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https://dev.mysql.com/doc/refman/8.0/en/sys-ps-trace-statement-digest.html
Traces all Performance Schema instrumentation for a specific statement digest. If you find a statement of interest within the Performance Schema events_statements_summary_by_digest table, specify its DIGEST column MD5 value to this procedure and ...
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 ...