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🥇 Ask a Database Performance Question I want to ask a database performance question. type/question, type/performance

Performance Questions

  • What version of TiDB are you using?
  • What's the observed and your expected performance respectively?

  • Have you compared TiDB with other databases? If yes, what's their difference?

  • For a specific slow SQL query, please provide the following information:

    • Whether you analyzed the tables involved in the query and how long it is after you ran the last ANALYZE.
    • Whether this SQL query always or occasionally runs slowly.
    • The EXPLAIN ANALYZE result of this query if your TiDB version is higher than 2.1, or you can just provide the EXPLAIN result.
    • The plain text of the SQL query and table schema so we can test it locally. It would be better if you can provide the dumped statistics information.
    • The EXPLAIN result of the compared database. For MySQL, EXPLAIN format=json's result will be more helpful.
    • Other information that is useful from your perspective.
  • For a general performance question, e.g. the benchmark result you got by yourself is not expected, please provide the following information:

    • Your cluster's topology architecture.
    • A simple description of you workload.
    • The metrics PDF generated from Grafana monitor. Remember to set the time range to the performance issue duration.