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https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html
Given this statement: CREATE TABLE t AS SELECT INET6_NTOA(expr) AS c1; The resulting table would have this definition: CREATE TABLE t (c1 VARCHAR(39) CHARACTER SET utf8mb3 DEFAULT NULL); The return string uses lowercase letters for IPv6 addresses.
https://dev.mysql.com/doc/refman/8.0/en/reloading-delimited-text-dumps.html
For backups produced with mysqldump --tab, each table is represented in the output directory by an .sql file containing the CREATE TABLE statement for the table, and a .txt file containing the table data. To reload a table, first change location ...
https://dev.mysql.com/doc/refman/8.0/en/subqueries.html
Beginning with MySQL 8.0.19, TABLE and VALUES statements can be used in subqueries. For information about how the optimizer handles subqueries, see Section 10.2.2, “Optimizing Subqueries, Derived Tables, View References, and Common Table ...All ...
https://dev.mysql.com/doc/refman/8.0/en/drop-index.html
algorithm_option: ALGORITHM [=] {DEFAULT | INPLACE | COPY} lock_option: LOCK [=] {DEFAULT | NONE | SHARED | EXCLUSIVE} DROP INDEX drops the index named index_name from the table tbl_name. This statement is mapped to an ALTER TABLE statement to drop ...This is done automatically by the server whenever it determines that it is possible to do so; you do not have to use any special SQL syntax or server options to cause it to ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool-resize.html
Before you change innodb_buffer_pool_chunk_size, calculate the effect on innodb_buffer_pool_size to ensure that the resulting buffer pool size is acceptable. Monitoring Online Buffer Pool Resizing Progress The Innodb_buffer_pool_resize_status ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-change-buffer.html
On disk, the change buffer is part of the system tablespace, where index changes are buffered when the database server is shut down. Configuring Change Buffering When INSERT, UPDATE, and DELETE operations are performed on a table, the values of ...
https://dev.mysql.com/doc/refman/8.0/en/nested-loop-joins.html
MySQL executes joins between tables using a nested-loop algorithm or variations on it. Nested-Loop Join Algorithm Block Nested-Loop Join Algorithm Nested-Loop Join Algorithm A simple nested-loop join (NLJ) algorithm reads rows from the first table ...For example, if 10 rows are read into a buffer and the buffer is passed to the next inner loop, each row read in the inner loop can be compared against all 10 rows in the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema.html
Event collection provides access to information about synchronization calls (such as for mutexes) file and table I/O, table locks, and so forth for the server and for several storage engines. Performance Schema tables are considered local to the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-rbr-safe-unsafe.html
Trigger or stored program updates a table having an AUTO_INCREMENT column. In addition, an INSERT into a table that has a composite primary key containing an AUTO_INCREMENT column that is not the first column of this composite key is unsafe. ON ...
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-elements.html
Prior to MySQL 8.0.14, the monitoring tables are INFORMATION_SCHEMA tables; see Section 28.5, “INFORMATION_SCHEMA Thread Pool Tables”. The INFORMATION_SCHEMA tables now are deprecated; expect them to be removed in a future version of MySQL. For ...