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28 lines
932 B
Markdown
28 lines
932 B
Markdown
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---
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name: Performance issue
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about: Report something working slower than expected
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title: ''
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labels: performance
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assignees: ''
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---
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(you don't have to strictly follow this form)
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**Describe the situation**
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What exactly works slower than expected?
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**How to reproduce**
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* Which ClickHouse server version to use
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* Which interface to use, if matters
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* Non-default settings, if any
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* `CREATE TABLE` statements for all tables involved
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* Sample data for all these tables, use [clickhouse-obfuscator](https://github.com/yandex/ClickHouse/blob/master/dbms/programs/obfuscator/Obfuscator.cpp#L42-L80) if necessary
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* Queries to run that lead to slow performance
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**Expected performance**
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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?
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**Additional context**
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Add any other context about the problem here.
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