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https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-resources.html
DISK_OPERATIONS: If a log file group is allocated, the size of the undo log buffer is used to set the size of this resource. This resource is used only to allocate the undo log buffer for an undo log file group; there can only be one such group.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-options-variables.html
(This is the default behavior.) Proximity is determined as follows: Start with the value set for the Group parameter (default 55). Assuming the default value for Group, the effective value for data nodes on same host as the API node is 54, and for ... This section provides information about MySQL server options, server and status variables that are specific to NDB ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-params-other.html
Group: Used for group proximity; smaller value is interpreted as being closer. Group: Used for group proximity; smaller value is interpreted as being closer. The listings in this section provide information about parameters used in the [computer], ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-ndb-sync-excluded-objects-table.html
row *************************** SCHEMA_NAME: NULL NAME: lg1 TYPE: LOGFILE GROUP REASON: Injected failure *************************** 2. This table provides information about NDB database objects which cannot be automatically synchronized between ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-quick-start.html
Tables in the performance_schema database can be grouped according to the type of information in them: Current events, event histories and summaries, object instances, and setup (configuration) information. For detailed information about the tables ... This section briefly introduces the Performance Schema with examples that show how to use ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-applier-status-by-worker-table.html
This table provides details of the transactions handled by applier threads on a replica or Group Replication group member. The number of applier threads on a replica or Group Replication group member is set by the replica_parallel_workers or ...For ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-tables.html
Tables that contain information about Group Replication members: replication_group_members: Provides network and status information for group members. replication_group_member_stats: Provides statistical information about group members and ...This ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-summary-tables.html
Each statement summary table has one or more grouping columns to indicate how the table aggregates events. (The DIGEST_TEXT column contains the corresponding normalized statement digest text, but is neither a grouping nor a summary column. The ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-summary-tables.html
The tables in this group summarize event data in different ways. Each summary table has grouping columns that determine how to group the data to be aggregated, and summary columns that contain the aggregated values. Tables that summarize events in ... Summary tables provide aggregated information for terminated events over ...
https://dev.mysql.com/doc/refman/8.0/en/semijoins.html
It must not contain any aggregate functions (whether it is explicitly or implicitly grouped). A GROUP BY clause is permitted but ignored, unless the subquery also contains one or more aggregate functions. FirstMatch: When scanning the inner tables ... A semijoin is a preparation-time transformation that enables multiple execution strategies such as table pullout, duplicate weedout, first match, loose scan, and ...