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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-connection-status-table.html
This table shows the current status of the I/O thread that handles the replica's connection to the source, information on the last transaction queued in the relay log, and information on the transaction currently being queued in the relay log. The ...It contains values that change during the connection, whereas replication_connection_configuration contains values which define how the replica connects to the source and that remain constant during the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-group-member-stats-table.html
The replication_group_member_stats table has these columns: CHANNEL_NAME Name of the Group Replication channel VIEW_ID Current view identifier for this group. This has a different value for each member in the group. This also serves as a key because ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-group-members-table.html
This table shows network and status information for replication group members. The replication_group_members table has these columns: CHANNEL_NAME Name of the Group Replication channel. The network addresses shown are the addresses used to connect ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-user-variable-tables.html
The Performance Schema provides a user_variables_by_thread table that exposes user-defined variables. The user_variables_by_thread table has these columns: THREAD_ID The thread identifier of the session in which the variable is defined. The ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-tables-with-full-table-scans.html
These views display which tables are being accessed with full table scans. The schema_tables_with_full_table_scans and x$schema_tables_with_full_table_scans views have these columns: object_schema The schema name. rows_full_scanned The total number ...
https://dev.mysql.com/doc/refman/8.0/en/firewall-reference.html
For information about MySQL Enterprise Firewall Information Schema and Performance Schema tables, see Section 28.7, “INFORMATION_SCHEMA MySQL Enterprise Firewall Tables”, and Section 29.12.17, “Performance Schema Firewall Tables”, ...When ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-blob-tool.html
This tool can be used to check for and remove orphaned BLOB column parts from NDB tables, as well as to generate a file listing any orphaned parts. It is sometimes useful in diagnosing and repairing corrupted or damaged NDB tables containing BLOB ...These options cause ndb_blob_tool to check for orphaned BLOB parts, remove any orphaned BLOB parts, and generate a dump file listing orphaned BLOB parts, respectively, and are described in more detail later in this ...
https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-usage-differences.html
Use of a data dictionary-enabled MySQL server entails some operational differences compared to a server that does not have a data dictionary: Previously, enabling the innodb_read_only system variable prevented creating and dropping tables only for ...The same principle applies to other table operations that require modifying data dictionary ...
https://dev.mysql.com/doc/refman/8.0/en/information-functions.html
Beginning with MySQL 8.0.34, this function can be used for the default value of a VARCHAR or TEXT column, as shown in the following CREATE TABLE statement: CREATE TABLE t (c VARCHAR(288) DEFAULT (CURRENT_USER())); DATABASE() Returns the default ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-check-constraints-table.html
As of MySQL 8.0.16, CREATE TABLE permits the core features of table and column CHECK constraints, and the CHECK_CONSTRAINTS table provides information about these constraints. The CHECK_CONSTRAINTS table has these columns: CONSTRAINT_CATALOG The ...