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Is it a good idea to run purge every hour?
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Answers
The only reason you'd need to run Purge is if you're issuing a ton of delete/update commands. Otherwise, there's no point whatsoever.
As @Vertica_Curtis indicates, it's best to avoid manual purges
They can run for a very long time!
Take a look at the PurgeMergeoutPercent configuration parameter:
If you want Vertica to be more assertive on purging data automatically, you can try lowering the percentage to between 5 and 10. Do not go below 5, though! Setting PurgeMergeoutPercent value low will aggressively qualify ROS containers for purge operation and that will have significant impact on system resources!!!