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MySQL 5.7 Reference Manual
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17.4.1.3 Finding the Primary

The following example shows how to find out which server is currently the primary when deployed in single-primary mode.

mysql> SELECT VARIABLE_VALUE FROM performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member';
+--------------------------------------+
| VARIABLE_VALUE                       |
+--------------------------------------+
| 69e1a3b8-8397-11e6-8e67-bf68cbc061a4 |
+--------------------------------------+

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