How is MSSQL using memory?
- Memory is one the most important factor affecting MSSQL performance.
- As an administrator, you should be monitoring the memory regularly. When Microsoft SQL Server runs out of memory, it will use virtual memory: ie: disk paging, which will grind MSSQL to a halt.
- You can keep track of the memory with dbcc memorystatus.
Applies to:
- Microsoft SQL Server 2005
- Microsoft SQL Server 2008
Memorystatus
Memory Manager KB
------------------------------ --------------------
VM Reserved 538308
VM Committed 129888
AWE Allocated 0
Reserved Memory 1024
Reserved Memory In Use 0
(5 row(s) affected)
Memory node Id = 0 KB
------------------------------ --------------------
VM Reserved 534148
VM Committed 125880
AWE Allocated 0
MultiPage Allocator 7688
SinglePage Allocator 21808
(5 row(s) affected)
MEMORYCLERK_SQLGENERAL (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 952
MultiPage Allocator 1544
(7 row(s) affected)
MEMORYCLERK_SQLBUFFERPOOL (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 523596
VM Committed 116008
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 0
MultiPage Allocator 128
(7 row(s) affected)
MEMORYCLERK_SQLOPTIMIZER (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 128
MultiPage Allocator 72
(7 row(s) affected)
MEMORYCLERK_SQLUTILITIES (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 120
VM Committed 120
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 128
MultiPage Allocator 0
(7 row(s) affected)
MEMORYCLERK_SQLSTORENG (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 832
VM Committed 832
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 608
MultiPage Allocator 72
(7 row(s) affected)
MEMORYCLERK_SQLCONNECTIONPOOL (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 192
MultiPage Allocator 0
(7 row(s) affected)
MEMORYCLERK_SQLCLR (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
MEMORYCLERK_SQLSERVICEBROKER (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 64
MultiPage Allocator 192
(7 row(s) affected)
MEMORYCLERK_SQLHTTP (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
MEMORYCLERK_SNI (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 16
(7 row(s) affected)
MEMORYCLERK_FULLTEXT (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 16
MultiPage Allocator 0
(7 row(s) affected)
MEMORYCLERK_SQLXP (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 16
MultiPage Allocator 0
(7 row(s) affected)
MEMORYCLERK_HOST (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 16
MultiPage Allocator 0
(7 row(s) affected)
MEMORYCLERK_SOSNODE (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 1136
MultiPage Allocator 5424
(7 row(s) affected)
MEMORYCLERK_SQLSERVICEBROKERTRANSPORT (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 24
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_OBJCP (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 216
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_SQLCP (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 9672
MultiPage Allocator 48
(7 row(s) affected)
CACHESTORE_PHDR (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 4176
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_XPROC (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 40
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_TEMPTABLES (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 16
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_NOTIF (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 16
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_VIEWDEFINITIONS (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 16
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_XMLDBTYPE (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_XMLDBELEMENT (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_XMLDBATTRIBUTE (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_STACKFRAMES (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 0
MultiPage Allocator 8
(7 row(s) affected)
CACHESTORE_BROKERTBLACS (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 224
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_BROKERKEK (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_BROKERDSH (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_BROKERUSERCERTLOOKUP (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_BROKERRSB (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_BROKERREADONLY (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 72
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_BROKERTO (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_EVENTS (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 16
