Sql server 2008R2 cluster (active-passive) prerequistites

Hi All,
Please any one can help me in exact prerequisites for installing sql server 2008R2 cluster server(two node).
Thanks in advance.
Maheshwar Reddy

Hi Please find the pre-requisites for SQL server cluster installation .
Before Installing SQL cluster we need to have a Windows Cluster with required shared storage space and DTC Service configured in Windows
Cluster.
Be ready with the plan of where the SQL to be installed and where the Database, Log, Temp DB and Backup are to be stored.
If you require SOP for this please share your mail id .i will send the same .

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Apply monthly Windows 2008 r2 updates within SQL Server 2008 cluster

Hello is applying Windows updates within 2 node SQL Server 2008 cluster (active-passive) as simple as download/install the windows update on the passive node, then failover, then apply on other node, and then fail back over ?...or are there other needed/recommended
steps ? Thanks in advance.

Thanks for your reply Shanky_621 much appreciated.
In your link provided http://support.microsoft.com/kb/174799 it looks like the steps order is slightly different from this link of
http://technet.microsoft.com/en-us/library/cc731291.aspx which mentions...
"...where the recommended sequence is to move all services and applications off of the node, pause the node, then apply software updates to the node."
...does it matter which is done first ('Pause' or 'move Services/Application') or can I simply go to the Passive node (say 'B' where there are no Services or Applications currently on it), 'Pause' it, apply the Windows updates, then 'Resume' it, &
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Hi all,
can I have a 2 node cluster (Windows Server 2008R2 Datacenter Edition: node_1 and node_2) forming a failover cluster with 2 instances of SQL Server 2008R2 Standard Edition (instance_A and instance_B) with:
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Following thread is on similar topic:
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Services configuration for sql server 2008r2 in a Windows Cluster

Hello,
We have a Windows Server 2008 Cluster with Sql Server 2008r2 installed on node 2; when node 2 fails (we don't still know why, it's a 'bluescreen' long history), the service goes from node2 to node1, but sometimes the services are not automatically activated.
What is the theoretical startup settings for sql services (for the sql and the agent), manual, disabled, automatic... ?
Also, sometimes, the service for the sql server in node2 stops, but we don't know why, and we are not able to see any significant information on the event viewer. How can we trace why Sql Server stopped ?
Thanks !

>What is the theoretical startup settings for sql services
Manual. The cluster will start them.
>How can we trace why Sql Server stopped ?
Look in the SQL Server Log.
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Howto take SQL Server 2005 Cluster AND Cluster Group Offline

I need to update firmware on the backend storage used by our Active/Passive SQL Server 2005 Cluster. The first step in the process states that all I/O to the disks should be stopped. Per that, I need to take the the SQL Server cluster offline AND the cluster group; however, I then need to use one of the servers that participates in the cluster to perform the upgrade on the storage array. Using the process (which doesn't account for having to use one of clustered servers to perform updates) outlined at http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1550288&SiteID=1 as a basis, below is my best guess regarding what I will need to do:
Shutdown:
1. Backup all of your databases prior to the outage and ensure they are in a safe place (NOT on the disk drives in the cluster)
2. Take the SQL Server group OFFLINE. This will cleanly shutdown the SQL Server and it will remain offline when you power the machine back on.
3. Once SQL Server is offline, power off the node which does NOT have the cluster resource currently running on it
4. Save the node which is running the cluster group for last - make a note of this machine as it will be the first one you power back on. MY ADDITION: Before powering it down, set the cluster service to manual so that when you restart the server to perform the storage array maintenance, the cluster will not be running - and likewise not generating I/O against the disk array.
MY ADDITION: 5. Restart the server from step 4. Takes the cluster offline "cleanly" and brings the server back on line so that the storage array maintenance can be performed.
6. Update the firmware on the storage array. After that is complete, set the cluster service back to "Automatic".
Start up:
1. Restart the server. Per the previous steps, the server to be restarted will be the server that last hosted the cluster group and the one used to update the firmware on the storage array.
2. RDP into the node, open cluster administrator, and verify that the cluster came back online successfully and everything looks clean
3. Power on the second node.
4. Failover the cluster group across each node in the cluster and validate that everything looks OK
5. Bring your SQL Server groups back online
6. Validate that everything is operational
Is there a better way to do this or official documentation for the process?
Thanks.

