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https://dev.mysql.com/doc/refman/8.0/en/manual-info.html
The MySQL Database Software is under constant development, and the Reference Manual is updated frequently as well. This manual is not intended for use with older versions of the MySQL software due to the many functional and other differences between ... This is the Reference Manual for the MySQL Database System, version 8.0, through release ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-innodb-replicaset-introduction.html
This chapter introduces MySQL InnoDB ReplicaSet, which combines MySQL technologies to enable you to deploy and administer Chapter 19, Replication. An InnoDB ReplicaSet consists of at least two MySQL Server instances, and it provides all of the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-privilege-checks.html
The PRIVILEGE_CHECKS_USER account provides an additional layer of security in situations such as these: You are replicating between a server instance on your organization's network, and a server instance on another network, such as an instance ...
https://dev.mysql.com/doc/refman/8.0/en/tracing-example.html
Next, for every table in the query, we estimate the cost of, and number of records returned by, a table scan or a range access. Normally, greedy search is used, but since the statement uses a straight join, only the requested order is explored, and ...Now we can examine the trace, whose first column (QUERY), containing the original statement to be traced, is shown here: SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE\G *************************** ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-statements-current-table.html
END_EVENT_ID This column is set to NULL when the event starts and updated to the thread current event number when the event ends. The TIMER_START and TIMER_END values indicate when event timing started and ended. If an event has not finished, ...For ...The table stores one row per thread showing the current status of the thread's most recent monitored statement event, so there is no system variable for configuring the table ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-fine-tuning.html
Most full-text variables described in this section must be set at server startup time. Note Minimum and maximum word length full-text parameters do not apply to FULLTEXT indexes created using the ngram parser. For example, to make two-character ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-change-buffer.html
Similarly, deletes and updates may affect secondary index pages that are not adjacently located in an index tree. Merging cached changes at a later time, when affected pages are read into the buffer pool by other operations, avoids substantial ...
https://dev.mysql.com/doc/refman/8.0/en/replication-gtids-auto-positioning.html
This method is efficient and only takes a significant amount of time if the replica is behind the source by a large number of binary log files. GTIDs replace the file-offset pairs previously required to determine points for starting, stopping, or ...When GTIDs are in use, all the information that the replica needs for synchronizing with the source is obtained directly from the replication data ...
https://dev.mysql.com/doc/refman/8.0/en/stored-objects-security.html
Stored programs (procedures, functions, triggers, and events) and views are defined prior to use and, when referenced, execute within a security context that determines their privileges. The privileges applicable to execution of a stored object are ...The DEFINER Attribute The SQL SECURITY Characteristic Examples Orphan Stored Objects Risk-Minimization Guidelines The DEFINER Attribute A stored object definition can include a DEFINER attribute that names a MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/upgrade-prerequisites.html
In-place upgrade to MySQL 8.0 is not supported if tables contain old temporal columns in pre-5.6.4 format (TIME, DATETIME, and TIMESTAMP columns without support for fractional seconds precision). (Alternatively, let the 8.0 server add those ...The ... Before upgrading to the latest MySQL 8.0 release, ensure the upgrade readiness of your current MySQL 5.7 or MySQL 8.0 server instance by performing the preliminary checks described ...