13.4.3.4 Functions which Configure the Group Replication Mode

Contents

The following functions enable you to control the mode which a replication group is running in, either single-primary or multi-primary mode.

group_replication_switch_to_single_primary_mode()
Changes a group running in multi-primary mode to single-primary mode, without the need to stop Group Replication. Must be issued on a member of a replication group running in multi-primary mode. When you change to single-primary mode, strict consistency checks are also disabled on all group members, as required in single-primary mode (group_replication_enforce_update_everywhere_checks=OFF).
Syntax:
```
STRING group_replication_switch_to_single_primary_mode([str])
```
Arguments:
- str: A string containing the UUID of a member of the group which should become the new single primary. Other members of the group become secondaries.
Return value:
A string containing the result of the operation, for example whether it was successful or not.
Example:
1. SELECT group_replication_switch_to_single_primary_mode(member_uuid);
For more information, see Section 18.4.1.2, “Changing a Group's Mode”
group_replication_switch_to_multi_primary_mode()
Changes a group running in single-primary mode to multi-primary mode. Must be issued on a member of a replication group running in single-primary mode.
Syntax:
```
STRING group_replication_switch_to_multi_primary_mode()
```
This function has no parameters.
Return value:
A string containing the result of the operation, for example whether it was successful or not.
Example:
1. SELECT group_replication_switch_to_multi_primary_mode()
All members which belong to the group become primaries.
For more information, see Section 18.4.1.2, “Changing a Group's Mode”

Find a PHP function

Document created the 26/06/2006, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/mysql-rf-group-replication-functions-for-mode.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

Manuel MySQL : https://dev.mysql.com/

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut