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https://dev.mysql.com/doc/refman/8.4/en/cursor-restrictions.html
In MySQL, a server-side cursor is materialized into an internal temporary table. Initially, this is a MEMORY table, but is converted to a MyISAM table when its size exceeds the minimum value of the max_heap_table_size and tmp_table_size system ...
https://dev.mysql.com/doc/refman/8.4/en/faqs-replication.html
On the source, issue the following statement to enable the source to begin processing updates again: mysql> UNLOCK TABLES; A.14.5. Thus, when the update of client A makes it to co-source 2, it produces tables that are different from what you have on ... In the following section, we provide answers to questions that are most frequently asked about MySQL ...
https://dev.mysql.com/doc/refman/8.4/en/faqs-storage-engines.html
The disabled_storage_engines configuration option defines which storage engines cannot be used to create tables or tablespaces. MySQL Enterprise Backup does a hot backup of all tables that use the InnoDB storage engine. For tables using MyISAM or ...
https://dev.mysql.com/doc/refman/8.4/en/fulltext-search.html
Full-text indexes can be used only with InnoDB or MyISAM tables, and can be created only for CHAR, VARCHAR, or TEXT columns. A FULLTEXT index definition can be given in the CREATE TABLE statement when a table is created, or added later using ALTER ... MATCH (col1,col2,...) AGAINST (expr [search_modifier]) search_modifier: { IN NATURAL LANGUAGE MODE | IN NATURAL LANGUAGE MODE WITH QUERY EXPANSION | IN BOOLEAN MODE | WITH QUERY EXPANSION } MySQL has support for full-text indexing and searching: A full-text index in MySQL is an index of type ...
https://dev.mysql.com/doc/refman/8.4/en/get-diagnostics.html
For example: mysql> GET DIAGNOSTICS CONDITION 1 @p5 = SCHEMA_NAME, @p6 = TABLE_NAME; mysql> SELECT @p5, @p6; +------+------+ | @p5 | @p6 | +------+------+ | | | +------+------+ In standard SQL, if there are multiple conditions, the first condition ... GET [CURRENT | STACKED] DIAGNOSTICS { statement_information_item [, statement_information_item] ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-bootstrap.html
For the purpose of demonstrating that the server is indeed in a group and that it is able to handle load, create a table and add some content to it. mysql> CREATE DATABASE test; mysql> USE test; mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 TEXT ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-limitations.html
Group Replication cannot be started following a MySQL Server upgrade that uses the MINIMAL option (--upgrade=MINIMAL), which does not upgrade system tables on which the replication internals depend. Note For a group in multi-primary mode, unless you ... Limit on Group Size Limits on Transaction Size The following known limitations exist for Group ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-network-partitioning.html
Detecting Partitions The replication_group_members performance schema table presents the status of each server in the current view from the perspective of this server. The majority of the time the system does not run into partitioning, and therefore ... The group needs to achieve consensus whenever a change that needs to be replicated ...
https://dev.mysql.com/doc/refman/8.4/en/index-merge-optimization.html
This access method merges index scans from a single table only, not scans across multiple tables. AND key_partN = constN Any range condition over the primary key of an InnoDB table. If all columns used in the query are covered by the used indexes, ... The Index Merge access method retrieves rows with multiple range scans and merges their results into ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-init-startup-configuration.html
Note InnoDB does not open all user tables and associated data files at startup. However, InnoDB does check for the existence of tablespace files referenced in the data dictionary. If a tablespace file is not found, InnoDB logs an error and continues ... The first decisions to make about InnoDB configuration involve the configuration of data files, log files, page size, and memory buffers, which should be configured before initializing ...