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What are some query performance troubleshooting tips?

rjs_docsrjs_docs Employee
edited April 2020 in General Discussion

Can you please provide some query performance troubleshooting tips? For example, when most of my users are reporting that queries are running longer than expected time, what can I quickly check to find the source of the issue?
@bat @rbankula

From Optimizing Query Performance and Resource Pool Tuning.

Answers

  • I would start with the current list of sessions and queries executed.
    Maybe a web frontend is running a "attack" on Vertica.
    Next step should be the system performance.
    Is everything healthy? RAID Controller with healthy cache? BatteryBackupUnit?
    AWS EBS slow?
    Only after these checks I would dive into the data and tables itself.
    Maybe recent changes on projections or the amount of data getting ingested changed.

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