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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/stored-objects-security.html
If a definition omits the DEFINER attribute, the default object definer is the user who creates it. Creating a stored object with a nonexistent DEFINER account creates an orphan object, which may have negative consequences; see Orphan Stored Objects. This account must have the EXECUTE privilege for p1 as well as the UPDATE privilege for the table t1 referenced within the object ... Stored programs (procedures, functions, triggers, ...
https://dev.mysql.com/doc/refman/8.0/en/data-masking-component-usage.html
Creating Views that Display Masked Data If masked data from a table is used for multiple queries, it may be convenient to define a view that produces masked data. To use a dictionary, it must first be added to the masking_dictionaries system table ... Before using MySQL Enterprise Data Masking and De-Identification, install it according to the instructions provided at Section 8.5.2.1, “MySQL Enterprise Data Masking and De-Identification Component ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-file-space.html
In a newly created system tablespace, InnoDB allocates space starting from the first data file. To avoid the issues that come with storing all tables and indexes inside the system tablespace, you can enable the innodb_file_per_table configuration ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-key-caches.html
By default, table indexes are assigned to the main (default) key cache created at the server startup. This feature enables you to assign different table indexes to different key caches. Where there are multiple key caches, the server must know which ... Note As of MySQL 8.0, the compound-part structured-variable syntax discussed here for referring to multiple MyISAM key caches is ...
https://dev.mysql.com/doc/refman/8.0/en/except.html
As with UNION and INTERSECT, either query block can make use of any of SELECT, TABLE, or VALUES. query_expression_body EXCEPT [ALL | DISTINCT] query_expression_body [EXCEPT [ALL | DISTINCT] query_expression_body] [...] query_expression_body: See ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-consumer-filtering.html
For example, if you do not care about historical event information, disable the history consumers: UPDATE performance_schema.setup_consumers SET ENABLED = 'NO' WHERE NAME LIKE '%history%'; The consumer settings in the setup_consumers table form a ...