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https://dev.mysql.com/doc/refman/8.0/en/federated-storage-engine-resources.html
The following additional resources are available for the FEDERATED storage engine: A forum dedicated to the FEDERATED storage engine is available at https://forums.mysql.com/list.php?105.
https://dev.mysql.com/doc/refman/8.0/en/gis-class-geometry.html
In MySQL, the SRID value is an integer associated with the geometry value. It is a noninstantiable class but has a number of properties, described in the following list, that are common to all geometry values created from any of the Geometry ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-failure-detection.html
In that case, the suspect member is marked for expulsion from the group in a coordinated decision, and is expelled after the waiting period set by the group_replication_member_expel_timeout system variable expires and the expelling mechanism detects ... Group Replication’s failure detection mechanism is a distributed service which is able to identify that a server in the group is not communicating with the others, and is therefore suspected of being out of ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-fault-tolerance.html
MySQL Group Replication builds on an implementation of the Paxos distributed algorithm to provide distributed coordination between servers. As such, it requires a majority of servers to be active to reach quorum and thus make a decision. This has ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-fine-tuning-the-group-communication-thread.html
The group communication thread (GCT) runs in a loop while the Group Replication plugin is loaded. The GCT receives messages from the group and from the plugin, handles quorum and failure detection related tasks, sends out some keep alive messages ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-options.html
The next two sections contain information about MySQL server system and server status variables which are specific to the Group Replication plugin.
https://dev.mysql.com/doc/refman/8.0/en/group-replication-replication-group-members.html
The MEMBER_VERSION column can be useful when you are upgrading a group and are combining members running different MySQL versions. The performance_schema.replication_group_members table is used for monitoring the status of the different server ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-status-variables.html
MySQL 8.0 supports one status variable providing information about Group Replication. This variable is described here: group_replication_primary_member Shows the primary member's UUID when the group is operating in single-primary mode. If the group ...
https://dev.mysql.com/doc/refman/8.0/en/handler.html
HANDLER makes it easier to port to MySQL applications that use a low-level ISAM-like interface. HANDLER tbl_name OPEN [ [AS] alias] HANDLER tbl_name READ index_name { = | <= | >= | < | > } (value1,value2,...) [ WHERE where_condition ] [LIMIT ... ] ...
https://dev.mysql.com/doc/refman/8.0/en/if.html
[ELSE statement_list] END IF The IF statement for stored programs implements a basic conditional construct. Note There is also an IF() function, which differs from the IF statement described here. The IF statement can have THEN, ELSE, and ELSEIF ...