When does SQL Server warn about an Excessive Memory Grant?
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What are the conditions that produce an "Excessive Grant" execution plan warning?
The query memory grant detected "ExcessiveGrant", which may impact the reliability. Grant size: Initial 5128 KB, Final 5128 KB, Used 16 KB.
SSMS
Plan Explorer
Showplan xml
<Warnings>
<MemoryGrantWarning GrantWarningKind="Excessive Grant"
RequestedMemory="5128" GrantedMemory="5128" MaxUsedMemory="16" />
</Warnings>
sql-server execution-plan warning memory-grant
asked Jan 28 at 12:15
Paul White♦Paul White
52k14278450
add a comment |
What are the conditions that produce an "Excessive Grant" execution plan warning?
The query memory grant detected "ExcessiveGrant", which may impact the reliability. Grant size: Initial 5128 KB, Final 5128 KB, Used 16 KB.
SSMS
Plan Explorer
Showplan xml
<Warnings>
<MemoryGrantWarning GrantWarningKind="Excessive Grant"
RequestedMemory="5128" GrantedMemory="5128" MaxUsedMemory="16" />
</Warnings>
sql-server execution-plan warning memory-grant
asked Jan 28 at 12:15
Paul White♦Paul White
52k14278450
add a comment |
What are the conditions that produce an "Excessive Grant" execution plan warning?
The query memory grant detected "ExcessiveGrant", which may impact the reliability. Grant size: Initial 5128 KB, Final 5128 KB, Used 16 KB.
SSMS
Plan Explorer
Showplan xml
<Warnings>
<MemoryGrantWarning GrantWarningKind="Excessive Grant"
RequestedMemory="5128" GrantedMemory="5128" MaxUsedMemory="16" />
</Warnings>
sql-server execution-plan warning memory-grant
asked Jan 28 at 12:15
Paul White♦Paul White
52k14278450
What are the conditions that produce an "Excessive Grant" execution plan warning?
The query memory grant detected "ExcessiveGrant", which may impact the reliability. Grant size: Initial 5128 KB, Final 5128 KB, Used 16 KB.
SSMS
Plan Explorer
Showplan xml
<Warnings>
<MemoryGrantWarning GrantWarningKind="Excessive Grant"
RequestedMemory="5128" GrantedMemory="5128" MaxUsedMemory="16" />
</Warnings>
sql-server execution-plan warning memory-grant
sql-server execution-plan warning memory-grant
asked Jan 28 at 12:15
Paul White♦Paul White
52k14278450
asked Jan 28 at 12:15
Paul White♦Paul White
52k14278450
asked Jan 28 at 12:15
Paul White♦Paul White
52k14278450
asked Jan 28 at 12:15
Paul White♦Paul White
52k14278450
asked Jan 28 at 12:15
Paul White♦Paul White
52k14278450
52k14278450
add a comment |
add a comment |
1 Answer
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To produce this warning:
- The maximum used memory must be less than 5% of the granted memory; AND
- The query must use the regular (not small) resource semaphore
To use the regular resource semaphore the query must:
- Have granted memory over 5MB (5120 KB, 640 x 8KB pages); OR
- Have a total estimated plan cost of over 3 units and not be a trivial plan
Server version requirements:
- SQL Server 2014 SP2 (12.0.5000) or later
- SQL Server 2016 SP1 (13.0.4001) or later
- SQL Server 2017 RTM (14.0.1000) or later
answered Jan 28 at 12:15
Paul White♦Paul White
52k14278450
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
To produce this warning:
- The maximum used memory must be less than 5% of the granted memory; AND
- The query must use the regular (not small) resource semaphore
To use the regular resource semaphore the query must:
- Have granted memory over 5MB (5120 KB, 640 x 8KB pages); OR
- Have a total estimated plan cost of over 3 units and not be a trivial plan
Server version requirements:
- SQL Server 2014 SP2 (12.0.5000) or later
- SQL Server 2016 SP1 (13.0.4001) or later
- SQL Server 2017 RTM (14.0.1000) or later
answered Jan 28 at 12:15
Paul White♦Paul White
52k14278450
add a comment |
To produce this warning:
- The maximum used memory must be less than 5% of the granted memory; AND
- The query must use the regular (not small) resource semaphore
To use the regular resource semaphore the query must:
- Have granted memory over 5MB (5120 KB, 640 x 8KB pages); OR
- Have a total estimated plan cost of over 3 units and not be a trivial plan
Server version requirements:
- SQL Server 2014 SP2 (12.0.5000) or later
- SQL Server 2016 SP1 (13.0.4001) or later
- SQL Server 2017 RTM (14.0.1000) or later
answered Jan 28 at 12:15
Paul White♦Paul White
52k14278450
add a comment |
To produce this warning:
- The maximum used memory must be less than 5% of the granted memory; AND
- The query must use the regular (not small) resource semaphore
To use the regular resource semaphore the query must:
- Have granted memory over 5MB (5120 KB, 640 x 8KB pages); OR
- Have a total estimated plan cost of over 3 units and not be a trivial plan
Server version requirements:
- SQL Server 2014 SP2 (12.0.5000) or later
- SQL Server 2016 SP1 (13.0.4001) or later
- SQL Server 2017 RTM (14.0.1000) or later
answered Jan 28 at 12:15
Paul White♦Paul White
52k14278450
To produce this warning:
- The maximum used memory must be less than 5% of the granted memory; AND
- The query must use the regular (not small) resource semaphore
To use the regular resource semaphore the query must:
- Have granted memory over 5MB (5120 KB, 640 x 8KB pages); OR
- Have a total estimated plan cost of over 3 units and not be a trivial plan
Server version requirements:
- SQL Server 2014 SP2 (12.0.5000) or later
- SQL Server 2016 SP1 (13.0.4001) or later
- SQL Server 2017 RTM (14.0.1000) or later
answered Jan 28 at 12:15
Paul White♦Paul White
52k14278450
edited Jan 31 at 9:21
answered Jan 28 at 12:15
Paul White♦Paul White
52k14278450
answered Jan 28 at 12:15
Paul White♦Paul White
52k14278450
answered Jan 28 at 12:15
Paul White♦Paul White
52k14278450
52k14278450
add a comment |
add a comment |
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