SET CLUSTER SETTING

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The SET CLUSTER SETTING statement modifies a cluster-wide setting.

Warning:

Many cluster settings are intended for tuning CockroachDB internals. Before changing these settings, we strongly encourage you to discuss your goals with CockroachDB; otherwise, you use them at your own risk.

Required privileges

To use the SET CLUSTER SETTING statement, a user must have one of the following attributes:

Be a member of the admin role. (By default, the root user belongs to the admin role.)
Have the MODIFYCLUSTERSETTING system-level privilege granted. root and admin users have this system-level privilege by default and are capable of granting it to other users and roles using the GRANT statement. For example to grant this system-level privilege to user maxroach:
```
GRANT SYSTEM MODIFYCLUSTERSETTING TO maxroach;
```
Have the MODIFYSQLCLUSTERSETTING system-level privilege granted. Users with this privilege are allowed to modify only sql.defaults.* cluster settings, not all cluster settings.

Synopsis

Note:

The SET CLUSTER SETTING statement is unrelated to the other SET TRANSACTION and SET {session variable} statements.

Parameters

Parameter	Description
`var_name`	The name of the cluster setting (case-insensitive).
`var_value`	The value for the cluster setting.
`DEFAULT`	Reset the cluster setting to its default value. The `RESET CLUSTER SETTING` resets a cluster setting as well.

Examples

Change the default distributed execution parameter

To configure a cluster so that new sessions automatically try to run queries in a distributed fashion:

> SET CLUSTER SETTING sql.defaults.distsql = 1;

To disable distributed execution for all new sessions:

> SET CLUSTER SETTING sql.defaults.distsql = 0;

Note:

Use ALTER ROLE ALL SET {sessionvar} = {val} instead of the sql.defaults.* cluster settings. This allows you to set a default value for all users for any session variable that applies during login, making the sql.defaults.* cluster settings redundant.

Disable automatic diagnostic reporting

To opt out of automatic diagnostic reporting of usage data to Cockroach Labs:

> SET CLUSTER SETTING diagnostics.reporting.enabled = false;

> SHOW CLUSTER SETTING diagnostics.reporting.enabled;

  diagnostics.reporting.enabled
---------------------------------
              false
(1 row)

Reset a setting to its default value

Tip:

You can use RESET CLUSTER SETTING to reset a cluster setting as well.

> SET CLUSTER SETTING sql.metrics.statement_details.enabled = false;

> SHOW CLUSTER SETTING sql.metrics.statement_details.enabled;

  sql.metrics.statement_details.enabled
-----------------------------------------
                  false
(1 row)

> SET CLUSTER SETTING sql.metrics.statement_details.enabled = DEFAULT;

> SHOW CLUSTER SETTING sql.metrics.statement_details.enabled;

  sql.metrics.statement_details.enabled
-----------------------------------------
                  true
(1 row)

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