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https://dev.mysql.com/doc/refman/8.0/en/gis-class-polygon.html
A Polygon is a planar Surface representing a multisided geometry. It is defined by a single exterior boundary and zero or more interior boundaries, where each interior boundary defines a hole in the Polygon. Polygon Examples On a region map, ...
https://dev.mysql.com/doc/refman/8.0/en/gis-data-formats.html
WKB values for more complex geometry values have more complex data structures, as detailed in the OpenGIS specification. Two standard spatial data formats are used to represent geometry objects in queries: Well-Known Text (WKT) format Well-Known ...
https://dev.mysql.com/doc/refman/8.0/en/gis-general-property-functions.html
For example: SET @g1 = ST_PointFromText('POINT(1 1)', 4326); SET @g1 = ST_GeomFromText('POINT(1 1)', 4326); The two-argument form of ST_SRID() is useful for tasks such as correcting or changing the SRS of geometries that have an incorrect SRID. The ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-communication-protocol.html
If you no longer need to support members at earlier releases, you can use the group_replication_set_communication_protocol() function to set the communication protocol version to the new MySQL Server version to which you have upgraded the members.
https://dev.mysql.com/doc/refman/8.0/en/group-replication-compatibility-communication.html
If you do not need to support older members and want to allow the upgraded members to use any added communication capabilities, after the upgrade use the group_replication_set_communication_protocol() function to upgrade the communication protocol, ... A replication group uses a Group Replication communication protocol version that can differ from the MySQL Server version of the ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-configuring-online-group.html
Important For the coordinator to be able to configure group wide actions on a running group, all members must be running MySQL 8.0.13 or higher and have the functions installed. You can configure an online group while Group Replication is running ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-deploying-in-multi-primary-or-single-primary-mode.html
It is not possible to have members of the group deployed in different modes, for example one member configured in multi-primary mode while another member is in single-primary mode. Group Replication operates either in single-primary mode or in ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-distributed-recovery-fault.html
Selecting a different donor in the event of an error means that there is a chance the new candidate donor does not have the same error. Group Replication's distributed recovery process has a number of built-in measures to ensure fault tolerance in ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-fault-tolerance.html
In practice this means that to tolerate one failure the group must have three servers in it. MySQL Group Replication builds on an implementation of the Paxos distributed algorithm to provide distributed coordination between servers. As such, it ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-group-membership.html
In the case where a member leaves the group voluntarily, it first initiates a dynamic group reconfiguration, during which all members have to agree on a new view without the leaving server. In MySQL Group Replication, a set of servers forms a ...