to system parameters that determine (for example) how long to retain records, how many records to retain, and how often to perform cleanup.
Manual database housekeeping and cleanup is intended for special situations where you might want to clean out more data than is cleaned out by the automatic clean up. For example, if disk space is low, you might want to remove a larger than normal portion of a particular type of data.
If you find that you are performing manual cleanups frequently, especially the same type of cleanup each time, consider adjusting the system parameters so that automatic cleanup matches the required cleanup pattern.
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