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https://dev.mysql.com/doc/refman/8.0/en/range-optimization.html
The range access method uses a single index to retrieve a subset of table rows that are contained within one or several index value intervals. To update table index statistics for best estimates, use ANALYZE TABLE. In MySQL 8.0, index dive skipping ...The following sections describe conditions under which the optimizer uses range ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-restrictions.html
In general, you cannot modify a table and select from the same table in a subquery. FROM t ...); Exception: The preceding prohibition does not apply if for the modified table you are using a derived table and that derived table is materialized ...
https://dev.mysql.com/doc/refman/8.0/en/type-conversion.html
mysql> SELECT 38.8, CAST(38.8 AS CHAR); -> 38.8, '38.8' mysql> SELECT 38.8, CONCAT(38.8); -> 38.8, '38.8' See later in this section for information about the character set of implicit number-to-string conversions, and for modified rules that apply ... When an operator is used with operands of different types, type conversion occurs to make the operands ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning.html
Section 26.3, “Partition Management”, covers methods of adding, removing, and altering partitions in existing partitioned tables. Note Table partitioning differs from partitioning as used by window functions. MySQL 8.0 does not currently support ...In MySQL 8.0, partitioning support is provided by the InnoDB and NDB storage ...
https://dev.mysql.com/doc/refman/8.0/en/view-algorithms.html
The optional ALGORITHM clause for CREATE VIEW or ALTER VIEW is a MySQL extension to standard SQL. For TEMPTABLE, the results from the view are retrieved into a temporary table, which then is used to execute the statement. It prefers MERGE over ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool-resize.html
Command line: $> mysqld --innodb-buffer-pool-chunk-size=134217728 Configuration file: [mysqld] innodb_buffer_pool_chunk_size=134217728 The following conditions apply when altering innodb_buffer_pool_chunk_size: If the new ... You can configure ...
https://dev.mysql.com/doc/refman/8.0/en/drop-tablespace.html
An NDB tablespace to be dropped must not contain any data files; in other words, before you can drop an NDB tablespace, you must first drop each of its data files using ALTER TABLESPACE ... mysql> CREATE TABLESPACE myts -> ADD DATAFILE ... DROP ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-undo-tablespaces.html
To empty an undo tablespace, the undo tablespace must first be marked as inactive using ALTER UNDO TABLESPACE syntax so that the tablespace is no longer used for assigning rollback segments to new transactions. ALTER UNDO TABLESPACE tablespace_name ... Undo tablespaces contain undo logs, which are collections of records containing information about how to undo the latest change by a transaction to a clustered index ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-cpustat.html
The cpustat table provides per-thread CPU statistics gathered each second, for each thread running in the NDB kernel.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-disk-write-speed-aggregate-node.html
The disk_write_speed_aggregate_node table provides aggregated information per node about the speed of disk writes during LCP, backup, and restore operations.