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https://dev.mysql.com/doc/refman/8.0/en/index-page-merge-threshold.html
If both pages are close to 50% full, a page split can occur soon after the pages are merged. If the “page-full” percentage for an index page falls below the MERGE_THRESHOLD value when a row is deleted or when a row is shortened by an UPDATE ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-buffer-pool-stats-table.html
The INNODB_BUFFER_POOL_STATS table provides much of the same buffer pool information provided in SHOW ENGINE INNODB STATUS output. Much of the same information may also be obtained using InnoDB buffer pool server status variables. The idea of ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-trx-table.html
When this column and TRX_IS_READ_ONLY are both 1, InnoDB optimizes the transaction to reduce the overhead associated with transactions that change table data. The INNODB_TRX table provides information about every transaction currently executing ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-introduction.html
Beginning with MySQL 8.0.30, information about generated invisible primary keys is visible by default in all INFORMATION_SCHEMA tables describing table columns, keys, or both, such as the COLUMNS and STATISTICS tables. INFORMATION_SCHEMA provides ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-statistics-table.html
EXPRESSION MySQL 8.0.13 and higher supports functional key parts (see Functional Key Parts), which affects both the COLUMN_NAME and EXPRESSION columns: For a nonfunctional key part, COLUMN_NAME indicates the column indexed by the key part and ...The ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-user-attributes-table.html
ATTRIBUTE The user comment, user attribute, or both belonging to the account specified by the USER and HOST columns. The USER_ATTRIBUTES table (available as of MySQL 8.0.21) provides information about user comments and user attributes. The ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-autocommit-commit-rollback.html
Both COMMIT and ROLLBACK release all InnoDB locks that were set during the current transaction. If autocommit mode is enabled, each SQL statement forms a single transaction on its own. By default, MySQL starts the session for each new connection ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool-resize.html
You can configure InnoDB buffer pool size offline or while the server is running. For additional information about configuring buffer pool size online, see Configuring InnoDB Buffer Pool Size Online. When increasing or decreasing ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool.html
Pages in both the new and old sublists age as other pages are made new. The buffer pool is an area in main memory where InnoDB caches table and index data as it is accessed. The buffer pool permits frequently used data to be accessed directly from ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-change-buffer.html
The change buffer is a special data structure that caches changes to secondary index pages when those pages are not in the buffer pool. The buffered changes, which may result from INSERT, UPDATE, or DELETE operations (DML), are merged later when ...