https://dev.mysql.com/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/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/audit-log-file-formats.html
The timestamp is a UTC value in YYYY-MM-DDThh:mm:ss format indicating the date and time when the audit log plugin opened the file. Example: <RECORD_ID>12_2017-10-16T14:06:33</RECORD_ID> <TIMESTAMP> A string representing a UTC value in ... The MySQL ...
https://dev.mysql.com/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/data-type-defaults.html
See Section 11.3.4, “Automatic Initialization and Updating for TIMESTAMP and DATETIME”. 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 ...
https://dev.mysql.com/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 24.4, “Using the Event ...
https://dev.mysql.com/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/json.html
Partial Updates of JSON Values In MySQL 8.0, the optimizer can perform a partial, in-place update of a JSON column instead of removing the old document and writing the new document in its entirety to the column. This optimization can be performed ...
https://dev.mysql.com/load-data.html
For date and time types, the column is set to the appropriate “zero” value for the type. These are the same values that result if you assign an empty string explicitly to a string, numeric, or date or time type explicitly in an INSERT or UPDATE ...INTO Syntax”.) To write data from a table to a file, use SELECT ...
https://dev.mysql.com/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 ...
