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1.1 KiB
1.1 KiB
slug | sidebar_label |
---|---|
/en/operations/startup-scripts | Startup Scripts |
Startup Scripts
ClickHouse can run arbitrary SQL queries from the server configuration during startup. This can be useful for migrations or automatic schema creation.
<clickhouse>
<startup_scripts>
<scripts>
<query>CREATE ROLE OR REPLACE test_role</query>
</scripts>
<scripts>
<query>CREATE TABLE TestTable (id UInt64) ENGINE=TinyLog</query>
<condition>SELECT 1;</condition>
</scripts>
</startup_scripts>
</clickhouse>
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.
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
.
:::note
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.
:::