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https://dev.mysql.com/doc/refman/8.0/en/sys-schema-object-index.html
The following tables list sys schema objects and provide a short description of each one.
https://dev.mysql.com/doc/refman/8.0/en/sys-schema.html
The MySQL upgrade procedure produces an error if a sys schema exists but has no version view, on the assumption that absence of this view indicates a user-created sys schema. MySQL 8.0 includes the sys schema, a set of objects that helps DBAs and ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statement-analysis.html
err_count The total number of errors produced by occurrences of the statement. The statement_analysis and x$statement_analysis views have these columns: query The normalized statement string. db The default database for the statement, or NULL if ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statements-with-runtimes-in-95th-percentile.html
err_count The total number of errors produced by occurrences of the statement. These views list statements with runtimes in the 95th percentile. The statements_with_runtimes_in_95th_percentile and x$statements_with_runtimes_in_95th_percentile views ...
https://dev.mysql.com/doc/refman/8.0/en/table-cache.html
When you execute a mysqladmin status command, you should see something like this: Uptime: 426 Running threads: 1 Questions: 11082 Reloads: 1 Open tables: 12 The Open tables value of 12 can be somewhat puzzling if you have fewer than 12 tables.
https://dev.mysql.com/doc/refman/8.0/en/table-size-limit.html
If you encounter a full-table error, there are several reasons why it might have occurred: The disk might be full. The effective maximum table size for MySQL databases is usually determined by operating system constraints on file sizes, not by ...
https://dev.mysql.com/doc/refman/8.0/en/thread-commands.html
A thread can have any of the following Command values: Binlog Dump This is a thread on a replication source for sending binary log contents to a replica. Connect Used by replication receiver threads connected to the source, and by replication ...
https://dev.mysql.com/doc/refman/8.0/en/time.html
For more restrictive treatment of invalid TIME values, enable strict SQL mode to cause errors to occur. MySQL retrieves and displays TIME values in 'hh:mm:ss' format (or 'hhh:mm:ss' format for large hours values). The hours part may be so large ...
https://dev.mysql.com/doc/refman/8.0/en/timestamp-initialization.html
Note The following examples use DEFAULT 0, a default that can produce warnings or errors depending on whether strict SQL mode or the NO_ZERO_DATE SQL mode is enabled. TIMESTAMP and DATETIME columns can be automatically initialized and updated to ...
https://dev.mysql.com/doc/refman/8.0/en/too-many-connections.html
If clients encounter Too many connections errors when attempting to connect to the mysqld server, all available connections are in use by other clients. The permitted number of connections is controlled by the max_connections system variable. The ...