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https://dev.mysql.com/doc/refman/9.7/en/innodb-change-buffer.html
Change buffer merging may take several hours when there are many affected rows and numerous secondary indexes to update. The change buffer is a special data structure that caches changes to secondary index pages when those pages are not in the ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-deadlock-detection.html
Disabling Deadlock Detection On high concurrency systems, deadlock detection can cause a slowdown when numerous threads wait for the same lock. When deadlock detection is enabled (the default), InnoDB automatically detects transaction deadlocks and ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-file-per-table-tablespaces.html
mysqld must keep an open file handle for each file-per-table tablespace, which may impact performance if you have numerous tables in file-per-table tablespaces. A file-per-table tablespace contains data and indexes for a single InnoDB table, and is ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-information-schema-system-tables.html
TYPE is a numerical value representing bit flags that provide additional information about the foreign key column. You can extract metadata about schema objects managed by InnoDB using InnoDB INFORMATION_SCHEMA tables. Traditionally, you would get ...
https://dev.mysql.com/doc/refman/9.7/en/install-component.html
Note While specifying a variable value using the SET clause is similar to that of the command line—it is available immediately at variable registration—there is a distinct difference in how the SET clause handles invalid numerical values for ...
https://dev.mysql.com/doc/refman/9.7/en/internal-locking.html
On high concurrency systems, deadlock detection can cause a slowdown when numerous threads wait for the same lock. This section discusses internal locking; that is, locking performed within the MySQL server itself to manage contention for table ...
https://dev.mysql.com/doc/refman/9.7/en/keyring-options.html
--keyring-migration-port=port_num Command-Line Format --keyring-migration-port=port_num Type Numeric Default Value 3306 For TCP/IP connections, the port number for connecting to the running server that is currently using one of the key migration ...
https://dev.mysql.com/doc/refman/9.7/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
https://dev.mysql.com/doc/refman/9.7/en/known-issues.html
Numeric calculations are done with BIGINT or DOUBLE (both are normally 64 bits long). This section lists known issues in recent versions of MySQL. For information about platform-specific issues, see the installation and debugging instructions in ...
https://dev.mysql.com/doc/refman/9.7/en/ldml-rules.html
This is a subset of the syntax described in the LDML specification available at http://www.unicode.org/reports/tr35/, which should be consulted for further information. MySQL recognizes a large enough subset of the syntax that, in many cases, it is ...