What "exactly" does VACUUM mean in relation to nas Reorganize?

Document ID : KB000057047
Last Modified Date : 14/02/2018
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The reorganize command will take the NAS into maintenance mode, stopping all service modules and performs a VACUUM of the database.db and the transactionlog.db. All services are started upon completion.

http://docs.nimsoft.com/prodhelp/en_US/Probes/Catalog/nas/4.3/index.htm?toc.htm?1942568.html

The database size is supposed to reduce the file size after ?vacuum? has been run. Vacuum (i.e. sqlLite terminology) is only run if there is a quiet period where there aren?t any alarms to log.

For more details regarding VACUUM please navigate to the following web site/link below:

http://www.sqlite.org/lang_vacuum.html