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https://dev.mysql.com/doc/refman/8.4/en/creating-spatial-columns.html
MySQL provides a standard way of creating spatial columns for geometry types, for example, with CREATE TABLE or ALTER TABLE. Spatial columns are supported for MyISAM, InnoDB, NDB, and ARCHIVE tables. Use the CREATE TABLE statement to create a table ...See also the notes about spatial indexes under Section 13.4.10, “Creating Spatial ...
https://dev.mysql.com/doc/refman/8.4/en/enum.html
An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time. Handling of Enumeration Literals Trailing spaces are automatically deleted from ENUM ...See Section 13.3.1, “String Data Type Syntax” for ENUM type syntax and length ...
https://dev.mysql.com/doc/refman/8.4/en/select-optimization.html
Besides SELECT statements, the tuning techniques for queries also apply to constructs such as CREATE TABLE...AS SELECT, INSERT INTO...SELECT, and WHERE clauses in DELETE statements. Indexes are especially important for queries that reference ...
https://dev.mysql.com/doc/refman/8.4/en/subqueries.html
For information about how the optimizer handles subqueries, see Section 10.2.2, “Optimizing Subqueries, Derived Tables, View References, and Common Table Expressions”. All subquery forms and operations that the SQL standard requires are ...
https://dev.mysql.com/doc/refman/8.4/en/subquery-materialization.html
Materialization speeds up query execution by generating a subquery result as a temporary table, normally in memory. The first time MySQL needs the subquery result, it materializes that result into a temporary table. Any subsequent time the result is ... The optimizer uses materialization to enable more efficient subquery ...
https://dev.mysql.com/doc/refman/8.4/en/subquery-optimization-with-exists.html
row *************************** id: 2 select_type: DEPENDENT SUBQUERY table: t2 type: ref_or_null possible_keys: maybe_null_key key: maybe_null_key key_len: 5 ref: func rows: 2 Extra: Using where; Using index ... Triggered equalities can be used by ... Certain optimizations are applicable to comparisons that use the IN (or =ANY) operator to test subquery ...
https://dev.mysql.com/doc/refman/8.4/en/webauthn-pluggable-authentication.html
Table 8.26 Plugin and Library Names for WebAuthn Authentication Plugin or File Plugin or File Name Server-side plugin authentication_webauthn Client-side plugin authentication_webauthn_client Library file authentication_webauthn.so, ... Note ...
https://dev.mysql.com/doc/relnotes/mysql-cluster/8.4/en/dynxml-auto-changelog-difflist-mysqld-8.4.1-ndb-8.4.1.html
It was removed due to a critical issue that could stop the server from restarting following the creation of a very large number of tables (8001 or more). ndbinfo Information Database: Added a type column to the transporter_details table in the ...
https://dev.mysql.com/doc/workbench/en/dbdoc-templates-custom.html
The copy can be given any suitable name; for example, Custom_Basic.tpl. This is done using a suitable command-line tool, and there are also free online tools that generate GUIDs. In the simplest case, a template consists of two files: a template ...
https://dev.mysql.com/doc/workbench/en/wb-migration-overview-steps.html
"Schema Name Mapping Method" options while migrating Microsoft SQL Server: Keep schemas as they are: Catalog.Schema.Table -> Schema.Table: This will create multiple databases, one per schema. Only one schema: Catalog.Schema.Table -> Catalog.Table: ... This example migrates a Microsoft SQL Server database to MySQL and includes an image for each ...