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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-session-account-connect-attrs-table.html
For descriptions of common attributes, see Section 29.12.9, “Performance Schema Connection Attribute Tables”. The session_account_connect_attrs table contains connection attributes only for the current session, and other sessions associated with ... Application programs can provide key-value connection attributes to be passed to the server at connect ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-session-connect-attrs-table.html
For descriptions of common attributes, see Section 29.12.9, “Performance Schema Connection Attribute Tables”. To see connection attributes only for the current session, and other sessions associated with the session account, use the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-consumers-table.html
The setup_consumers table has these indexes: Primary key on (NAME) TRUNCATE TABLE is not permitted for the setup_consumers table. For detailed information about the effect of enabling different consumers, see Section 29.4.7, “Pre-Filtering by ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-variables-info-table.html
The variables_info table shows, for each system variable, the source from which it was most recently set, and its range of values. VARIABLE_SOURCE The source from which the variable was most recently set: COMMAND_LINE The variable was set on the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-repair-table.html
When used on a corrupted or otherwise damaged table, it is possible for the REPAIR TABLE statement to delete rows that cannot be recovered. However, any such modifications of table data performed by this statement are not replicated, which can ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-optimization.html
Note A limitation on UPDATE and DELETE statements that use a subquery to modify a single table is that the optimizer does not use semijoin or materialization subquery optimizations. As a workaround, try rewriting them as multiple-table UPDATE and ...
https://dev.mysql.com/doc/refman/8.0/en/table-corruption.html
If you have started mysqld with the myisam_recover_options system variable set, MySQL automatically checks and tries to repair MyISAM tables if they are marked as 'not closed properly' or 'crashed'. If this happens, MySQL writes an entry in the ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-migration.html
To move databases in a binary format from Unix to Windows or from Windows to Unix, create all databases and tables using lowercase names. In addition, MySQL Enterprise Backup can create compressed backup files, and back up subsets of tables. This ...MySQL Enterprise Backup The MySQL Enterprise Backup product lets you back up a running MySQL database with minimal disruption to operations while producing a consistent snapshot of the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-ndb-transid-mysql-connection-map-table.html
For this table to be created, the MySQL Server must be a binary supplied with the NDB Cluster distribution, or one built from the NDB Cluster sources with NDB storage engine support enabled. The ndb_transid_mysql_connection_map table provides a ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-memory-tables.html
Consider using MEMORY tables for noncritical data that is accessed often, and is read-only or rarely updated. Benchmark your application against equivalent InnoDB or MyISAM tables under a realistic workload, to confirm that any additional ...B-tree ...