sys.dm_exec_query_stats (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns aggregate performance statistics for cached query plans in SQL Server. The view contains one row per query statement within the cached plan, and the lifetime of the rows are tied to the plan itself. When a plan is removed from the cache, the corresponding rows are eliminated from this view.
The results of sys.dm_exec_query_stats can vary with each execution as the data only reflects finished queries, and not ones still in-flight.
To call this DMV from a dedicated SQL pool in Azure Synapse Analytics or Analytics Platform System (PDW), use the name sys.dm_pdw_nodes_exec_query_stats. For serverless SQL pool, use sys.dm_exec_query_stats.
| Column name | Data type | Description |
|---|---|---|
sql_handle |
varbinary(64) | A token that uniquely identifies the batch or stored procedure that the query is part of.sql_handle, together with statement_start_offset and statement_end_offset, can be used to retrieve the SQL text of the query by calling the sys.dm_exec_sql_text dynamic management function. |
statement_start_offset |
int | Indicates, in bytes, beginning with 0, the starting position of the query that the row describes within the text of its batch or persisted object. |
statement_end_offset |
int | Indicates, in bytes, starting with 0, the ending position of the query that the row describes within the text of its batch or persisted object. For versions before SQL Server 2014 (12.x), a value of -1 indicates the end of the batch. Trailing comments are no longer included. |
plan_generation_num |
bigint | A sequence number that can be used to distinguish between instances of plans after a recompile. |
plan_handle |
varbinary(64) | A token that uniquely identifies a query execution plan for a batch that has executed and its plan resides in the plan cache, or is currently executing. This value can be passed to the sys.dm_exec_query_plan dynamic management function to obtain the query plan. Always 0x000 when a natively compiled stored procedure queries a memory-optimized table. |
creation_time |
datetime | Time at which the plan was compiled. The time is recorded in the current timezone. |
last_execution_time |
datetime | Last time at which the plan started executing. The time is recorded in the current timezone. |
execution_count |
bigint | Number of times that the plan has been executed since it was last compiled. |
total_worker_time |
bigint | Total amount of CPU time, reported in microseconds (but only accurate to milliseconds), that was consumed by executions of this plan since it was compiled. For natively compiled stored procedures, total_worker_time might not be accurate if many executions take less than 1 millisecond. |
last_worker_time |
bigint | CPU time, reported in microseconds (but only accurate to milliseconds), that was consumed the last time the plan was executed. 1 |
min_worker_time |
bigint | Minimum CPU time, reported in microseconds (but only accurate to milliseconds), that this plan has ever consumed during a single execution. 1 |
max_worker_time |
bigint | Maximum CPU time, reported in microseconds (but only accurate to milliseconds), that this plan has ever consumed during a single execution. 1 |
total_physical_reads |
bigint | Total number of physical reads performed by executions of this plan since it was compiled. Always 0 when querying a memory-optimized table. |
last_physical_reads |
bigint | Number of physical reads performed the last time the plan was executed. Always 0 when querying a memory-optimized table. |
min_physical_reads |
bigint | Minimum number of physical reads that this plan has ever performed during a single execution. Always 0 when querying a memory-optimized table. |
max_physical_reads |
bigint | Maximum number of physical reads that this plan has ever performed during a single execution. Always 0 when querying a memory-optimized table. |
total_logical_writes |
bigint | Total number of logical writes performed by executions of this plan since it was compiled. Always 0 when querying a memory-optimized table. |
last_logical_writes |
bigint | Number of buffer pool pages dirtied during the most recently completed execution of the plan. After a page is read, the page becomes dirty only the first time it's modified. When a page becomes dirty, this number is incremented. Subsequent modifications of an already dirty page don't affect this number. This number Always 0 when querying a memory-optimized table. |
min_logical_writes |
bigint | Minimum number of logical writes that this plan has ever performed during a single execution. Always 0 when querying a memory-optimized table. |
max_logical_writes |
bigint | Maximum number of logical writes that this plan has ever performed during a single execution. Always 0 when querying a memory-optimized table. |
total_logical_reads |
bigint | Total number of logical reads performed by executions of this plan since it was compiled. Always 0 when querying a memory-optimized table. |
last_logical_reads |
bigint | Number of logical reads performed the last time the plan was executed. Always 0 when querying a memory-optimized table. |
min_logical_reads |
bigint | Minimum number of logical reads that this plan has ever performed during a single execution. Always 0 when querying a memory-optimized table. |
max_logical_reads |
bigint | Maximum number of logical reads that this plan has ever performed during a single execution. Always 0 when querying a memory-optimized table. |
total_clr_time |
bigint | Time, reported in microseconds (but only accurate to milliseconds), consumed inside Microsoft .NET Framework common language runtime (CLR) objects by executions of this plan since it was compiled. The CLR objects can be stored procedures, functions, triggers, types, and aggregates. |
last_clr_time |
bigint | Time, reported in microseconds (but only accurate to milliseconds) consumed by execution inside .NET Framework CLR objects during the last execution of this plan. The CLR objects can be stored procedures, functions, triggers, types, and aggregates. |
min_clr_time |
