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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-users-table.html
The users table contains a row for each user who has connected to the MySQL server. For each user name, the table counts the current and total number of connections. To set the table size explicitly, set the performance_schema_users_size system ...
https://dev.mysql.com/doc/refman/8.0/en/data-size.html
Row Format InnoDB tables are created using the DYNAMIC row format by default. To use a row format other than DYNAMIC, configure innodb_default_row_format, or specify the ROW_FORMAT option explicitly in a CREATE TABLE or ALTER TABLE statement. To ...
https://dev.mysql.com/doc/refman/8.0/en/memory-use.html
For MEMORY tables explicitly created with CREATE TABLE, only the max_heap_table_size system variable determines how large a table can grow, and there is no conversion to on-disk format. If you use a large number of tables, you can create a large ...
https://dev.mysql.com/doc/refman/8.0/en/mysqlshow.html
The mysqlshow client can be used to quickly see which databases exist, their tables, or a table's columns or indexes. If no table is given, all matching tables in the database are shown. If no column is given, all matching columns and column types ...The same information can be obtained by using those statements ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-myisam-bulk-data-loading.html
For a MyISAM table, you can use concurrent inserts to add rows at the same time that SELECT statements are running, if there are no deleted rows in middle of the data file. With some extra work, it is possible to make LOAD DATA run even faster for a ... These performance tips supplement the general guidelines for fast inserts in Section 10.2.5.1, “Optimizing INSERT ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-user-attributes-table.html
The USER_ATTRIBUTES table (available as of MySQL 8.0.21) provides information about user comments and user attributes. The USER_ATTRIBUTES table has these columns: USER The user name portion of the account to which the ATTRIBUTE column value ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-buffer-pool-stats-table.html
The INNODB_BUFFER_POOL_STATS table provides much of the same buffer pool information provided in SHOW ENGINE INNODB STATUS output. For related usage information and examples, see Section 17.15.5, “InnoDB INFORMATION_SCHEMA Buffer Pool Tables”.
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-ft-default-stopword-table.html
The INNODB_FT_DEFAULT_STOPWORD table holds a list of stopwords that are used by default when creating a FULLTEXT index on InnoDB tables. For related usage information and examples, see Section 17.15.4, “InnoDB INFORMATION_SCHEMA FULLTEXT Index ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-clone-tables.html
If the clone plugin is loaded but disabled, the tables are not created. Note The Performance Schema tables described here are available as of MySQL 8.0.17. The following sections describe the Performance Schema tables associated with the clone ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-file-summary-tables.html
The Performance Schema maintains file I/O summary tables that aggregate information about I/O operations. Each file I/O summary table has one or more grouping columns to indicate how the table aggregates events. Event names refer to names of event ...Example file I/O event summary information: mysql> SELECT * FROM performance_schema.file_summary_by_event_name\G ...