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https://dev.mysql.com/doc/refman/8.0/en/index-page-merge-threshold.html
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 operation, InnoDB attempts to merge the index page with a neighboring index page. The default ...
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
The INNODB_TRX table provides information about every transaction currently executing inside InnoDB, including whether the transaction is waiting for a lock, when the transaction started, and the SQL statement the transaction is executing, if any.
https://dev.mysql.com/doc/refman/8.0/en/information-schema-introduction.html
INFORMATION_SCHEMA provides access to database metadata, information about the MySQL server such as the name of a database or table, the data type of a column, or access privileges. Other terms that are sometimes used for this information are data ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-statistics-table.html
The information_schema_stats_expiry system variable defines the period of time before cached table statistics expire. If there are no cached statistics or statistics have expired, statistics are retrieved from storage engines when querying table ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-user-attributes-table.html
The USER_ATTRIBUTES table (available as of MySQL 8.0.21) provides information about user comments and user attributes. The USER_ATTRIBUTES table has these columns: USER The user name portion of the account to which the ATTRIBUTE column value ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-autocommit-commit-rollback.html
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 with autocommit enabled, so MySQL does a commit after each SQL statement if that statement did not ...
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
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 memory, which speeds up processing. On dedicated servers, up to 80% of ...
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 ...