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Doc. Update query-complexity.md

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Sergei Trifonov 2023-09-20 07:51:27 +02:00 committed by GitHub
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docs/en/operations/settings/query-complexity.md
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@ -157,7 +157,7 @@ At this time, it is not checked for one of the sorting stages, or when merging a
The `max_execution_time` parameter can be a bit tricky to understand.
It operates based on interpolation relative to the current query execution speed (this behaviour is controlled by [timeout_before_checking_execution_speed](#timeout-before-checking-execution-speed)).
ClickHouse will interrupt a query if the projected execution time exceeds the specified `max_execution_time`.
By default, the timeout_before_checking_execution_speed is set to 1 second. This means that after just one second of query execution, ClickHouse will begin estimating the total execution time.
By default, the timeout_before_checking_execution_speed is set to 10 seconds. This means that after 10 seconds of query execution, ClickHouse will begin estimating the total execution time.
If, for example, `max_execution_time` is set to 3600 seconds (1 hour), ClickHouse will terminate the query if the estimated time exceeds this 3600-second limit.
If you set `timeout_before_checking_execution_speed `to 0, ClickHouse will use clock time as the basis for `max_execution_time`.