Search Results
https://dev.mysql.com/doc/heatwave/en/mys-hw-lakehouse-load-event-based.html
Once an event for an external file location is emitted due to a change to an object, Lakehouse automatically refreshes the data into the external table. Event-based incremental load automates the process of updating external tables based on changes ... As of MySQL 9.4.1, you can load data from Object Storage by using event-based incremental ...
https://dev.mysql.com/doc/refman/8.4/en/metadata-locking.html
Metadata locking applies not just to tables, but also to schemas, stored programs (procedures, functions, triggers, scheduled events), tablespaces, user locks acquired with the GET_LOCK() function (see Section 14.14, “Locking Functions”), and ...
https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-3.html
This had an adverse effect on queries using joins on InnoDB tables. InnoDB: InnoDB did not allow updating a REDUNDANT table column that was altered with NULL as the default value using the INSTANT algorithm. (Bug #36341532) InnoDB: Redesigned the ...
https://dev.mysql.com/doc/refman/8.4/en/audit-log-file-formats.html
The MySQL server calls the audit log plugin to write an audit record to its log file whenever an auditable event occurs. <AUDIT_RECORD> <TIMESTAMP>2019-10-03T14:09:38 UTC</TIMESTAMP> <RECORD_ID>6_2019-10-03T14:06:33</RECORD_ID> <NAME>Query</NAME> ...Typically the first audit record written after plugin startup contains the server description and startup ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-system-variables.html
Even when the Performance Schema is disabled, it continues to populate the global_variables, session_variables, global_status, and session_status tables. This occurs as necessary to permit the results for the SHOW VARIABLES and SHOW STATUS ...The ...
https://dev.mysql.com/doc/refman/8.4/en/update.html
UPDATE is a DML statement that modifies rows in a table. An UPDATE statement can start with a WITH clause to define common table expressions accessible within the UPDATE. Single-table syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference SET ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-online-ddl-performance.html
Online DDL improves several aspects of MySQL operation: Applications that access the table are more responsive because queries and DML operations on the table can proceed while the DDL operation is in progress. An exclusive metadata lock on the ...
https://dev.mysql.com/doc/refman/8.4/en/partitioning-limitations-partitioning-keys-unique-keys.html
The rule governing this relationship can be expressed as follows: All columns used in the partitioning expression for a partitioned table must be part of every unique key that the table may have. In other words, every unique key on the table must ...
https://dev.mysql.com/doc/mysql-cluster-manager/8.4/en/mcm-restore-cluster.html
To cause indexes to be ignored when restoring the table data, use the --disable-indexes option. When the --epoch option (short form: -e) is used, epoch information is restored to the cluster replication status table (mysql.ndb_apply_status), which ...Stop the cluster using stop cluster, then restart it using start cluster with the --initial option, which causes the data node file systems to be ...
https://dev.mysql.com/doc/refman/8.4/en/internal-locking.html
This section discusses internal locking; that is, locking performed within the MySQL server itself to manage contention for table contents by multiple sessions. Row-Level Locking Table-Level Locking Choosing the Type of Locking Row-Level Locking ...