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29 lines
845 B
Markdown
29 lines
845 B
Markdown
# Prevent A Query From Running Too Long
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A number of different factors can effect how long a query takes to run.
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Certainly the size of a table and the complexity of the query play a big role.
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Locking can really slow a query down by making it wait to get started. A series
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of competing queries that induce table locking can grind things to a halt.
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If you don't want queries in a particular connection being allowed to wait or
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run too long, you can set a timeout.
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```sql
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set statement_timeout to '500';
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```
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That will ensure that any statement run in that connection will be terminated
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if it takes longer than 500ms.
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You can also specify a unit:
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```sql
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set statement_timeout to '15s';
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```
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That will enforce statement timeout of 15 seconds.
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See the
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[docs](https://www.postgresql.org/docs/current/runtime-config-client.html) for
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more details.
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