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Update tune-performance-with-the-query-store.md #9801

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49 changes: 37 additions & 12 deletions docs/relational-databases/performance/tune-performance-with-the-query-store.md
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Original file line number Diff line number Diff line change
Expand Up @@ -68,18 +68,25 @@ ORDER BY total_execution_count DESC;
The number of queries with the longest average execution time within last hour:

```sql
SELECT TOP 10 rs.avg_duration, qt.query_sql_text, q.query_id,
qt.query_text_id, p.plan_id, GETUTCDATE() AS CurrentUTCTime,
rs.last_execution_time
SELECT TOP 10
AVG(rs.avg_duration) AS avg_duration,
SUM(rs.count_executions) AS total_execution_count,
qt.query_sql_text,
q.query_id,
qt.query_text_id,
p.plan_id,
GETUTCDATE() AS CurrentUTCTime,
MAX(rs.last_execution_time) AS last_execution_time
FROM sys.query_store_query_text AS qt
JOIN sys.query_store_query AS q
ON qt.query_text_id = q.query_text_id
JOIN sys.query_store_plan AS p
ON q.query_id = p.query_id
JOIN sys.query_store_runtime_stats AS rs
ON p.plan_id = rs.plan_id
WHERE rs.last_execution_time > DATEADD(hour, -1, GETUTCDATE())
ORDER BY rs.avg_duration DESC;
JOIN sys.query_store_query AS q ON
qt.query_text_id = q.query_text_id
JOIN sys.query_store_plan AS p ON
q.query_id = p.query_id
JOIN sys.query_store_runtime_stats AS rs ON
p.plan_id = rs.plan_id
WHERE rs.last_execution_time > DATEADD(HOUR, -1, GETUTCDATE())
GROUP BY qt.query_sql_text, q.query_id, qt.query_text_id, p.plan_id
ORDER BY AVG(rs.avg_duration) DESC;
```

#### Biggest average physical I/O reads
Expand All @@ -105,7 +112,25 @@ ORDER BY rs.avg_physical_io_reads DESC;

#### Queries with multiple plans

These queries are especially interesting because they're candidates for regressions due to plan choice change. The following query identifies these queries along with all plans:
These queries are especially interesting because they're candidates for regressions due to plan choice change.

The following query identifies queries with the highest number of plans:

```sql
SELECT COUNT(*) AS cnt, q.query_id, object_name(object_id) AS ContainingObject,
MAX(p.last_compile_start_time) last_compile_start_time,
MAX(p.last_execution_time) last_execution_time, STRING_AGG( plan_id,',') plan_ids
FROM sys.query_store_query_text AS qt
JOIN sys.query_store_query AS q
ON qt.query_text_id = q.query_text_id
JOIN sys.query_store_plan AS p
ON p.query_id = q.query_id
GROUP BY OBJECT_NAME(object_id), q.query_id
HAVING COUNT(distinct plan_id) > 1
ORDER BY cnt desc
```

The following query identifies these queries along with all plans:

```sql
WITH Query_MultPlans
Expand Down