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https://dev.mysql.com/doc/refman/5.7/en/create-table-secondary-indexes.html
row *************************** id: 1 select_type: SIMPLE table: jemp partitions: NULL type: range possible_keys: i key: i key_len: 5 ref: NULL rows: 2 filtered: 100.00 Extra: Using where 1 row in set, 1 warning (0.00 sec) mysql> SHOW WARNINGS\G ...
https://dev.mysql.com/doc/refman/5.7/en/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/doc/refman/5.7/en/keyring-functions-general-purpose.html
If the key cannot be created, the return value is NULL and an error occurs. mysql> SELECT @x; +------+ | @x | +------+ | NULL | +------+ mysql> SELECT keyring_key_generate('x', 'AES', 16) INTO @x; mysql> SELECT @x; +------+ | @x | +------+ | 1 | ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-what-is-new-7-6.html
When the primary key is extended with an additional column or columns, any columns added must be defined as NOT NULL, and no values in any such columns may be changed during the time that the backup is being taken. Beginning with NDB 7.6.19, ... New ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-quick-start.html
row *************************** Table: setup_consumers Create Table: CREATE TABLE `setup_consumers` ( `NAME` varchar(64) NOT NULL, `ENABLED` enum('YES','NO') NOT NULL ) ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8 Table structure is also available ... This section briefly introduces the Performance Schema with examples that show how to use ...
https://dev.mysql.com/doc/refman/5.7/en/show-index.html
row *************************** Table: city Non_unique: 0 Key_name: PRIMARY Seq_in_index: 1 Column_name: ID Collation: A Cardinality: 4188 Sub_part: NULL Packed: NULL Null: Index_type: BTREE Comment: Index_comment: *************************** 2. row ... SHOW {INDEX | INDEXES | KEYS} {FROM | IN} tbl_name [{FROM | IN} db_name] [WHERE expr] SHOW INDEX returns table index ...
https://dev.mysql.com/doc/refman/5.7/en/show-processlist.html
row *************************** Id: 1 User: system user Host: db: NULL Command: Connect Time: 1030455 State: Waiting for master to send event Info: NULL *************************** 2. row *************************** Id: 2 User: system user Host: db: ... SHOW [FULL] PROCESSLIST The MySQL process list indicates the operations currently being performed by the set of threads executing within the ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-applier-status-by-worker-table.html
After STOP SLAVE, the THREAD_ID column becomes NULL, but the WORKER_ID value is preserved. If the replica is not multithreaded, this table shows the status of the applier thread. Otherwise, the replica uses multiple worker threads and a coordinator ...
https://dev.mysql.com/doc/refman/5.7/en/constraint-invalid-data.html
If you try to store NULL into a column that does not take NULL values, an error occurs for single-row INSERT statements. MySQL 5.7.5 and later uses strict SQL mode by default, which treats invalid values such that the server rejects them and aborts ...
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. If the argument is NULL or an empty geometry, the return value is NULL. GeometryN() is deprecated; expect it to be removed in a future MySQL release.