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https://dev.mysql.com/doc/connector-j/en/connector-j-usagenotes-troubleshooting.html
16.6: Updating a table that contains a primary key that is either FLOAT or compound primary key that uses FLOAT fails to update the table and raises an exception. The security manager on the MySQL server uses its grant tables to determine whether a ... This section explains the symptoms and resolutions for the most commonly encountered issues with applications using MySQL ...
https://dev.mysql.com/doc/refman/8.4/en/char.html
The length of a CHAR column is fixed to the length that you declare when you create the table. See Section 10.4.7, “Limits on Table Column Count and Row Size”. The following table illustrates the differences between CHAR and VARCHAR by showing ... The CHAR and VARCHAR types are similar, but differ in the way they are stored and ...
https://dev.mysql.com/doc/refman/8.4/en/charset-collation-effect.html
latin1_swedish_ci latin1_german1_ci latin1_german2_ci Muffler Muffler Müller MX Systems Müller Muffler Müller MX Systems MX Systems MySQL MySQL MySQL The character that causes the different sort orders in this example is ü (German ...
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-storage-engines.html
Where can I obtain complete documentation for MySQL storage engines? See Chapter 18, Alternative Storage Engines. The disabled_storage_engines configuration option defines which storage engines cannot be used to create tables or tablespaces. MySQL ...Where can I obtain complete documentation for MySQL storage engines? ...
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-by-handling.html
To tell MySQL to accept the query, you can use the ANY_VALUE() function: SELECT name, ANY_VALUE(address), MAX(age) FROM t GROUP BY name; Alternatively, disable ONLY_FULL_GROUP_BY. SQL-92 and earlier does not permit queries for which the select ...
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 ...