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https://dev.mysql.com/doc/refman/8.0/en/group-by-modifiers.html
To work around the restriction that prevents using ROLLUP with ORDER BY and achieve a specific sort order of grouped results, generate the grouped result set as a derived table and apply ORDER BY to it. The GROUP BY clause permits a WITH ROLLUP ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-dedicated-server.html
Warning Prior to MySQL 8.0.14, O_DIRECT_NO_FSYNC was not suitable for file systems such as XFS and EXT4, which require an fsync() system call to synchronize file system metadata changes. As of MySQL 8.0.14, fsync() is called after creating a new ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-benefits.html
You can create a new table for data, or use existing tables. The combination of InnoDB tables and memcached offers advantages over using either by themselves. Data written using the memcached protocol is transparently written to an InnoDB table, ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-recovery.html
In some cases of database corruption, it is enough to dump, drop, and re-create one or a few corrupt tables. You can use the CHECK TABLE statement to check whether a table is corrupt, although CHECK TABLE naturally cannot detect every possible kind ...To achieve point-in-time recovery after restoring a backup, you can apply changes from the binary log that occurred after the backup was ...
https://dev.mysql.com/doc/refman/8.0/en/mrr-optimization.html
Reading rows using a range scan on a secondary index can result in many random disk accesses to the base table when the table is large and not stored in the storage engine's cache. Then the keys are sorted and finally the rows are retrieved from ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-enterprise-backup.html
The product is architected for efficient and reliable backups of tables created by the InnoDB storage engine. For completeness, it can also back up tables from MyISAM and other storage engines. MySQL Enterprise Backup does a hot backup of all tables ... MySQL Enterprise Backup performs hot backup operations for MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-partitioning.html
Figure 19.2 Replicating Databases to Separate Replicas You can achieve this separation by configuring the source and replicas as normal, and then limiting the binary log statements that each replica processes by using the --replicate-wild-do-table ... There may be situations where you have a single source server and want to replicate different databases to different ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-components.html
A sink may also write to the Performance Schema error_log table; see Section 29.12.21.2, “The error_log Table”. For a sink component, whether it supports an interface to the Performance Schema error_log table. Provides a parser for reading error ... This section describes the characteristics of individual error log ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-boolean.html
InnoDB tables require a FULLTEXT index on all columns of the MATCH() expression to perform boolean queries. The minimum and maximum word length full-text parameters apply to FULLTEXT indexes created using the built-in FULLTEXT parser and MeCab ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-enterprise-backup.html
This is because the backup_progress table on the server is a CSV table, for which primary keys are not supported. Add a PK to the table or unset this variable to avoid this message. Note that tables without PK can cause performance problems in ...