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https://dev.mysql.com/doc/refman/8.0/en/innodb-recovery.html
The innodb_directories default setting is NULL, but the directories defined by innodb_data_home_dir, innodb_undo_directory, and datadir are always appended to the innodb_directories argument value when InnoDB builds a list of directories to scan at ...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/innodb-temporary-tablespace.html
row *************************** FILE_NAME: ./ibtmp1 TABLESPACE_NAME: innodb_temporary ENGINE: InnoDB INITIAL_SIZE: 12582912 TotalSizeBytes: 12582912 DATA_FREE: 6291456 MAXIMUM_SIZE: NULL TotalSizeBytes shows the current size of the global temporary ... InnoDB uses session temporary tablespaces and a global temporary ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-transaction-scheduling.html
A transaction that is not waiting for a lock reports a NULL TRX_SCHEDULE_WEIGHT value. InnoDB uses the Contention-Aware Transaction Scheduling (CATS) algorithm to prioritize transactions that are waiting for locks. When multiple transactions are ...
https://dev.mysql.com/doc/refman/8.0/en/internal-temporary-tables.html
In some cases, the server creates internal temporary tables while processing statements. The server creates temporary tables under conditions such as these: Evaluation of UNION statements, with some exceptions described later. Evaluation of some ...
https://dev.mysql.com/doc/refman/8.0/en/kill.html
KILL [CONNECTION | QUERY] processlist_id Each connection to mysqld runs in a separate thread. Thread processlist identifiers can be determined from the ID column of the INFORMATION_SCHEMA PROCESSLIST table, the Id column of SHOW PROCESSLIST output, ...
https://dev.mysql.com/doc/refman/8.0/en/known-issues.html
SELECT statements that insert zero or NULL values into an AUTO_INCREMENT column. This section lists known issues in recent versions of MySQL. For information about platform-specific issues, see the installation and debugging instructions in Section ...
https://dev.mysql.com/doc/refman/8.0/en/literals.html
These include strings, numbers, hexadecimal and bit values, boolean values, and NULL. This section describes how to write literal values in MySQL. The section also covers various nuances that you may encounter when dealing with these basic types in ...
https://dev.mysql.com/doc/refman/8.0/en/log-file-maintenance.html
For example, execute these commands as root: mv /var/log/mysqld.log /var/log/mysqld.log.old install -omysql -gmysql -m0644 /dev/null /var/log/mysqld.log . As described in Section 7.4, “MySQL Server Logs”, MySQL Server can create several ...
https://dev.mysql.com/doc/refman/8.0/en/memory-storage-engine.html
(This is an uncommon feature for implementations of hash indexes.) Columns that are indexed can contain NULL values. The MEMORY storage engine (formerly known as HEAP) creates special-purpose tables with contents that are stored in memory. Because ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-storage-engine.html
MyISAM is based on the older (and no longer available) ISAM storage engine but has many useful extensions. Table 18.2 MyISAM Storage Engine Features Feature Support B-tree indexes Yes Backup/point-in-time recovery (Implemented in the server, rather ...