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https://dev.mysql.com/doc/refman/8.0/en/key-space.html
Space compression makes the index file smaller than the worst-case figure if a string column has a lot of trailing space or is a VARCHAR column that is not always used to the full length. You can roughly calculate the size for the index file as ...
https://dev.mysql.com/doc/refman/8.0/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
https://dev.mysql.com/doc/refman/8.0/en/memory-storage-engine.html
Variable-length types such as VARCHAR are stored using a fixed length. The MEMORY storage engine (formerly known as HEAP) creates special-purpose tables with contents that are stored in memory. Because the data is vulnerable to crashes, hardware ...
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/monitor-alter-table-performance-schema.html
mysql> ALTER TABLE employees.employees ADD COLUMN middle_name varchar(14) AFTER first_name; Query OK, 0 rows affected (9.27 sec) Records: 0 Duplicates: 0 Warnings: 0 Check the progress of the ALTER TABLE operation by querying the Performance Schema ... You can monitor ALTER TABLE progress for InnoDB tables using Performance ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-maintenance-schedule.html
If you are performing many updates to MyISAM tables with dynamic-sized rows (tables with VARCHAR, BLOB, or TEXT columns) or have tables with many deleted rows you may want to defragment/reclaim space from the tables from time to time. It is a good ...
https://dev.mysql.com/doc/refman/8.0/en/myisamchk-general-options.html
This is often the case when you have large key values for CHAR, VARCHAR, or TEXT columns, because the sort operation needs to store the complete key values as it proceeds. The options described in this section can be used for any type of table ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-limitations-syntax.html
However, you can create indexes on VARCHAR columns of NDB tables. Some SQL statements relating to certain MySQL features produce errors when used with NDB tables, as described in the following list: Temporary tables. Trying either to create a ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-limitations-unsupported.html
A number of features supported by other storage engines are not supported for NDB tables. Trying to use any of these features in NDB Cluster does not cause errors in or of itself; however, errors may occur in applications that expects the features ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndb-innodb-engines.html
The NDB storage engine is implemented using a distributed, shared-nothing architecture, which causes it to behave differently from InnoDB in a number of ways. For those unaccustomed to working with NDB, unexpected behaviors can arise due to its ...