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https://dev.mysql.com/doc/refman/5.7/en/information-schema-introduction.html
INFORMATION_SCHEMA provides access to database metadata, information about the MySQL server such as the name of a database or table, the data type of a column, or access privileges. Other terms that are sometimes used for this information are data ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-ndb-transid-mysql-connection-map-table.html
The ndb_transid_mysql_connection_map table provides a mapping between NDB transactions, NDB transaction coordinators, and MySQL Servers attached to an NDB Cluster as API nodes. This information is used when populating the server_operations and ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-optimization.html
Applications that monitor databases may make frequent use of INFORMATION_SCHEMA tables. Certain types of queries for INFORMATION_SCHEMA tables can be optimized to execute more quickly. The goal is to minimize file operations (for example, scanning ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-views-table.html
You must have the SHOW VIEW privilege to access this table. The VIEWS table has these columns: TABLE_CATALOG The name of the catalog to which the view belongs. TABLE_SCHEMA The name of the schema (database) to which the view belongs. VIEW_DEFINITION ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-analyze-table-complexity.html
ANALYZE TABLE complexity for InnoDB tables is dependent on: The number of pages sampled, as defined by innodb_stats_persistent_sample_pages. The number of indexed columns in a table The number of partitions. If a table has no partitions, the number ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-configuring-io-capacity.html
The InnoDB master thread and other threads perform various tasks in the background, most of which are I/O related, such as flushing dirty pages from the buffer pool and writing changes from the change buffer to the appropriate secondary indexes.
https://dev.mysql.com/doc/refman/5.7/en/innodb-file-format-identifying.html
If you enable a different file format using the innodb_file_format configuration option, the change only applies to newly created tables. Also, when you create a new table, the tablespace containing the table is tagged with the “earliest” or ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-transactions.html
INNODB_LOCKS: Each transaction in InnoDB that is waiting for another transaction to release a lock (INNODB_TRX.TRX_STATE is LOCK WAIT) is blocked by exactly one blocking lock request. That blocking lock request is for a row or table lock held by ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-linux-native-aio.html
InnoDB uses the asynchronous I/O subsystem (native AIO) on Linux to perform read-ahead and write requests for data file pages. This behavior is controlled by the innodb_use_native_aio configuration option, which applies to Linux systems only and is ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-security.html
Caution Consult this section before deploying the daemon_memcached plugin on a production server, or even on a test server if the MySQL instance contains sensitive data. Because memcached does not use an authentication mechanism by default, and the ...