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MySQL 5.7 Reference Manual  /  ...  /  The ps_trace_statement_digest() Procedure

26.4.4.22 The ps_trace_statement_digest() Procedure

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 indicate the polling duration and interval. The result is a report of all statistics tracked within Performance Schema for that digest for the interval.

The procedure also attempts to execute EXPLAIN for the longest running example of the digest during the interval. This attempt might fail because the Performance Schema truncates long SQL_TEXT values. Consequently, EXPLAIN will fail due to parse errors.

This procedure requires the SUPER privilege because it manipulates the session sql_log_bin system variable to disable binary logging during its execution.

Parameters
  • in_digest VARCHAR(32): The statement digest identifier to analyze.

  • in_runtime INT: How long to run the analysis in seconds.

  • in_interval DECIMAL(2,2): The analysis interval in seconds (which can be fractional) at which to try to take snapshots.

  • in_start_fresh BOOLEAN: Whether to truncate the Performance Schema events_statements_history_long and events_stages_history_long tables before starting.

  • in_auto_enable BOOLEAN: Whether to automatically enable required consumers.

Example
mysql> CALL ps_trace_statement_digest('891ec6860f98ba46d89dd20b0c03652c', 10, 0.1, TRUE, TRUE);
+--------------------+
| SUMMARY STATISTICS |
+--------------------+
| SUMMARY STATISTICS |
+--------------------+
1 row in set (9.11 sec)

+------------+-----------+-----------+-----------+---------------+------------+------------+
| executions | exec_time | lock_time | rows_sent | rows_examined | tmp_tables | full_scans |
+------------+-----------+-----------+-----------+---------------+------------+------------+
|         21 | 4.11 ms   | 2.00 ms   |         0 |            21 |          0 |          0 |
+------------+-----------+-----------+-----------+---------------+------------+------------+
1 row in set (9.11 sec)

+------------------------------------------+-------+-----------+
| event_name                               | count | latency   |
+------------------------------------------+-------+-----------+
| stage/sql/checking query cache for query |    16 | 724.37 us |
| stage/sql/statistics                     |    16 | 546.92 us |
| stage/sql/freeing items                  |    18 | 520.11 us |
| stage/sql/init                           |    51 | 466.80 us |
...
| stage/sql/cleaning up                    |    18 | 11.92 us  |
| stage/sql/executing                      |    16 | 6.95 us   |
+------------------------------------------+-------+-----------+
17 rows in set (9.12 sec)

+---------------------------+
| LONGEST RUNNING STATEMENT |
+---------------------------+
| LONGEST RUNNING STATEMENT |
+---------------------------+
1 row in set (9.16 sec)

+-----------+-----------+-----------+-----------+---------------+------------+-----------+
| thread_id | exec_time | lock_time | rows_sent | rows_examined | tmp_tables | full_scan |
+-----------+-----------+-----------+-----------+---------------+------------+-----------+
|    166646 | 618.43 us | 1.00 ms   |         0 |             1 |          0 |         0 |
+-----------+-----------+-----------+-----------+---------------+------------+-----------+
1 row in set (9.16 sec)

# Truncated for clarity...
+-----------------------------------------------------------------+
| sql_text                                                        |
+-----------------------------------------------------------------+
| select hibeventhe0_.id as id1382_, hibeventhe0_.createdTime ... |
+-----------------------------------------------------------------+
1 row in set (9.17 sec)

+------------------------------------------+-----------+
| event_name                               | latency   |
+------------------------------------------+-----------+
| stage/sql/init                           | 8.61 us   |
| stage/sql/Waiting for query cache lock   | 453.23 us |
| stage/sql/init                           | 331.07 ns |
| stage/sql/checking query cache for query | 43.04 us  |
...
| stage/sql/freeing items                  | 30.46 us  |
| stage/sql/cleaning up                    | 662.13 ns |
+------------------------------------------+-----------+
18 rows in set (9.23 sec)

+----+-------------+--------------+-------+---------------+-----------+---------+-------------+------+-------+
| id | select_type | table        | type  | possible_keys | key       | key_len | ref         | rows | Extra |
+----+-------------+--------------+-------+---------------+-----------+---------+-------------+------+-------+
|  1 | SIMPLE      | hibeventhe0_ | const | fixedTime     | fixedTime | 775     | const,const |    1 | NULL  |
+----+-------------+--------------+-------+---------------+-----------+---------+-------------+------+-------+
1 row in set (9.27 sec)

Query OK, 0 rows affected (9.28 sec)

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