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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
Only the root user can modify 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
You can configure a cluster so that new sessions automatically try to run queries in a distributed fashion:
> SET CLUSTER SETTING sql.defaults.distsql = 1;
You can also disable distributed execution for all new sessions:
> SET CLUSTER SETTING sql.defaults.distsql = 0;
Disable Automatic Diagnostic Reporting
You can opt out of automatic diagnostic reporting of usage data to Cockroach Labs using the following:
> 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)
See Also
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