SET LEAF

Syntax

SET LEAF variable_name = value

Arguments

variable_name: name of the sync variable.
value: value to be assigned to the sync variable.

Remarks

variable_name must be a sync variable that can sync to all nodes (aggregators and leaves).
You cannot this command on a non-sync variable.
This command must be run on the master aggregator.

Examples

Example 1

The following example syncs the variable regexp_format to all leaves. SET LEAF can be run on regexp_format because regexp_format is a variable that can sync to all nodes (leaves and aggregators).

SQL

SET LEAF regexp_format = "extended";

Retrieve the variable’s value:

SQL

SELECT @@regexp_format;

+-----------------+
| @@regexp_format |
+-----------------+
| extended        |
+-----------------+

Example 2

The following example attempts to sync the variable auto_attach to all leaves. SET LEAF fails because auto_attach is a variable that can sync to all aggregators, only.

SQL

SET LEAF auto_attach = 1;

ERROR 2324 (HY000): This workspace-wide variable exists only on 
aggregators, it's not possible to set a value for leaves

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