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https://dev.mysql.com/doc/refman/9.7/en/performance-schema-ndb-replication-applier-status-table.html
NDBCLUSTER exposes its internal replication applier state for observation using global status variables such as Ndb_replica_max_replicated_epoch and Ndb_api_trans_start_count_replica, but these values reflect the state of the default replication ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-replication-group-member-stats-table.html
The replication_group_member_stats table has these columns: CHANNEL_NAME Name of the Group Replication channel VIEW_ID Current view identifier for this group. This has a different value for each member in the group. This also serves as a key because ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-replication-group-members-table.html
This table shows network and status information for replication group members. The network addresses shown are the addresses used to connect clients to the group, and should not be confused with the member's internal group communication address ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-socket-instances-table.html
The socket_instances table provides a real-time snapshot of the active connections to the MySQL server. The table contains one row per TCP/IP or Unix socket file connection. Information available in this table provides a real-time snapshot of the ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-statement-histogram-summary-tables.html
The Performance Schema maintains statement event summary tables that contain information about minimum, maximum, and average statement latency (see Section 29.12.20.3, “Statement Summary Tables”). To permit assessment at a more fine-grained ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-wait-summary-tables.html
The Performance Schema maintains tables for collecting current and recent wait events, and aggregates that information in summary tables. Section 29.12.4, “Performance Schema Wait Event Tables” describes the events on which wait summaries are ...
https://dev.mysql.com/doc/refman/9.7/en/primary-key-optimization.html
The primary key for a table represents the column or set of columns that you use in your most vital queries. Query performance benefits from the NOT NULL optimization, because it cannot include any NULL values. With the InnoDB storage engine, the ...
https://dev.mysql.com/doc/refman/9.7/en/range-optimization.html
The range access method uses a single index to retrieve a subset of table rows that are contained within one or several index value intervals. The following sections describe conditions under which the optimizer uses range access. Additionally, for ...
https://dev.mysql.com/doc/refman/9.7/en/replica-logs-status.html
A replica server creates two replication metadata repositories, the connection metadata repository and the applier metadata repository. If binary log file position based replication is in use, when the replica restarts, it reads the two ...
https://dev.mysql.com/doc/refman/9.7/en/replication-bugs.html
When you have determined that there is no user error involved, and replication still either does not work at all or is unstable, it is time to send us a bug report. We need to obtain as much information as possible from you to be able to track down ...