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https://dev.mysql.com/doc/refman/8.0/en/uninstall-component.html
It requires the DELETE privilege for the mysql.component system table because it removes the row from that table that registers the component. A loader service handles component unloading, which includes removing uninstalled components from the ...A ...
https://dev.mysql.com/doc/refman/8.0/en/use.html
The named database remains the default until the end of the session or another USE statement is issued: USE db1; SELECT COUNT(*) FROM mytable; # selects from db1.mytable USE db2; SELECT COUNT(*) FROM mytable; # selects from db2.mytable The database ... USE db_name The USE statement tells MySQL to use the named database as the default (current) database for subsequent ...
https://dev.mysql.com/doc/refman/8.0/en/user-variables.html
(Exception: A user with access to the Performance Schema user_variables_by_thread table can see all user variables for all sessions.) All variables for a given client session are automatically freed when that client exits. (This is the same ... You ...
https://dev.mysql.com/doc/refman/8.0/en/what-is-mysql.html
A relational database stores data in separate tables rather than putting all the data in one big storeroom. The logical model, with objects such as databases, tables, views, rows, and columns, offers a flexible programming environment. You set up ...
https://dev.mysql.com/doc/refman/8.0/en/file-permissions.html
For example, mysqld might issue the following error message when you create a table: ERROR: Can't find file: 'path/with/file_name' (Errcode: 13) The default UMASK and UMASK_DIR values are 0640 and 0750, respectively. If this is unsuitable, create ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-frequently-asked-questions.html
This limit has been identified from testing and benchmarking as a safe boundary where the group performs reliably on a stable local area network. What is the group_replication_bootstrap_group option used for? The bootstrap flag instructs a member to ...What is the maximum number of MySQL servers in a group? A group can consist of maximum 9 ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-config-editor.html
The login path file must be readable and writable to the current user, and inaccessible to other users. Invoke mysql_config_editor like this: mysql_config_editor [program_options] command [command_options] If the login path file does not exist, ...
https://dev.mysql.com/doc/refman/8.0/en/charset-compatibility.html
For MaxDB compatibility these two statements are the same: CREATE TABLE t1 (f1 CHAR(N) UNICODE); CREATE TABLE t1 (f1 CHAR(N) CHARACTER SET ucs2); Both the UNICODE attribute and the ucs2 character set are deprecated in MySQL 8.0.28.
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-utf8mb3.html
For example: CREATE TABLE t (s1 CHAR(1)) CHARACTER SET utf8mb3; SELECT * FROM t WHERE s1 COLLATE utf8mb3_general_ci = 'x'; DECLARE x VARCHAR(5) CHARACTER SET utf8mb3 COLLATE utf8mb3_danish_ci; SELECT CAST('a' AS CHAR CHARACTER SET utf8mb4) COLLATE ... The utf8mb3 character set has these characteristics: Supports BMP characters only (no support for supplementary characters) Requires a maximum of three bytes per multibyte ...
https://dev.mysql.com/doc/refman/8.0/en/compilation-problems.html
Normally, the build process does not need to create sql_yacc.cc because MySQL comes with a pregenerated copy. However, if you do need to re-create it, you might encounter this error: "sql_yacc.yy", line xxx fatal: default action causes potential...