FYI: I did use the process outlined above to briing the cluster offline, perform updates, and bring it back online. It worked as I had hoped. As a test, I had also done the same on a test [non-SQL] cluster prior to making the updates to our SQL cluster. Is it the best way to do it? Who knows. Did it work? Yes.

How to install a DB Instance in a SQL Server 2005 cluster

Hi all,
I have an installation scenaro is install SCS/CI in machine A, and DB instance on a already exist cluster. This is based on Windows 2003 SR2 and SQL Server 2005 cluster. But now after i finish SCS, i don't know how to install the DB instance. Do i just need sign in the active node of the DB cluster and start the sapinst.exe. I am worry about any of my mis-action will broke the cluster.. Appreciate any tips or idea about it, thanks.
Peter

directly start sapinst.exe on the cluster node.

Unable to edit maintenance plan Sql Server 2008R2

Hi All,
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Microsoft SQL Server Management Studio is unable to load this document.:
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I am setting up 2 Report Services (SSRS) in SQL Failover Clustering (Version: 2012SP1) on Windows 2012, as part of scale out architecture.
There are 2 options to configure the service account for SSRS:
Option 1) Using domain accounts, as what I have done for DB Engine and SQL Agent.
Option 2) accept the default, which is virtual account for SSRS. Per documentation URL:
http://msdn.microsoft.com/en-us/library/ms143504.aspx
which is the recommended one? is it option 2?
There is security note on above URL as well, but does not clearly mention that option 1 is not recommended.
Security Note: Always run SQL Server services by using the lowest possible user rights. Use a MSA or virtual account when possible. When MSA and virtual accounts are not possible, use a specific low-privilege user account or domain account instead
of a shared account for SQL Server services. Use separate accounts for different SQL Server services. Do not grant additional permissions to the SQL Server service account or the service groups. Permissions will be granted through group membership or granted
directly to a service SID, where a service SID is supported.
Thanks very much for your help!

Hi Luo Donghua,
In SQL Server Failover Cluster Instance, personally two options can run well. If you use the virtual account for SQL Server Reporting Service. Virtual accounts in Windows Server 2008 R2 and Windows 7 are managed local accounts that provide the features to
simplify service administration. The virtual account is auto-managed, and the virtual account can access the network in a domain environment.
Of cause, you can also use domain accounts in your clustering.
Just make sure your service account is set up here, or that it is using a proper built-in account.For more information, see:http://ermahblerg.com/2012/11/08/cluster-ssrs-in-2008/
Thanks,
Sofiya Li
Sofiya Li
TechNet Community Support

Will Cumulative Update 12 for SQL Server 2008R2 SP2 fix: Warning: Unable to Verify TimeStamp for Path\ProgramName?

