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https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-dict-obj-tree.html
The dict_obj_tree table provides a tree-based view of table information from the dict_obj_info table. This means that you must know the name of any tablespace or log file group associated with a given table, or obtain this information from SHOW ...
https://dev.mysql.com/doc/refman/8.0/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 ...
https://dev.mysql.com/doc/refman/8.0/en/sys-sys-config.html
This table contains sys schema configuration options, one row per option. Configuration changes made by updating this table persist across client sessions and server restarts. The sys_config table has these columns: variable The configuration ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-online-add-node-remarks.html
The ability to add new nodes online includes a means to reorganize NDBCLUSTER table data and indexes so that they are distributed across all data nodes, including the new ones, by means of the ALTER TABLE ... However, it is not possible to perform ...Table reorganization of both in-memory and Disk Data tables is ... This section provides general information about the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-cmp-table.html
The INNODB_CMP and INNODB_CMP_RESET tables provide status information on operations related to compressed InnoDB tables. The INNODB_CMP and INNODB_CMP_RESET tables have these columns: PAGE_SIZE The compressed page size in bytes. row ...COMPRESS_OPS ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-host-cache-table.html
The host_cache_size system variable controls the size of the host cache, as well as the size of the host_cache table. Because the host_cache table exposes the contents of the host cache, it can be examined using SELECT statements. The host_cache ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-log-status-table.html
The log_status table provides information that enables an online backup tool to copy the required log files without locking those resources for the duration of the copy process. When the log_status table is queried, the server blocks logging and ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-metadata-locks-table.html
Metadata locking applies not just to tables, but also to schemas, stored programs (procedures, functions, triggers, scheduled events), tablespaces, user locks acquired with the GET_LOCK() function (see Section 14.14, “Locking Functions”), and ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-socket-instances-table.html
The socket_instances table provides a real-time snapshot of the active connections to the MySQL server. The table contains one row per TCP/IP or Unix socket file connection. Information available in this table provides a real-time snapshot of the ...row *************************** EVENT_NAME: wait/io/socket/sql/server_unix_socket OBJECT_INSTANCE_BEGIN: 4316619408 THREAD_ID: 1 SOCKET_ID: 16 IP: PORT: 0 STATE: ACTIVE *************************** ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-socket-summary-tables.html
These socket summary tables aggregate timer and byte count information for socket operations: socket_summary_by_event_name: Aggregate timer and byte count statistics generated by the wait/io/socket/* instruments for all socket I/O operations, per ...socket_summary_by_instance: Aggregate timer and byte count statistics generated by the wait/io/socket/* instruments for all socket I/O operations, per socket ...