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31 lines
1.1 KiB
Markdown
31 lines
1.1 KiB
Markdown
---
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slug: /en/operations/startup-scripts
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sidebar_label: Startup Scripts
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---
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# Startup Scripts
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ClickHouse can run arbitrary SQL queries from the server configuration during startup. This can be useful for migrations or automatic schema creation.
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```xml
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<clickhouse>
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<startup_scripts>
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<scripts>
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<query>CREATE ROLE OR REPLACE test_role</query>
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</scripts>
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<scripts>
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<query>CREATE TABLE TestTable (id UInt64) ENGINE=TinyLog</query>
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<condition>SELECT 1;</condition>
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</scripts>
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</startup_scripts>
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</clickhouse>
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```
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ClickHouse executes all queries from the `startup_scripts` sequentially in the specified order. If any of the queries fail, the execution of the following queries won't be interrupted.
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You can specify a conditional query in the config. In that case, the corresponding query executes only when the condition query returns the value `1` or `true`.
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:::note
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If the condition query returns any other value than `1` or `true`, the result will be interpreted as `false`, and the corresponding won't be executed.
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:::
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