Description:
Page: https://dev.mysql.com/doc/refman/9.1/en/replication-gtids-concepts.html
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GTIDs originating from the same server but having different tags are treated in a manner similar to those originating from different servers, like this:
3E11FA47-71CA-11E1-9E33-C80AA9429562:Domain_1:1-3:15-21, 3E11FA47-71CA-11E1-9E33-C80AA9429562:Domain_2:8-52
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mysql-9.1.0> reset binary logs and gtids;
Query OK, 0 rows affected (0.03 sec)
mysql-9.1.0> set global gtid_purged='3E11FA47-71CA-11E1-9E33-C80AA9429562:Domain_1:1-3:15-21,
'> 3E11FA47-71CA-11E1-9E33-C80AA9429562:Domain_2:8-52';
Query OK, 0 rows affected (0.02 sec)
mysql-9.1.0> show global variables like 'gtid%';
+----------------------------------+-----------------------------------------------------------------------+
| Variable_name | Value |
+----------------------------------+-----------------------------------------------------------------------+
| gtid_executed | 3e11fa47-71ca-11e1-9e33-c80aa9429562:domain_1:1-3:15-21:domain_2:8-52 |
| gtid_executed_compression_period | 0 |
| gtid_mode | ON |
| gtid_owned | |
| gtid_purged | 3e11fa47-71ca-11e1-9e33-c80aa9429562:domain_1:1-3:15-21:domain_2:8-52 |
+----------------------------------+-----------------------------------------------------------------------+
5 rows in set (0.00 sec)
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The text from the docs show the UUID part twice, once for each tag. This doesn't match the way this is displayed in gtid_executed as that uses one UUID.
How to repeat:
See description
