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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-accounts-table.html
The accounts table contains a row for each account that has connected to the MySQL server. For each account, the table counts the current and total number of connections. To set the table size explicitly, set the performance_schema_accounts_size ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-hosts-table.html
The hosts table contains a row for each host from which clients have connected to the MySQL server. For each host name, the table counts the current and total number of connections. To set the table size explicitly, set the ...This is NULL for an ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-connection-configuration-table.html
This table shows the configuration parameters used by the replica for connecting to the source. Parameters stored in the table can be changed at runtime with the CHANGE REPLICATION SOURCE TO statement (from MySQL 8.0.23) or CHANGE MASTER TO ...It ...
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/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/replace.html
For information about generated columns, see Section 15.1.20.8, “CREATE TABLE and Generated Columns”. | TABLE table_name} value: {expr | DEFAULT} value_list: value [, value] ... REPLACE works exactly like INSERT, except that if an old row in the ... REPLACE [LOW_PRIORITY | DELAYED] [INTO] tbl_name [PARTITION (partition_name [, partition_name] ...)] [(col_name [, col_name] ...)] { {VALUES | VALUE} (value_list) [, (value_list)] ...
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 ...
https://dev.mysql.com/doc/refman/8.0/en/roles.html
You should keep in mind that this distinction is not immutable; a user with appropriate privileges can lock or unlock roles or (other) users after they have been created. The following list summarizes role-management capabilities provided by MySQL: ...Like user accounts, roles can have privileges granted to and revoked from ...