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https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-sets.html
Beginning with MySQL 8.0.28, utf8mb3 is also displayed in place of utf8 in columns of Information Schema tables, and in the output of SQL SHOW statements. To determine the pad attribute for a collation, use the INFORMATION_SCHEMA COLLATIONS table, ... This section describes the collations available for Unicode character sets and their differentiating ...
https://dev.mysql.com/doc/refman/8.0/en/create-user.html
It enables authentication, role, SSL/TLS, resource-limit, password-management, comment, and attribute properties to be established for new accounts. Plugin names are stored in the plugin column of the mysql.user system table. Credentials that are ...
https://dev.mysql.com/doc/refman/8.0/en/forcing-innodb-recovery.html
If you encounter a runaway rollback caused by a failing mass import or ALTER TABLE, you can kill the mysqld process and set innodb_force_recovery to 3 to bring the database up without the rollback, and then DROP the table that is causing the runaway ... To investigate database page corruption, you might dump your tables from the database with SELECT ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-consistent-read.html
Consistent read does not work over ALTER TABLE operations that make a temporary copy of the original table and delete the original table when the temporary copy is built. This exception causes the following anomaly: If you update some rows in a ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-start.html
myisam_max_sort_file_size The maximum size of the temporary file that MySQL is permitted to use while re-creating a MyISAM index (during REPAIR TABLE, ALTER TABLE, or LOAD DATA). The following options to mysqld can be used to change the behavior of ...bulk_insert_buffer_size The size of the tree cache used in bulk insert ...
https://dev.mysql.com/doc/refman/8.0/en/temporary-files.html
The optional EXTENDED modifier causes SHOW TABLES to list hidden tables created by failed ALTER TABLE statements. The maximum disk space required is determined by the following expression: (length of what is sorted + sizeof(row pointer)) * number of ... On Unix, MySQL uses the value of the TMPDIR environment variable as the path name of the directory in which to store temporary ...
https://dev.mysql.com/doc/refman/8.0/en/cache-index.html
| ALL } The CACHE INDEX statement assigns table indexes to a specific key cache. However, the implementation assigns all the table's indexes to the cache, so there is no reason to specify anything other than the table name. A key cache must exist ...
https://dev.mysql.com/doc/refman/8.0/en/engine-condition-pushdown-optimization.html
Joins are not directly supported; conditions involving multiple tables are pushed separately where possible. Previously, engine condition pushdown was limited to terms referring to column values from the same table to which the condition was being ... This optimization improves the efficiency of direct comparisons between a nonindexed column and a ...
https://dev.mysql.com/doc/refman/8.0/en/host-cache.html
The Performance Schema host_cache table exposes the contents of the host cache so that it can be examined using SELECT statements. It does not use the cache for TCP connections established using a loopback interface address (for example, 127.0.0.1 ... The MySQL server maintains an in-memory host cache that contains information about clients: IP address, host name, and error ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-temporary-tablespace.html
Alternatively, check the global temporary tablespace data file size on your operating system. InnoDB uses session temporary tablespaces and a global temporary tablespace. Session Temporary Tablespaces Session temporary tablespaces store ...The ...