Hello,
I had a server crash recently and our outsource hosting tech support suggested applying Cumulative Upade 12 for SQL server 2008R2 SP2 to fix the issue. The exception from our dump file "Warning: Unable to Verify TimeStamp for Path\ProgramName"
is not in the list of hotfixes for this CU. Do you know if this will fix this issue? The CU warns not to apply the CU if your issue id not addressed by the CU. Here is a portion of the dump file with the relevant error:
This dump file has an exception of interest stored in it.
The stored exception information can be accessed via .ecxr.
(7e8.2ab4): Unknown exception - code 000042ac (first/second chance not available)
ntdll!NtWaitForSingleObject+0xa:
00000000`777412fa c3 ret
0:240> .sympath srv*c:\Websymbols*http://msdl.microsoft.com/download/symbols;
Symbol search path is: srv*c:\Websymbols*http://msdl.microsoft.com/download/symbols
Expanded Symbol search path is: srv*c:\websymbols*http://msdl.microsoft.com/download/symbols
0:240> .reload /f
.Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\sqlservr.exe, Win32 error 0n2
*** WARNING: Unable to verify timestamp for sqlservr.exe
..........Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\sqlos.dll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for sqlos.dll
...............Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\opends60.dll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for opends60.dll
.......Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\BatchParser.dll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for BatchParser.dll
....Unable to load image C:\Program Files\Microsoft SQL Server\100\Shared\instapi10.dll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for instapi10.dll
*** ERROR: Module load completed but symbols could not be loaded for instapi10.dll
..Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\Resources\1033\sqlevn70.rll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for sqlevn70.rll
*** ERROR: Module load completed but symbols could not be loaded for sqlevn70.rll
Press ctrl-c (cdb, kd, ntsd) or ctrl-break (windbg) to abort symbol loads that take too long.
Run !sym noisy before .reload to track down problems loading symbols.
.................Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\ftimport.dll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for ftimport.dll
.Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\msfte.dll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for msfte.dll
*** ERROR: Module load completed but symbols could not be loaded for msfte.dll
...........Unable to load image C:\Windows\System32\sqlncli10.dll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for sqlncli10.dll
...Unable to load image C:\Windows\System32\1033\SQLNCLIR10.RLL, Win32 error 0n2
*** WARNING: Unable to verify timestamp for SQLNCLIR10.RLL
*** ERROR: Module load completed but symbols could not be loaded for SQLNCLIR10.RLL
..Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\xpsqlbot.dll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for xpsqlbot.dll
.Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\XPStar.DLL, Win32 error 0n2
*** WARNING: Unable to verify timestamp for XPStar.DLL
.Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\sqlscm.dll, Win32 error 0n2
*** WARNING: Unable to verify timestamp for sqlscm.dll
...*** ERROR: Module load completed but symbols could not be loaded for odbcint.dll
...Unable to load image C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn\Resources\1033\XPStar.RLL, Win32 error 0n2
*** WARNING: Unable to verify timestamp for XPStar.RLL
Thank you,
Steve -

The error message appears to be related to a debug session and not come from the actual crash.
So all I know is that you hade a server crash. I don't even know exactly what that means. Did Windows bite the dust? Or was it only SQL Server?
Assuming the latter, I would expect the SQL Server errorlog to have some information (and that would be ERRORLOG.1 or earlier, since the server have been restarted), but if SQL Server died the output may be incomplete.
There may be also dump files, but as I rarely look into these, I am not sure how to interpret them. But I am quite confident that "Unable to verify TimeStamp..." is not the reason SQL Server went down.
I would suggest the following course:
* If the server is not critical, do nothing. As long as it has onlyl happened once, it has only happened once.
* If the server is critical, open a case with Microsoft if you are not able to figure out the reason yourself. The key here is "Unknown exception - code 000042ac".
* If it happens again, you should absolutely open a case. An important thing here is whether the stack dump is identical or something different. If the stack dumps are identical, you may have hit a bug in SQL Server or the OS, and applying CUs or OS
fixes could help if it is a known issue. If the stack dump is something else, you have ghosts in the machine - that is, bad hardware.
Erland Sommarskog, SQL Server MVP, [email protected]