bigint | Minimum time, reported in microseconds (but only accurate to milliseconds), that this plan has ever consumed inside .NET Framework CLR objects during a single execution. The CLR objects can be stored procedures, functions, triggers, types, and aggregates. |
max_clr_time |
bigint | Maximum time, reported in microseconds (but only accurate to milliseconds), that this plan has ever consumed inside the .NET Framework CLR during a single execution. The CLR objects can be stored procedures, functions, triggers, types, and aggregates. |
total_elapsed_time |
bigint | Total elapsed time, reported in microseconds (but only accurate to milliseconds), for completed executions of this plan. |
last_elapsed_time |
bigint | Elapsed time, reported in microseconds (but only accurate to milliseconds), for the most recently completed execution of this plan. |
min_elapsed_time |
bigint | Minimum elapsed time, reported in microseconds (but only accurate to milliseconds), for any completed execution of this plan. |
max_elapsed_time |
bigint | Maximum elapsed time, reported in microseconds (but only accurate to milliseconds), for any completed execution of this plan. |
query_hash |
Binary(8) | Binary hash value calculated on the query and used to identify queries with similar logic. You can use the query hash to determine the aggregate resource usage for queries that differ only by literal values. |
query_plan_hash |
binary(8) | Binary hash value calculated on the query execution plan and used to identify similar query execution plans. You can use query plan hash to find the cumulative cost of queries with similar execution plans. Always 0x000 when a natively compiled stored procedure queries a memory-optimized table. |
total_rows |
bigint | Total number of rows returned by the query. Can't be null. Always 0 when a natively compiled stored procedure queries a memory-optimized table. |
last_rows |
bigint | Number of rows returned by the last execution of the query. Can't be null. Always 0 when a natively compiled stored procedure queries a memory-optimized table. |
min_rows |
bigint | Minimum number of rows ever returned by the query during one execution. Can't be null. Always 0 when a natively compiled stored procedure queries a memory-optimized table. |
max_rows |
bigint | Maximum number of rows ever returned by the query during one execution. Can't be null. Always 0 when a natively compiled stored procedure queries a memory-optimized table. |
statement_sql_handle |
varbinary(64) | Applies to: SQL Server 2014 (12.x) and later versions. Populated with non-NULL values only if Query Store is turned on and collecting the stats for that particular query. |
statement_context_id |
bigint | Applies to: SQL Server 2014 (12.x) and later versions. Populated with non-NULL values only if Query Store is turned on and collecting the stats for that particular query. |
total_dop |
bigint | The total sum of degree of parallelism this plan used since it was compiled. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
last_dop |
bigint | The degree of parallelism when this plan executed last time. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
min_dop |
bigint | The minimum degree of parallelism this plan ever used during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
max_dop |
bigint | The maximum degree of parallelism this plan ever used during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
total_grant_kb |
bigint | The total amount of reserved memory grant in KB this plan received since it was compiled. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
last_grant_kb |
bigint | The amount of reserved memory grant in KB when this plan executed last time. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
min_grant_kb |
bigint | The minimum amount of reserved memory grant in KB this plan ever received during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
max_grant_kb |
bigint | The maximum amount of reserved memory grant in KB this plan ever received during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
total_used_grant_kb |
bigint | The total amount of reserved memory grant in KB this plan used since it was compiled. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
last_used_grant_kb |
bigint | The amount of used memory grant in KB when this plan executed last time. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
min_used_grant_kb |
bigint | The minimum amount of used memory grant in KB this plan ever used during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
max_used_grant_kb |
bigint | The maximum amount of used memory grant in KB this plan ever used during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
total_ideal_grant_kb |
bigint | The total amount of ideal memory grant in KB this plan estimated since it was compiled. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
last_ideal_grant_kb |
bigint | The amount of ideal memory grant in KB when this plan executed last time. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
min_ideal_grant_kb |
bigint | The minimum amount of ideal memory grant in KB this plan ever estimated during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
max_ideal_grant_kb |
bigint | The maximum amount of ideal memory grant in KB this plan ever estimated during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
total_reserved_threads |
bigint | The total sum of reserved parallel threads this plan ever used since it was compiled. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
last_reserved_threads |
bigint | The number of reserved parallel threads when this plan executed last time. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
min_reserved_threads |
bigint | The minimum number of reserved parallel threads this plan ever used during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
max_reserved_threads |
bigint | The maximum number of reserved parallel threads this plan ever used during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
total_used_threads |
bigint | The total sum of used parallel threads this plan ever used since it was compiled. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
last_used_threads |
