Please take this survey to help us learn more about how you use third party tools. Your input is greatly appreciated!

Is it a good idea to run purge every hour?

Can someone help me with pro and cons of running purge every hour?

Tagged:

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.

  • Jim_KnicelyJim_Knicely Administrator
    edited June 12

    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:

    verticademos=> SELECT default_value, description FROM configuration_parameters WHERE parameter_name = 'PurgeMergeoutPercent';
     default_value |                                       description
    ---------------+------------------------------------------------------------------------------------------
     20            | Maximum % of rows that may be deleted before Tuple Mover purges the ROS through mergeout
    (1 row)
    

    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!!!

Leave a Comment

BoldItalicStrikethroughOrdered listUnordered list
Emoji
Image
Align leftAlign centerAlign rightToggle HTML viewToggle full pageToggle lights
Drop image/file

Can't find what you're looking for? Search the Vertica Documentation, Knowledge Base, or Blog for more information.