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https://dev.mysql.com/doc/refman/8.4/en/insert-delayed.html
The DELAYED option for the INSERT statement is a MySQL extension to standard SQL. The server recognizes but ignores the DELAYED keyword, handles the insert as a nondelayed insert, and generates an ER_WARN_LEGACY_SYNTAX_CONVERTED warning: INSERT ...
https://dev.mysql.com/doc/refman/8.4/en/integer-types.html
The following table shows the required storage and range for each integer type. MySQL supports the SQL standard integer types INTEGER (or INT) and SMALLINT. As an extension to the standard, MySQL also supports the integer types TINYINT, MEDIUMINT, ...
https://dev.mysql.com/doc/refman/8.4/en/is-null-optimization.html
This optimization does not occur in cases when the column might produce NULL anyway (for example, if it comes from a table on the right side of a LEFT JOIN). MySQL can perform the same optimization on col_name IS NULL that it can use for col_name = ...
https://dev.mysql.com/doc/refman/8.4/en/json-function-reference.html
Table 14.22 JSON Functions Name Description Deprecated -> Return value from JSON column after evaluating path; equivalent to JSON_EXTRACT(). ->> Return value from JSON column after evaluating path and unquoting the result; equivalent to ...
https://dev.mysql.com/doc/refman/8.4/en/json-modification-functions.html
MySQL recognizes the escape sequences shown in Table 14.23, “JSON_UNQUOTE() Special Character Escape Sequences”. The functions in this section modify JSON values and return the result. JSON_ARRAY_APPEND(json_doc, path, val[, path, val] ...) ...
https://dev.mysql.com/doc/refman/8.4/en/ldml-collation-example.html
To add a UCA collation for a Unicode character set without recompiling MySQL, use the following procedure. If you are unfamiliar with the LDML rules used to describe the collation's sort characteristics, see Section 12.14.4.2, “LDML Syntax ...
https://dev.mysql.com/doc/refman/8.4/en/linux-installation-debian.html
Oracle provides Debian packages for installing MySQL on Debian or Debian-like Linux systems. The packages are available through two different channels: The MySQL APT Repository. This is the preferred method for installing MySQL on Debian-like ...
https://dev.mysql.com/doc/refman/8.4/en/myisamlog.html
If tables are named on the command line, only those tables are updated. To create such a file, start the server with a --log-isam=log_file option. Invoke myisamlog like this: myisamlog [options] [file_name [tbl_name] ...] The default operation is ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-acid.html
Details can be viewed in the INFORMATION_SCHEMA tables (see Section 17.15.2, “InnoDB INFORMATION_SCHEMA Transaction and Locking Information”) and Performance Schema data_locks and data_lock_waits tables. The ACID model is a set of database ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-basics.html
NDB Cluster tables are normally stored completely in memory rather than on disk (this is why we refer to NDB Cluster as an in-memory database). However, some NDB Cluster data can be stored on disk; see Section 25.6.11, “NDB Cluster Disk Data ...