bigint | The number of used parallel threads when this plan executed last time. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
min_used_threads |
bigint | The minimum number of used parallel threads this plan ever used during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
max_used_threads |
bigint | The maximum number of used parallel threads this plan ever used during one execution. Always 0 for querying a memory-optimized table.Applies to: SQL Server 2016 (13.x) and later versions. |
total_columnstore_segment_reads |
bigint | The total sum of columnstore segments read by the query. Can't be null. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
last_columnstore_segment_reads |
bigint | The number of columnstore segments read by the last execution of the query. Can't be null. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
min_columnstore_segment_reads |
bigint | The minimum number of columnstore segments ever read by the query during one execution. Can't be null. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
max_columnstore_segment_reads |
bigint | The maximum number of columnstore segments ever read by the query during one execution. Can't be null. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
total_columnstore_segment_skips |
bigint | The total sum of columnstore segments skipped by the query. Can't be null. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
last_columnstore_segment_skips |
bigint | The number of columnstore segments skipped by the last execution of the query. Can't be null. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
min_columnstore_segment_skips |
bigint | The minimum number of columnstore segments ever skipped by the query during one execution. Can't be null. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
max_columnstore_segment_skips |
bigint | The maximum number of columnstore segments ever skipped by the query during one execution. Can't be null. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
total_spills |
bigint | The total number of pages spilled by execution of this query since it was compiled. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
last_spills |
bigint | The number of pages spilled the last time the query was executed. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
min_spills |
bigint | The minimum number of pages that this query has ever spilled during a single execution. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
max_spills |
bigint | The maximum number of pages that this query has ever spilled during a single execution. Applies to: Starting with SQL Server 2016 (13.x) SP2 and SQL Server 2017 (14.x) CU3 |
pdw_node_id |
int | The identifier for the node that this distribution is on. Applies to: Azure Synapse Analytics, Analytics Platform System (PDW) |
total_page_server_reads |
bigint | Total number of remote page server reads performed by executions of this plan since it was compiled. Applies to: Azure SQL Database Hyperscale |
last_page_server_reads |
bigint | Number of remote page server reads performed the last time the plan was executed. Applies To: Azure SQL Database Hyperscale |
min_page_server_reads |
bigint | Minimum number of remote page server reads that this plan has ever performed during a single execution. Applies To: Azure SQL Database Hyperscale |
max_page_server_reads |
bigint | Maximum number of remote page server reads that this plan has ever performed during a single execution. Applies To: Azure SQL Database Hyperscale |
Note
1 For natively compiled stored procedures when statistics collection is enabled, worker time is collected in milliseconds. If the query executes in less than one millisecond, the value is 0.
Permissions
SQL Server 2019 (15.x) and earlier versions, and Azure SQL Managed Instance, require VIEW SERVER STATE permission.
SQL Server 2022 (16.x) and later versions require VIEW SERVER PERFORMANCE STATE permission on the server.
On Azure SQL Database Basic, S0, and S1 service objectives, and for databases in elastic pools, the server admin account, the Microsoft Entra admin account, or membership in the ##MS_ServerStateReader## server role is required. On all other SQL Database service objectives, either the VIEW DATABASE STATE permission on the database, or membership in the ##MS_ServerStateReader## server role is required.
Remarks
Statistics in the view are updated when a query is completed.
Examples
A. Find the TOP N queries
The following example returns information about the top five queries ranked by average CPU time. This example aggregates the queries according to their query hash so that logically equivalent queries are grouped by their cumulative resource consumption. The Sample_Statement_Text column shows an example of the query structure that matches the query hash, but it should be read without regard to specific values in the statement. For example, if a statement contains WHERE Id = 5, you might read it in its more generic form: WHERE Id = @some_value.
SELECT TOP 5
query_stats.query_hash AS Query_Hash,
SUM(query_stats.total_worker_time) / SUM(query_stats.execution_count) AS Avg_CPU_Time,
MIN(query_stats.statement_text) AS Sample_Statement_Text
FROM (
SELECT QS.*,
SUBSTRING(ST.text, (QS.statement_start_offset / 2) + 1, (
(
CASE statement_end_offset
WHEN - 1
THEN DATALENGTH(ST.text)
ELSE QS.statement_end_offset
END - QS.statement_start_offset
) / 2
) + 1) AS statement_text
FROM sys.dm_exec_query_stats AS QS
CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) AS ST
) AS query_stats
GROUP BY query_stats.query_hash
ORDER BY 2 DESC;
B. Return row count aggregates for a query
The following example returns row count aggregate information (total rows, minimum rows, maximum rows, and last rows) for queries.
SELECT qs.execution_count,
SUBSTRING(qt.text, qs.statement_start_offset / 2 + 1, (
CASE
WHEN qs.statement_end_offset = - 1
THEN LEN(CONVERT(NVARCHAR(max), qt.text)) * 2
ELSE qs.statement_end_offset
END - qs.statement_start_offset
) / 2) AS query_text,
qt.dbid,
dbname = DB_NAME(qt.dbid),
qt.objectid,
qs.total_rows,
qs.last_rows,
qs.min_rows,
qs.max_rows
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt
WHERE qt.text LIKE '%SELECT%'
ORDER BY qs.execution_count DESC;