- Moveout: Moves data from WOS to ROS.
- Mergeout: Combines small ROS containers into larger ones and purges deleted data. The Tuple Mover operations are controlled by a set of configurable parameters. To quickly view the relevant parameter’s current values, you can call the LIST_SERVICES function.
dbadmin=> \a
Output format is unaligned.
dbadmin=> select list_services('TM');
list_services
Service: 'AnalyzeRowCount' is enabled , interval 86400 second(s)
Service: 'LGELaggingCheck' is enabled , interval 300 second(s)
Service: 'ManageEpochs' is enabled , interval 180 second(s)
Service: 'PartitionTables' is disabled , interval 3000 second(s)
Service: 'RebalanceCluster' is enabled , interval 300 second(s)
Service: 'TM Moveout' is enabled , interval 300 second(s)
Service: 'TM Mergeout' is enabled , sub-services:
Service: 'TM Mergeout(00)' is enabled , interval 600 second(s)
Service: 'TM Mergeout(01)' is enabled , interval 600 second(s)
(1 row)From the preceding output, notice that the Moveout operation occurs every 300 seconds and the Mergeout operation occurs every 600 seconds.
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About the Author
James Knicely
Vertica Field Chief Technologist
I've had the privilege of working with many database technologies in my career. But after being introduced to Vertica in May of 2011 as a client, I was hooked on the new technology after witnessing a query run in milliseconds that had previously ran for hours on the legacy database we had in place. It was then that I knew I wanted to eventually join the Vertica team, and 4 years later I did! I am currently a Vertica evangelist and am ready to help you get on board! Please feel free to reach out to me with any questions you have about Vertica and make sure to follow my Vertica Quick Tips!
