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https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-buffer-pool-tables.html
Example 14.6 Querying System Data in the INNODB_BUFFER_PAGE Table This query provides an approximate count of pages that contain system data by excluding pages where the TABLE_NAME value is either NULL or includes a slash / or period . The InnoDB ...
https://dev.mysql.com/doc/refman/5.7/en/sys-sys-config.html
The value is NULL if the row has not been changed since the sys schema was installed. (For example, the variable corresponding to the diagnostics.include_raw option is @sys.diagnostics.include_raw.) If the user-defined variable exists in the current ... This table contains sys schema configuration options, one row per ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-blob-tool.html
--connect-string Command-Line Format --connect-string=connection_string Type String Default Value [none] Same as --ndb-connectstring. --database=db_name, -d Command-Line Format --database=name Type String Default Value [none] Specify the database to ... 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 ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-page-compression.html
InnoDB supports page-level compression for tables that reside in file-per-table tablespaces. Page compression is enabled by specifying the COMPRESSION attribute with CREATE TABLE or ALTER TABLE. Supported Platforms Page compression requires sparse ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndbinfo-select-all.html
--connect-string Command-Line Format --connect-string=connection-string Type String Default Value [none] Same as --ndb-connectstring. --defaults-extra-file Command-Line Format --defaults-extra-file=path Type String Default Value [none] Read given ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-introduction.html
MySQL uses the default collation for this character set (utf8_general_ci) for all searches, sorts, comparisons, and other string operations on such columns. Because some MySQL objects are represented as files, searches in INFORMATION_SCHEMA string ... 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 ...
https://dev.mysql.com/doc/refman/5.7/en/encrypted-connection-protocols-ciphers.html
If you set a TLS version parameter to the empty string, encrypted connections cannot be established: tls_version: The server does not permit encrypted incoming connections. MySQL supports multiple TLS protocols and ciphers, and enables configuring ...
https://dev.mysql.com/doc/refman/5.7/en/server-status-variables.html
If the group is operating in multi-primary mode, shows an empty string. The MySQL server maintains many status variables that provide information about its operation. You can view these variables and their values by using the SHOW [GLOBAL | ...
https://dev.mysql.com/doc/refman/5.7/en/time-zone-support.html
As a string indicating an offset from UTC of the form [H]H:MM, prefixed with a + or -, such as '+10:00', '-6:00', or '+05:30'. This section describes the time zone settings maintained by MySQL, how to load the system tables required for named time ...
https://dev.mysql.com/doc/refman/5.7/en/gis-geometrycollection-property-functions.html
If any argument is NULL or the geometry argument is an empty geometry, the return value is NULL. mysql> SET @gc = 'GeometryCollection(Point(1 1),LineString(2 2, 3 3))'; mysql> SELECT ST_AsText(ST_GeometryN(ST_GeomFromText(@gc),1)); ...GeometryN() is ...