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https://dev.mysql.com/doc/refman/8.0/en/slow-query-log.html
To specify the log destination, use the log_output system variable (as described in Section 7.4.1, “Selecting General Query Log and Slow Query Log Output Destinations”). Note If you specify the TABLE log destination, see Log Tables and “Too ...
https://dev.mysql.com/doc/refman/8.0/en/sorting-rows.html
You may have noticed in the preceding examples that the result rows are displayed in no particular order. It is often easier to examine query output when the rows are sorted in some meaningful way. This means that the order is undefined for columns ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-geojson-functions.html
This section describes functions for converting between GeoJSON documents and spatial values. Feature and FeatureCollection objects are not supported, except that geometry objects are extracted from them. MySQL also supports a native JSON data type ...
https://dev.mysql.com/doc/refman/8.0/en/statement-labels.html
[begin_label:] BEGIN [statement_list] END [end_label] [begin_label:] LOOP statement_list END LOOP [end_label] [begin_label:] REPEAT statement_list UNTIL search_condition END REPEAT [end_label] [begin_label:] WHILE search_condition DO statement_list ...
https://dev.mysql.com/doc/refman/8.0/en/stored-programs-logging.html
The binary log contains information about SQL statements that modify database contents. This information is stored in the form of “events” that describe the modifications. (Binary log events differ from scheduled event stored objects.) The ...
https://dev.mysql.com/doc/refman/8.0/en/sys-execute-prepared-stmt.html
Given an SQL statement as a string, executes it as a prepared statement. The prepared statement is deallocated after execution, so it is not subject to reuse. Thus, this procedure is useful primarily for executing dynamic statements on a one-time ...
https://dev.mysql.com/doc/refman/8.0/en/sys-format-path.html
Given a path name, returns the modified path name after replacing subpaths that match the values of the following system variables, in order: datadir tmpdir slave_load_tmpdir or replica_load_tmpdir innodb_data_home_dir innodb_log_group_home_dir ...
https://dev.mysql.com/doc/refman/8.0/en/sys-format-statement.html
Given a string (normally representing an SQL statement), reduces it to the length given by the statement_truncate_len configuration option, and returns the result. Otherwise, the middle part of the string is replaced by an ellipsis (...). This ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-statement-avg-latency-histogram.html
Displays a textual histogram graph of the average latency values across all normalized statements tracked within the Performance Schema events_statements_summary_by_digest table. This procedure can be used to display a very high-level picture of ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-thread-stack.html
Returns a JSON formatted stack of all statements, stages, and events within the Performance Schema for a given thread ID. The value should match the THREAD_ID column from some Performance Schema threads table row. row *************************** ...
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