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https://dev.mysql.com/doc/refman/8.0/en/mysqldump-delimited-text.html
If you invoke mysqldump with the --tab=dir_name option, it uses dir_name as the output directory and dumps tables individually in that directory using two files for each table. For a table named t1, the files are named t1.sql and t1.txt. The .sql ...
https://dev.mysql.com/doc/refman/8.0/en/outer-join-optimization.html
MySQL implements an A LEFT JOIN B join_specification as follows: Table B is set to depend on table A and all tables on which A depends. Table A is set to depend on all tables (except B) that are used in the LEFT JOIN condition. The LEFT JOIN ...If ...
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/user-resources.html
Only statements that modify databases or tables count against the update limit. An “account” in this context corresponds to a row in the mysql.user system table. That is, a connection is assessed against the User and Host values in the user ...
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 ...