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https://dev.mysql.com/doc/refman/8.0/en/timestamp-initialization.html
TIMESTAMP and DATETIME columns can be automatically initialized and updated to the current date and time (that is, the current timestamp). In addition, if the explicit_defaults_for_timestamp system variable is disabled, you can initialize or update ...For any TIMESTAMP or DATETIME column in a table, you can assign the current timestamp as the default value, the auto-update value, or both: An auto-initialized column is set to the current timestamp for inserted rows that specify no value for the ...
https://dev.mysql.com/doc/refman/8.0/en/nested-join-optimization.html
The syntax of table_factor is extended in comparison with the SQL Standard. More exactly, we cannot ignore parentheses in the right operand of the left outer join operation and in the left operand of a right join operation. Parentheses for the other ...The following discussion refers to the join syntax described in Section 15.2.13.2, “JOIN ...
https://dev.mysql.com/doc/refman/8.0/en/mysqld-safe.html
mysqld_safe tries to use the sleep and date system utilities to determine how many times per second it has attempted to start. mysqld_safe adds some safety features such as restarting the server when an error occurs and logging runtime information ...Note For some Linux platforms, MySQL installation from RPM or Debian packages includes systemd support for managing MySQL server startup and ...
https://dev.mysql.com/doc/refman/8.0/en/binary-installation.html
These include generic binary distributions in the form of compressed tar files (files with a .tar.xz extension) for a number of platforms, and binaries in platform-specific package formats for selected platforms. MySQL compressed tar file binary ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-search-mecab.html
The built-in MySQL full-text parser uses the white space between words as a delimiter to determine where words begin and end, which is a limitation when working with ideographic languages that do not use word delimiters. The MeCab full-text parser ...To address this limitation for Japanese, MySQL provides a MeCab full-text parser ...
https://dev.mysql.com/doc/refman/8.0/en/import-table.html
Changing schema and table names may be required to accommodate differences between file system case-sensitivity semantics on the export and import servers or differences in lower_case_table_names settings. IMPORT TABLE requires the FILE privilege to ...The IMPORT TABLE statement imports MyISAM tables based on information contained in .sdi (serialized dictionary information) metadata ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-system-tables.html
Traditionally, you would get this type of information using the techniques from Section 17.17, “InnoDB Monitors”, setting up InnoDB monitors and parsing the output from the SHOW ENGINE INNODB STATUS statement. INNODB_DATAFILES provides data file ... You can extract metadata about schema objects managed by InnoDB using InnoDB INFORMATION_SCHEMA ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-locks-set.html
For locking reads (SELECT with FOR UPDATE or FOR SHARE), UPDATE, and DELETE statements, the locks that are taken depend on whether the statement uses a unique index with a unique search condition or a range-type search condition. The UPDATE ... A ...
https://dev.mysql.com/doc/refman/8.0/en/set-variable.html
Many system variables are dynamic and can be changed at runtime using the SET statement to affect operation of the current server instance. User-Defined Variable Assignment Parameter and Local Variable Assignment System Variable Assignment SET Error ...variable: { user_var_name | param_name | local_var_name | {GLOBAL | @@GLOBAL.} system_var_name | {PERSIST | @@PERSIST.} system_var_name | {PERSIST_ONLY | @@PERSIST_ONLY.} system_var_name | [SESSION | ...
https://dev.mysql.com/doc/refman/8.0/en/window-functions-frames.html
(For details about the permitted units specifiers, see the description of the DATE_ADD() function in Section 14.7, “Date and Time Functions”.) RANGE on a numeric or temporal expr requires ORDER BY on a numeric or temporal expression, ...A frame ... The definition of a window used with a window function can include a frame ...