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https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-tablestats-table.html
The INNODB_SYS_TABLESTATS table provides a view of low-level status information about InnoDB tables. This data is used by the MySQL optimizer to calculate which index to use when querying an InnoDB table. InnoDB tables are represented in this view ...This information is derived from in-memory data structures rather than data stored on ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-limitations-storage-engines.html
(This is currently supported only by MyISAM.) In addition, ALTER TABLE ... CREATE TABLE and ALTER TABLE statements that would cause a user-partitioned NDB table not to meet either or both of the following two requirements are not permitted, and fail ... The following limitations apply to the use of storage engines with user-defined partitioning of ...
https://dev.mysql.com/doc/refman/5.7/en/corrupted-myisam-tables.html
Even though the MyISAM table format is very reliable (all changes to a table made by an SQL statement are written before the statement returns), you can still get corrupted tables if any of the following events occur: The mysqld process is killed ...An unexpected computer shutdown occurs (for example, the computer is turned ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-show-tables.html
ndb_show_tables displays a list of all NDB database objects in the cluster. By default, this includes not only both user-created tables and NDB system tables, but NDB-specific indexes, internal triggers, and NDB Cluster Disk Data objects as well.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-memory-summary-tables.html
Memory summary tables do not contain timing information because memory events are not timed. Example memory event summary information: mysql> SELECT * FROM performance_schema.memory_summary_global_by_event_name WHERE EVENT_NAME = ...Operation counts ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-stage-summary-tables.html
The Performance Schema maintains tables for collecting current and recent stage events, and aggregates that information in summary tables. Section 25.12.5, “Performance Schema Stage Event Tables” describes the events on which stage summaries ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-transaction-summary-tables.html
The Performance Schema maintains tables for collecting current and recent transaction events, and aggregates that information in summary tables. Section 25.12.7, “Performance Schema Transaction Tables” describes the events on which transaction ...Example transaction event summary information: mysql> SELECT * FROM performance_schema.events_transactions_summary_global_by_event_name LIMIT 1\G *************************** ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-table-privileges-table.html
The TABLE_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. TABLE_CATALOG The name of the catalog to which the table belongs. TABLE_SCHEMA The name of the schema ...The output does not list GRANT OPTION as a separate row with PRIVILEGE_TYPE='GRANT ...
https://dev.mysql.com/doc/refman/5.7/en/tracing-example.html
Next, for every table in the query, we estimate the cost of, and number of records returned by, a table scan or a range access. "resulting_clause_is_simple": true, "resulting_clause": "`test`.`alias1`.`col_int_key`" } /* clause_processing */ }, The ...Now we can examine the trace, whose first column (QUERY), containing the original statement to be traced, is shown here: SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE\G *************************** ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-table-statistics-with-buffer.html
These views summarize table statistics, including InnoDB buffer pool statistics. By default, rows are sorted by descending total wait time (tables with most contention first). The schema_table_statistics_with_buffer and ...