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ClickHouse/.github/ISSUE_TEMPLATE/70_performance-issue.md
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Performance issue Report something working slower than expected performance

(you don't have to strictly follow this form)

Company or project name Put your company name or project description here

Describe the situation What exactly works slower than expected?

How to reproduce

  • Which ClickHouse server version to use
  • Which interface to use, if matters
  • Non-default settings, if any
  • CREATE TABLE statements for all tables involved
  • Sample data for all these tables, use clickhouse-obfuscator if necessary
  • Queries to run that lead to slow performance

Expected performance What are your performance expectation, why do you think they are realistic? Has it been working faster in older ClickHouse releases? Is it working faster in some specific other system?

Additional context Add any other context about the problem here.