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add notes for session var #82

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merged 4 commits into from
Nov 27, 2024
Merged

add notes for session var #82

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991b35f
add a note for alter system set session var
xxchan Nov 26, 2024
b8a05c7
add note
xxchan Nov 26, 2024
c4497d3
Update operate/view-configure-runtime-parameters.mdx
hengm3467 Nov 27, 2024
1709cba
Update operate/view-configure-runtime-parameters.mdx
hengm3467 Nov 27, 2024
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10 changes: 9 additions & 1 deletion operate/view-configure-runtime-parameters.mdx
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Expand Up @@ -4,7 +4,7 @@ title: "View and configure runtime parameters"

## What are runtime parameters?

Runtime parameters are variables that can be set at runtime to configure the behavior of RisingWave.
Runtime parameters are variables that can be set at runtime to configure the behavior of RisingWave. They are also known as session variables.

## How to view runtime parameters?

Expand Down Expand Up @@ -94,8 +94,16 @@ Where `parameter_name` is the name of the parameter, and `value` or `'value'` is

For details about the `set_config()` function, see [System administration functions](/sql/functions/sys-admin#set-config), and for details about the `SET` command, see [SET](/sql/commands/sql-set).

<Note>
`SET` applies only to the current session.
</Note>

You can also use the [ALTER SYSTEM SET](/sql/commands/sql-alter-system) command to set a system-wide default value for a runtime parameter. This configuration will then be applied to every new session.

<Note>
`ALTER SYSTEM SET` takes effect in new sessions. The value of the runtime parameter remains unchanged in the current session.
</Note>

```sql Syntax
ALTER SYSTEM SET session_param_name TO session_param_value;
```
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