enable_vacuum_boost - Amazon Redshift
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Values (default in bold)

false, true


Specifies whether to enable the vacuum boost option for all VACUUM commands run in a session. If enable_vacuum_boost is true, Amazon Redshift runs all VACUUM commands in the session with the BOOST option. If enable_vacuum_boost is false, Amazon Redshift doesn't run with the BOOST option by default. For more information about the BOOST option, see VACUUM.