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https://dev.mysql.com/doc/refman/5.7/en/partitioning-hash.html
You should also keep in mind that this expression is evaluated each time a row is inserted or updated (or possibly deleted); this means that very complex expressions may give rise to performance issues, particularly when performing operations (such ... Partitioning by HASH is used primarily to ensure an even distribution of data among a predetermined number of ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-management-range-list.html
Adding and dropping of range and list partitions are handled in a similar fashion, so we discuss the management of both sorts of partitioning in this section. For information about working with tables that are partitioned by hash or key, see ...
https://dev.mysql.com/doc/refman/5.7/en/create-event.html
This is an example of a minimal CREATE EVENT statement: CREATE EVENT myevent ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO UPDATE myschema.mytable SET mycol = mycol + 1; The previous statement creates an event named myevent. It specifies ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-enterprise-backup.html
Restore backup of s2 onto the host for s3: s3> mysqlbackup --defaults-file=/etc/my.cnf \ --datadir=/var/lib/mysql \ --backup-image=/backups/my.mbi_2206_1429 \ --backup-dir=/tmp/restore_`date +%d%m_%H%M` copy-back-and-apply-log Note The command above ... MySQL Enterprise Backup is a commercially-licensed backup utility for MySQL Server, available with MySQL Enterprise ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-events-table.html
EXECUTE_AT For a one-time event, this is the DATETIME value specified in the AT clause of the CREATE EVENT statement used to create the event, or of the last ALTER EVENT statement that modified the event. This is displayed as a DATETIME value, and ... The EVENTS table provides information about Event Manager events, which are discussed in Section 23.4, “Using the Event ...
https://dev.mysql.com/doc/refman/5.7/en/json.html
BLOB BIT OPAQUE DATETIME TIME DATE BOOLEAN ARRAY OBJECT STRING INTEGER, DOUBLE NULL For JSON values of the same precedence, the comparison rules are type specific: BLOB The first N bytes of the two values are compared, where N is the number of bytes ...The JSON data type provides these advantages over storing JSON-format strings in a string column: Automatic validation of JSON documents stored in JSON ...
https://dev.mysql.com/doc/refman/5.7/en/mysqlbinlog-row-events.html
These correspond to events with the WRITE_ROWS_EVENT, UPDATE_ROWS_EVENT, and DELETE_ROWS_EVENT type codes. # at 302 #080828 15:03:08 server id 1 end_log_pos 356 Update_rows: table id 17 flags: STMT_END_F BINLOG ' ... The following examples ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-columns-range.html
RANGE COLUMNS partitioning columns are not restricted to integer columns; string, DATE and DATETIME columns can also be used as partitioning columns. Range columns partitioning is similar to range partitioning, but enables you to define partitions ...
https://dev.mysql.com/doc/refman/5.7/en/time-zone-support.html
The session time zone setting does not affect values displayed by functions such as UTC_TIMESTAMP() or values in DATE, TIME, or DATETIME columns. If you want locale-specific arithmetic for DATE, TIME, or DATETIME values, convert them to UTC, perform ... This section describes the time zone settings maintained by MySQL, how to load the system tables required for named time support, how to stay current with time zone changes, and how to enable leap-second ...
https://dev.mysql.com/doc/refman/5.7/en/data-type-defaults.html
This means, for example, that you cannot set the default for a date column to be the value of a function such as NOW() or CURRENT_DATE. The exception is that, for TIMESTAMP and DATETIME columns, you can specify CURRENT_TIMESTAMP as the default. See ... Data type specifications can have explicit or implicit default ...