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https://dev.mysql.com/doc/refman/5.7/en/x-plugin-status-variables.html
If the bind has failed, or if the skip_networking option has been used, the value shows UNDEFINED. Mysqlx_errors_unknown_message_type The number of unknown message types that have been received. Mysqlx_notice_other_sent The number of other types of ...
https://dev.mysql.com/doc/refman/5.7/en/proxy-users.html
Suppose that my_auth_plugin returns a user name of employee to the server, based on the content of 'my_auth_string' and perhaps by consulting some external authentication system. If present, the string provides information that helps the plugin ...
https://dev.mysql.com/doc/refman/5.7/en/host-cache.html
Initially, the host name is set to NULL and the flag is false. For permanent failures, the host name remains NULL and the validation flag is set to true. The MySQL server maintains an in-memory host cache that contains information about clients: IP ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-limitations-syntax.html
Attempting to create an index on an NDB table column whose width is greater than 3072 bytes is rejected with ER_TOO_LONG_KEY: Specified key was too long; max key length is 3072 bytes. Attempting to create an index on an NDB table column whose width ... Some SQL statements relating to certain MySQL features produce errors when used with NDB tables, as described in the following list: Temporary ...
https://dev.mysql.com/doc/refman/5.7/en/storage-engines.html
row *************************** Engine: BLACKHOLE Support: YES Comment: /dev/null storage engine (anything you write to it disappears) Transactions: NO XA: NO Savepoints: NO *************************** 5. Blackhole: The Blackhole storage engine ...
https://dev.mysql.com/doc/refman/5.7/en/thread-information.html
row *************************** Id: 1 User: event_scheduler Host: localhost db: NULL Command: Daemon Time: 2756681 State: Waiting on empty queue Info: NULL *************************** 2. To ascertain what your MySQL server is doing, it can be ...
https://dev.mysql.com/doc/refman/5.7/en/where-optimization.html
This is also done for any NOT NULL expression when used with only one table. A table that is used with a WHERE clause on a PRIMARY KEY or a UNIQUE index, where all index parts are compared to constant expressions and are defined as NOT NULL. This ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-statistics-table.html
This can have values A (ascending), D (descending), or NULL (not sorted). That is, the number of indexed characters if the column is only partly indexed, NULL if the entire column is indexed. However, prefix lengths for index specifications in ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-select-all.html
Usage ndb_select_all -c connection_string tbl_name -d db_name [> file_name] Options that can be used with ndb_select_all are shown in the following table. --connect-string Command-Line Format --connect-string=connection_string Type String Default ...
https://dev.mysql.com/doc/refman/5.7/en/gis-format-conversion-functions.html
There are also functions to convert a string from WKT or WKB format to internal geometry format. ST_AsText(g), ST_AsWKT(g) Converts a value in internal geometry format to its WKT representation and returns the string result. mysql> SET @g = ...