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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 ...
https://dev.mysql.com/doc/refman/8.0/en/index-preloading.html
If there are enough blocks in a key cache to hold blocks of an entire index, or at least the blocks corresponding to its nonleaf nodes, it makes sense to preload the key cache with index blocks before starting to use it. Preloading enables you to ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-administrable-role-authorizations-table.html
The ADMINISTRABLE_ROLE_AUTHORIZATIONS table (available as of MySQL 8.0.19) provides information about which roles applicable for the current user or role can be granted to other users or roles. The ADMINISTRABLE_ROLE_AUTHORIZATIONS table has these ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-applicable-roles-table.html
The APPLICABLE_ROLES table (available as of MySQL 8.0.19) provides information about the roles that are applicable for the current user. The APPLICABLE_ROLES table has these columns: USER The user name part of the current user account. GRANTEE The ...