MultiPage Allocator 0
(7 row(s) affected)
CACHESTORE_SYSTEMROWSET (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 864
MultiPage Allocator 0
(7 row(s) affected)
USERSTORE_SCHEMAMGR (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 552
MultiPage Allocator 0
(7 row(s) affected)
USERSTORE_DBMETADATA (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 1544
MultiPage Allocator 0
(7 row(s) affected)
USERSTORE_TOKENPERM (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 40
MultiPage Allocator 0
(7 row(s) affected)
USERSTORE_OBJPERM (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 176
MultiPage Allocator 0
(7 row(s) affected)
USERSTORE_SXC (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 8
MultiPage Allocator 0
(7 row(s) affected)
OBJECTSTORE_LBSS (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 48
MultiPage Allocator 0
(7 row(s) affected)
OBJECTSTORE_SNI_PACKET (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 120
MultiPage Allocator 48
(7 row(s) affected)
OBJECTSTORE_SERVICE_BROKER (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 256
MultiPage Allocator 0
(7 row(s) affected)
OBJECTSTORE_LOCK_MANAGER (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 1024
VM Committed 1024
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 328
MultiPage Allocator 0
(7 row(s) affected)
Buffer Distribution Buffers
------------------------------ -----------
Stolen 419
Free 53
Cached 2307
Database (clean) 11449
Database (dirty) 108
I/O 0
Latched 0
(7 row(s) affected)
Buffer Counts Buffers
------------------------------ --------------------
Committed 14336
Target 24244
Hashed 11557
Stolen Potential 58849
External Reservation 0
Min Free 32
Visible 24244
Available Paging File 83403
(8 row(s) affected)
Procedure Cache Value
------------------------------ -----------
TotalProcs 208
TotalPages 1769
InUsePages 28
(3 row(s) affected)
Global Memory Objects Buffers
------------------------------ --------------------
Resource 138
Locks 44
XDES 8
SETLS 1
SE Dataset Allocators 2
SubpDesc Allocators 1
SE SchemaManager 68
SQLCache 39
Replication 2
ServerGlobal 25
XP Global 2
SortTables 2
(12 row(s) affected)
Query Memory Objects Value
------------------------------ -----------
Grants 0
Waiting 0
Available (Buffers) 7865
Maximum (Buffers) 7865
Limit 17286
Next Request 0
Waiting For 0
Cost 0
Timeout 0
Wait Time 0
Last Target 18195
(11 row(s) affected)
Small Query Memory Objects Value
------------------------------ -----------
Grants 0
Waiting 0
Available (Buffers) 906
Maximum (Buffers) 906
Limit 906
(5 row(s) affected)
Optimization Queue Value
------------------------------ --------------------
Overall Memory 159031296
Target Memory 134381568
Last Notification 1
Timeout 6
Early Termination Factor 5
(5 row(s) affected)
Small Gateway Value
------------------------------ --------------------
Configured Units 4
Available Units 4
Acquires 0
Waiters 0
Threshold Factor 250000
Threshold 250000
(6 row(s) affected)
Medium Gateway Value
------------------------------ --------------------
Configured Units 1
Available Units 1
Acquires 0
Waiters 0
Threshold Factor 12
(5 row(s) affected)
Big Gateway Value
------------------------------ --------------------
Configured Units 1
Available Units 1
Acquires 0
Waiters 0
Threshold Factor 8
(5 row(s) affected)
MEMORYBROKER_FOR_CACHE Value
-------------------------------- --------------------
Allocations 2306
Rate 0
Target Allocations 18297
Future Allocations 0
Last Notification 1
(5 row(s) affected)
MEMORYBROKER_FOR_STEAL Value
-------------------------------- --------------------
Allocations 413
Rate 0
Target Allocations 16404
Future Allocations 0
Last Notification 1
(5 row(s) affected)
MEMORYBROKER_FOR_RESERVE Value
-------------------------------- --------------------
Allocations 0
Rate 0
Target Allocations 19413
Future Allocations 4321
Last Notification 1
(5 row(s) affected)
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
- Memory Manager: shows overall memory consumption by SQL Server
- Memory node Id: usage for each memory node: summary of memory usage
- MEMORYCLERK_SQLGENERAL: aggregate for each memory node: aggregate memory
- Buffer distribution: the distribution of 8-kilobyte (KB) buffers in the buffer pool
- Buffer Counts: Buffer pool details from sys.dm_os_buffer_descriptors
- Procedure cache: Size and type
- Global memory objects: size of the global memory objects
- Query memory objects: snapshot of the query memory usage: the workspace memory
- Optimization Queue: summary of the users who are trying to optimize queries at the same time
- MEMORYBROKER_FOR_CACHE: control cached memory, stolen memory, and reserved memory
