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https://dev.mysql.com/doc/refman/5.7/en/explain-output.html
EXPLAIN returns a row of information for each table used in the SELECT statement. It lists the tables in the output in the order that MySQL would read them while processing the statement. This means that MySQL reads a row from the first table, and ... The EXPLAIN statement provides information about how MySQL executes ...
https://dev.mysql.com/doc/refman/5.7/en/database-count-limit.html
The underlying file system may have a limit on the number of files that represent tables. The underlying file system may have a limit on the number of directories.
https://dev.mysql.com/doc/refman/5.7/en/group-replication-replication-group-members.html
The performance_schema.replication_group_members table is used for monitoring the status of the different server instances that are members of the group. The information in the table is updated whenever there is a view change, for example when the ...At that point, servers exchange some of their metadata to synchronize themselves and continue to cooperate ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-compression.html
This section provides information about the InnoDB table compression and InnoDB page compression features. Using the compression features of InnoDB, you can create tables where the data is stored in compressed form. The benefits are amplified for ...The page compression feature is referred to as transparent page ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-arbitrator-validity-detail.html
The arbitrator_validity_detail table shows the view that each data node in the cluster has of the arbitrator. All nodes should show the same arbitrator and arb_ticket values as well as the same arb_state value. Possible arb_state values are ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-arbitrator-validity-summary.html
The arbitrator_validity_summary table provides a composite view of the arbitrator with regard to the cluster's data nodes. If it has more than 1 row for longer than a few moments, then either not all nodes are connected to the arbitrator, or all ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-counters.html
The counters table provides running totals of events such as reads and writes for specific kernel blocks and data nodes. The counters table contains the following columns: node_id The data node ID block_name Name of the associated NDB kernel block ...Counts are kept from the most recent node start or restart; a node start or restart resets all counters on that ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-cpustat.html
The cpustat table provides per-thread CPU statistics gathered each second, for each thread running in the NDB kernel.
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-dict-obj-types.html
The dict_obj_types table is a static table listing possible dictionary object types used in the NDB kernel. The dict_obj_types table contains the following columns: type_id The type ID for this type type_name The name of this type . These are the ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-error-messages.html
The error_messages table provides information about The error_messages table contains the following columns: error_code Numeric error code error_description Description of error error_status Error status code error_classification Error ...This is ...