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https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-troubleshoot.html
Attempting to insert a NULL value into a NOT NULL column causes the INSERT to fail, which may only become evident after you reinitialize the daemon_memcached plugin to apply changes to the innodb_memcache.containers table. If cas_column and ... This ...
https://dev.mysql.com/doc/refman/5.7/en/rewriter-query-rewrite-plugin-usage.html
row *************************** id: 1 pattern: SELECT ? pattern_database: NULL replacement: SELECT ? + 1 enabled: YES message: NULL pattern_digest: NULL normalized_pattern: NULL The rule specifies a pattern template indicating which SELECT ... To ...
https://dev.mysql.com/doc/refman/5.7/en/assignment-operators.html
Table 12.6 Assignment Operators Name Description := Assign a value = Assign a value (as part of a SET statement, or as part of the SET clause in an UPDATE statement) := Assignment operator. Causes the user variable on the left hand side of the ...
https://dev.mysql.com/doc/refman/5.7/en/date-calculations.html
You determine which animals these are by checking whether the death value is NULL. MySQL provides several functions that you can use to perform calculations on dates, for example, to calculate ages or extract parts of dates. To determine how many ...
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/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/x-plugin-options-system-variables.html
mysqlx_ssl_cipher Command-Line Format --mysqlx-ssl-cipher=name System Variable mysqlx_ssl_cipher Scope Global Dynamic No Type String Default Value NULL The mysqlx_ssl_cipher system variable is like ssl_cipher, except that it applies to X Plugin ...
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/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 ...