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https://dev.mysql.com/doc/refman/8.0/en/extended-show.html
Some extensions to SHOW statements accompany the implementation of INFORMATION_SCHEMA: SHOW can be used to get information about the structure of INFORMATION_SCHEMA itself. Several SHOW statements accept a WHERE clause that provides more ...
https://dev.mysql.com/doc/refman/8.0/en/federated-storage-engine.html
The FEDERATED storage engine lets you access data from a remote MySQL database without using replication or cluster technology. To include the FEDERATED storage engine if you build MySQL from source, invoke CMake with the ...Querying a local ...
https://dev.mysql.com/doc/refman/8.0/en/general-security-issues.html
This section describes general security issues to be aware of and what you can do to make your MySQL installation more secure against attack or misuse. For information specifically about the access control system that MySQL uses for setting up user ...
https://dev.mysql.com/doc/refman/8.0/en/getting-information.html
What if you forget the name of a database or table, or what the structure of a given table is (for example, what its columns are called)? MySQL addresses this problem through several statements that provide information about the databases and ...
https://dev.mysql.com/doc/refman/8.0/en/gis-geometrycollection-property-functions.html
mysql> SET @gc = 'GeometryCollection(Point(1 1),LineString(2 2, 3 3))'; mysql> SELECT ST_AsText(ST_GeometryN(ST_GeomFromText(@gc),1)); +-------------------------------------------------+ | ST_AsText(ST_GeometryN(ST_GeomFromText(@gc),1)) | ...Unless ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-compatibility-upgrade.html
The primary cannot remain as the primary unless it is running the lowest MySQL Server version in the group. From MySQL 8.0.17, this applies to upgrades between patch versions, and for lower releases, this only applies to upgrades between major ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-deploying-in-single-primary-mode.html
Each of the MySQL server instances in a group can run on an independent physical host machine, which is the recommended way to deploy Group Replication. This section explains how to create a replication group with three MySQL Server instances, each ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-online-upgrade-considerations.html
When MySQL 5.7.22 or MySQL 8.0.11 tries to join a group running MySQL 5.7.21 or lower it fails to join the group because MySQL 5.7.21 does not send its value of lower_case_table_names. When upgrading an online group you should consider the ...
https://dev.mysql.com/doc/refman/8.0/en/index-page-merge-threshold.html
For example: mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_INDEXES WHERE NAME='id_index' \G *************************** 1. row *************************** INDEX_ID: 91 NAME: id_index TABLE_ID: 68 TYPE: 0 N_FIELDS: 1 PAGE_NO: 4 SPACE: 57 ...If the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-keywords-table.html
This table provides applications a runtime source of MySQL keyword information. The KEYWORDS table lists the words considered keywords by MySQL and, for each one, indicates whether it is reserved. Prior to MySQL 8.0.13, selecting from the KEYWORDS ...Reserved keywords may require special treatment in some contexts, such as special quoting when used as identifiers (see Section 11.3, “Keywords and Reserved ...