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https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-memoryusage.html
Querying this table provides information similar to that provided by the ALL REPORT MemoryUsage command in the ndb_mgm client, or logged by ALL DUMP 1000. The memoryusage table contains the following columns: node_id The node ID of this data node.
https://dev.mysql.com/doc/refman/8.0/en/mysql-tzinfo-to-sql.html
The mysql_tzinfo_to_sql program loads the time zone tables in the mysql database. It is used on systems that have a zoneinfo database (the set of files describing time zones). One likely location for these files is the /usr/share/zoneinfo directory ...
https://dev.mysql.com/doc/refman/8.0/en/retrieving-data.html
The SELECT statement is used to pull information from a table. The general form of the statement is: SELECT what_to_select FROM which_table WHERE conditions_to_satisfy; what_to_select indicates what you want to see. This can be a list of columns, ...If it is present, conditions_to_satisfy specifies one or more conditions that rows must satisfy to qualify for ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-table-lock-waits.html
For additional information, see the description of the Performance Schema metadata_locks table at Section 29.12.13.3, “The metadata_locks Table”. The schema_table_lock_waits and x$schema_table_lock_waits views have these columns: object_schema ... These views display which sessions are blocked waiting on metadata locks, and what is blocking ...
https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html
InnoDB does not keep an internal count of rows in a table because concurrent transactions might “see” different numbers of rows at the same time. As of MySQL 8.0.13, SELECT COUNT(*) FROM tbl_name query performance for InnoDB tables is optimized ... This section describes aggregate functions that operate on sets of ...
https://dev.mysql.com/doc/refman/8.0/en/backup-policy.html
This backup operation acquires a global read lock on all tables at the beginning of the dump (using FLUSH TABLES WITH READ LOCK). After that, the dump becomes lock-free and does not disturb reads and writes on the tables. It was assumed earlier that ...A full backup (a snapshot of the data at a point in time) can be done in MySQL with several ...
https://dev.mysql.com/doc/refman/8.0/en/change-master-to.html
If you are using statement-based replication and temporary tables, it is possible for a CHANGE MASTER TO statement following a STOP SLAVE statement to leave behind temporary tables on the replica. You can avoid this in such cases by making sure that ...] CHANGE MASTER TO changes the parameters that the replica server uses for connecting to the source and for reading data from the ...
https://dev.mysql.com/doc/refman/8.0/en/change-replication-filter.html
Names of tables and database not containing any special characters need not be quoted. Values used with REPLICATION_WILD_TABLE and REPLICATION_WILD_IGNORE_TABLE are string expressions, possibly containing (special) wildcard characters, and so must ...Filters set using this statement differ from those set using the server options in two key respects: The statement does not require restarting the server to take effect, only that the replication SQL thread be stopped using STOP REPLICA SQL_THREAD first (and restarted with START REPLICA SQL_THREAD ...
https://dev.mysql.com/doc/refman/8.0/en/create-function-loadable.html
CREATE FUNCTION requires the INSERT privilege for the mysql system schema because it adds a row to the mysql.func system table to register the function. CREATE FUNCTION also adds the function to the Performance Schema user_defined_functions table ...
https://dev.mysql.com/doc/refman/8.0/en/create-spatial-reference-system.html
The resulting data dictionary entry can be inspected using the INFORMATION_SCHEMA ST_SPATIAL_REFERENCE_SYSTEMS table. With CREATE OR REPLACE syntax, any existing SRS definition with the same SRID value is replaced, unless the SRID value is used by ...srs_attribute: { NAME 'srs_name' | DEFINITION 'definition' | ORGANIZATION 'org_name' IDENTIFIED BY org_id | DESCRIPTION 'description' } srid, org_id: 32-bit unsigned integer This statement creates a spatial reference system (SRS) definition and stores it in the data ...