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https://dev.mysql.com/doc/refman/8.0/en/string-functions-charset.html
In such expressions, the table character set is used for BIN_TO_UUID(), CONV(), or HEX() results, regardless of connection character set. MySQL has many operators and functions that return a string. This section answers the question: What is the ...
https://dev.mysql.com/doc/refman/8.0/en/string-functions.html
For functions that operate on string positions, the first position is numbered 1. For functions that take length arguments, noninteger arguments are rounded to the nearest integer. ASCII(str) Returns the numeric value of the leftmost character of ...
https://dev.mysql.com/doc/refman/8.0/en/sys-execute-prepared-stmt.html
Configuration Options execute_prepared_stmt() operation can be modified using the following configuration options or their corresponding user-defined variables (see Section 30.4.2.1, “The sys_config Table”): debug, @sys.debug If this option is ... Given an SQL statement as a string, executes it as a prepared ...
https://dev.mysql.com/doc/refman/8.0/en/sys-host-summary-by-file-io-type.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. These views summarize file I/O, grouped by host and event type. By default, ...
https://dev.mysql.com/doc/refman/8.0/en/sys-host-summary-by-file-io.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. By default, rows are sorted by descending total file I/O latency. The ...
https://dev.mysql.com/doc/refman/8.0/en/sys-host-summary-by-stages.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. By default, rows are sorted by host and descending total latency. The ...
https://dev.mysql.com/doc/refman/8.0/en/sys-memory-by-host-by-current-bytes.html
Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. By default, rows are sorted by descending amount of memory used. The ...
https://dev.mysql.com/doc/refman/8.0/en/sys-memory-by-user-by-current-bytes.html
Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. By default, rows are sorted by descending amount of memory used. The ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-is-thread-instrumented.html
This is a value of the type given in the PROCESSLIST_ID column of the Performance Schema threads table or the Id column of SHOW PROCESSLIST output. Returns YES or NO to indicate whether Performance Schema instrumentation for a given connection ID ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-setup-disable-thread.html
This is a value of the type given in the PROCESSLIST_ID column of the Performance Schema threads table or the Id column of SHOW PROCESSLIST output. Given a connection ID, disables Performance Schema instrumentation for the thread. Example Disable a ...