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https://dev.mysql.com/innodb-memcached-porting-mysql.html
Consider these aspects of memcached applications when adapting an existing MySQL schema or application to use the daemon_memcached plugin: memcached keys cannot contain spaces or newlines, because these characters are used as separators in the ...
https://dev.mysql.com/partitioning-limitations.html
This section discusses current restrictions and limitations on MySQL partitioning support. The following constructs are not permitted in partitioning expressions: Stored procedures, stored functions, UDFs, or plugins. For a list of SQL functions ...
https://dev.mysql.com/performance-schema-optimization.html
Applications that monitor databases may make frequent use of Performance Schema tables. To write queries for these tables most efficiently, take advantage of their indexes. For example, include a WHERE clause that restricts retrieved rows based on ...
https://dev.mysql.com/sys-ps-thread-id.html
in_connection_id BIGINT UNSIGNED: The ID of the connection for which to return the thread ID. Note As of MySQL 8.0.16, ps_thread_id() is deprecated and will be removed in a future MySQL version. Applications that use it should be migrated to use ...
https://dev.mysql.com/sys-schema-auto-increment-columns.html
For example, for a column with a bigint(20) unsigned column type, the data type is just bigint. This view indicates which tables have AUTO_INCREMENT columns and provides information about those columns, such as the current and maximum column values ...
https://dev.mysql.com/performance-schema-functions.html
PS_CURRENT_THREAD_ID() Returns a BIGINT UNSIGNED value representing the Performance Schema thread ID assigned to the current connection. PS_THREAD_ID(connection_id) Given a connection ID, returns a BIGINT UNSIGNED value representing the Performance ... As of MySQL 8.0.16, MySQL includes built-in SQL functions that format or retrieve Performance Schema data, and that may be used as equivalents for the corresponding sys schema stored ...
https://dev.mysql.com/mysql-cluster-programs-ndb-restore.html
For example, data from a CHAR(20) column can be restored to a column declared as VARCHAR(20), VARCHAR(30), or CHAR(30); data from a MEDIUMINT column can be restored to a column of type INT or BIGINT. For example, you cannot promote an INT column to ... The NDB Cluster restoration program is implemented as a separate command-line utility ndb_restore, which can normally be found in the MySQL bin ...
https://dev.mysql.com/hexadecimal-literals.html
In numeric contexts, MySQL treats a hexadecimal literal like a BIGINT (64-bit integer). Hexadecimal literal values are written using X'val' or 0xval notation, where val contains hexadecimal digits (0..9, A..F). Lettercase of the digits and of any ...
https://dev.mysql.com/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Reserved words are permitted as ...
https://dev.mysql.com/c-api-prepared-statement-data-structures.html
For example, if you use an int variable to supply a value for a BIGINT UNSIGNED column, is_unsigned should be false because int is a signed type. If you use an unsigned int variable to supply a value for a BIGINT column, is_unsigned should be true ... Prepared statements use several data structures: To obtain a statement handler, pass a MYSQL connection handler to mysql_stmt_init(), which returns a pointer to a MYSQL_STMT data ...
Document created the 26/06/2006, last modified the 26/10/2018
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