HeatWave Release Notes
For Auto Query Time Estimation to provide runtime data, a
query history must be available. Auto Query Time Estimation
can provide runtime data for up to 1000 queries, which is
the HeatWave query history limit. To view the current HeatWave
query history, query the
performance_schema.rpd_query_stats table:
mysql> SELECT query_id, LEFT(query_text,160)
FROM performance_schema.rpd_query_stats;
The following example shows how to retrieve runtime data for
the entire query history using Auto Query Time Estimation.
In this example, there are three queries in the query
history: a successfully executed query, a query that failed
due to an out of memory error, and a query that was
cancelled using Ctrl+C. For an
explanation of Auto Query Time Estimation data, see
Section 2.7.6.2, “Auto Query Time Estimation Data”.
mysql> CALL sys.heatwave_advisor(JSON_OBJECT('query_insights', true));
+-------------------------------+
| INITIALIZING HEATWAVE ADVISOR |
+-------------------------------+
| Version: 1.12 |
| |
| Output Mode: normal |
| Excluded Queries: 0 |
| Target Schemas: All |
| |
+-------------------------------+
6 rows in set (0.01 sec)
+---------------------------------------------------------+
| ANALYZING LOADED DATA |
+---------------------------------------------------------+
| Total 8 tables loaded in HeatWave for 1 schemas |
| Tables excluded by user: 0 (within target schemas) |
| |
| SCHEMA TABLES COLUMNS |
| NAME LOADED LOADED |
| ------ ------ ------ |
| `tpch128` 8 61 |
| |
+---------------------------------------------------------+
8 rows in set (0.02 sec)
+-------------------------------------------------------------------------------------+
| QUERY INSIGHTS |
+-------------------------------------------------------------------------------------+
| Queries executed on Heatwave: 4 |
| Session IDs (as filter): None |
| |
| QUERY-ID SESSION-ID QUERY-STRING EXEC-RUNTIME COMMENT |
| -------- ---------- ------------ ------------ ------- |
| 1 32 SELECT COUNT(*) |
| FROM tpch128.LINEITEM 0.628 |
| 2 32 SELECT COUNT(*) |
| FROM tpch128.ORDERS 0.114 (est.) Explain. |
| 3 32 SELECT COUNT(*) |
| FROM tpch128.ORDERS, |
| tpch128.LINEITEM 5.207 (est.) Out of memory |
| error during |
| query execution |
| in RAPID. |
| 4 32 SELECT COUNT(*) |
| FROM tpch128.SUPPLIER, |
| tpch128.LINEITEM 3.478 (est.) Operation was |
| interrupted by |
| the user. |
| TOTAL ESTIMATED: 3 EXEC-RUNTIME: 8.798 sec |
| TOTAL EXECUTED: 1 EXEC-RUNTIME: 0.628 sec |
| |
| |
| Retrieve detailed query statistics using the query below: |
| SELECT log FROM sys.heatwave_advisor_report WHERE stage = "QUERY_INSIGHTS" AND |
| type = "info"; |
| |
+-------------------------------------------------------------------------------------+
mysql> SELECT log FROM sys.heatwave_advisor_report
WHERE stage = "QUERY_INSIGHTS"
AND type = "info";
+--------------------------------------------------------------------------------------+
| log |
+--------------------------------------------------------------------------------------+
| {"comment": "", "query_id": 1, "query_text": "SELECT COUNT(*) FROM tpch128.LINEITEM",|
| "session_id": 32, "runtime_executed_ms": 627.6099681854248, |
| "runtime_estimated_ms": 454.398817} |
| |
| {"comment": "Explain.", "query_id": 2, "query_text": "SELECT COUNT(*) |
| FROM tpch128.ORDERS", "session_id": 32, "runtime_executed_ms": null, |
| "runtime_estimated_ms": 113.592768} |
| |
| {"comment": "Out of memory error during query execution in RAPID.", "query_id": 3, |
| "query_text": "SELECT COUNT(*) FROM tpch128.ORDERS, tpch128.LINEITEM", |
| "session_id": 32, "runtime_executed_ms": null, "runtime_estimated_ms": 5206.80822} |
| |
| {"comment": "Operation was interrupted by the user.", "query_id": 4, |
| "query_text": "SELECT COUNT(*) FROM tpch128.SUPPLIER, tpch128.LINEITEM", |
| "session_id": 32, "runtime_executed_ms": null, "runtime_estimated_ms": 3477.720953} |
+--------------------------------------------------------------------------------------+
4 rows in set (0.00 sec)