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https://dev.mysql.com/doc/refman/8.0/en/sys-schema-auto-increment-columns.html
This view indicates which tables have AUTO_INCREMENT columns and provides information about those columns, such as the current and maximum column values and the usage ratio (ratio of used to possible values). By default, rows are sorted by ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema.html
MySQL 8.0 includes the sys schema, a set of objects that helps DBAs and developers interpret data collected by the Performance Schema. sys schema objects can be used for typical tuning and diagnosis use cases. Objects in this schema include: Views ...For new installations, the sys schema is installed by default during data directory initialization if you use mysqld with the --initialize or --initialize-insecure ...
https://dev.mysql.com/doc/refman/8.0/en/uninstall-component.html
A component provides services that are available to the server and other components; see Section 7.5, “MySQL Components”. If any error occurs, the statement fails and has no effect. A loader service handles component unloading, which includes ...
https://dev.mysql.com/doc/refman/8.0/en/union.html
query_expression_body UNION [ALL | DISTINCT] query_block [UNION [ALL | DISTINCT] query_expression_body] [...] query_expression_body: See Section 15.2.14, “Set Operations with UNION, INTERSECT, and EXCEPT” UNION combines the result from multiple ...STRAIGHT_JOIN now permits a USING clause, similar to other inner ...
https://dev.mysql.com/doc/refman/8.0/en/verifying-md5-checksum.html
Each operating system and setup offers its own version of tools for checking the MD5 checksum. Typically the command is named md5sum, or it may be named md5, and some operating systems do not ship it at all. If you have OpenSSL installed, you can ...
https://dev.mysql.com/doc/refman/8.0/en/windows-start-command-line.html
The MySQL server can be started manually from the command line. To start the mysqld server from the command line, you should start a console window (or “DOS window”) and enter this command: C:\> "C:\Program Files\MySQL\MySQL Server ...Note ...
https://dev.mysql.com/doc/refman/8.0/en/windows-testing.html
In this case, start mysqld with the skip_name_resolve system variable enabled and use only localhost and IP addresses in the Host column of the MySQL grant tables. If you have set a password for the root account, deleted the anonymous account, or ...
https://dev.mysql.com/doc/refman/8.0/en/working-with-null.html
Conceptually, NULL means “a missing unknown value” and it is treated somewhat differently from other values. In MySQL, 0 or NULL means false and anything else means true. The NULL value can be surprising until you get used to it. This special ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-sha2-cache-plugin.html
You can use X Plugin to authenticate against such accounts using non-SSL connections with SHA256_MEMORY authentication and SSL connections with PLAIN authentication. The X Plugin authentication cache stores hashes of user account passwords, and ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-index-statistics.html
update_latency The total wait time of timed updates in the index. The schema_index_statistics and x$schema_index_statistics views have these columns: table_schema The schema that contains the table. select_latency The total wait time of timed reads ...