SQL Server Failover Cluster Questions

Dear All,
            I am building a two-node failover cluster on SQL Server 2012 SP1 (inside Hyper-V as a Guest Cluster) and want clarification on few things that I am facing.
1.  I am receiving MSDTC Warning. I can go ahead and create the cluster, but want to understand whether this MSDTC is to be configured as a role on the cluster or not. I plan to run SCVMM, SCOM, Orchestrator and Windows Azure Pack Databases
and Reports through it so in such a scenario, do I need MSDTC? If yes, how much should be the size of the MSDTC Drive? Is following process correct?
http://www.sqlnotebook.info/configure-msdtc-on-windows-cluster-2012/
2. During First Node configuration, one needs to provide the "SQL CLUSTER RESEOURCE GROUP NAME". Does it have any bearing on how it will be accessed by other servers for databases and logs? or is it just how the cluster resource group
would be named? would it be required for every instance that is created inside the cluster? Just to be clear, so one can name it according to the instance name.
3. During the instance creation, one needs to provide "SQL Server Network Name". As stated above, I plan to run SCVMM, SCOM, Orchestrator and Windows Azure Pack Databases and Reports through it, so would I be required to provide this
for all instances that I create or this is only required once in the cluster:
4. During the instance creation, one needs to provide the features required for installation i.e. instance features and shared features. As stated above, I plan to run SCVMM, SCOM, Orchestrator and Windows Azure Pack Databases and Reports through
it, so which features should be selected? so that there is less workload on the server.
5. All the instances use TempDB for databases that are present inside it. What would be the best practice with respect to TempDB. One TempDB for all instance on the servers on a separate LUN or all instance having their own TempDB LUN?  What
should be the ideal size of the TempDB LUN?
6. Should all the disks required for DBs and Logs be added to Cluster?  Should they be added normal disks or CSV Volumes?
Thanks in advance.

Hello,
1.You can run the Microsoft Distributed Transaction Coordinator service (MSDTC) as a clustered resource on a failover cluster server for increased reliability, based on the failover capabilities of the clustered servers. You can
refer to the MSDTC section of the following blog about determine whether the Microsoft Distributed Transaction Coordinator (MSDTC) cluster resource must be created.
Reference:http://msdn.microsoft.com/en-us/library/ms189910.aspx#MSDTC
2. The Cluster Resource Group is where SQL Server failover cluster resource will be placed. Each clustered SQL Server will belong to a Failover
Cluster Resource Group. For example, if you had configure a two node SQL Server Cluster, each clustered instance on the two node belong to a same Cluster Resource Group.
You can change the Cluster Resource Group name, but notes the following name is reserved and already used as Resource Group names: Available Storage, Cluster Group.
3. Each SQL Server cluster is assigned a virtual Network name and IP address, which client applications use to connect to the clustered SQL Server.
4. Not familiar with SCVMM, SCOM, Orchestrator, but you should install the Database Engine Services and SQL Server Management tools.If you want to use SQL Server Reporting Services, you can install Reporting Servers, but Report Server service cannot participate
in a failover cluster.
5. You can use isolated disk for user database and temp DB of each SQL Server Cluster
6. Yes. You should use Cluster Disks which add to Clustered Shared Volumes to host the data file and log of databases.
http://www.pythian.com/blog/how-to-install-a-clustered-sql-server-2012-instance-step-by-step-part-1/
Regards,
Fanny Liu
Fanny Liu
TechNet Community Support

SQL Server 2008R2 SP2 Query optimizer memory leak ?

It looks like we are facing a SQL Server 2008R2 queery optimizer memory leak.
We have below version of SQL Server
Microsoft SQL Server 2008 R2 (SP2) - 10.50.4000.0 (X64)
Jun 28 2012 08:36:30
Copyright (c) Microsoft Corporation
Standard Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1)
The instance is set MAximum memory tro 20 GB.
After executing a huge query (2277 kB generated by IBM SPSS Clementine) with tons of CASE and a lot of AND/OR statements in the WHERE and CASE statements and muliple subqueries the server stops responding on Out of memory in the internal pool
and the query optimizer has allocated all the memory.
From Management Data Warehouse we can find that the query was executed at
7.11.2014 22:40:57
Then at 1:22:48 we recieve FAIL_PACE_ALLOCATION 1
2014-11-08 01:22:48.70 spid75       Failed allocate pages: FAIL_PAGE_ALLOCATION 1
And then tons of below errors
2014-11-08 01:24:02.22 spid87      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:02.22 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:02.22 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:02.30 Server      Error: 17312, Severity: 16, State: 1.
2014-11-08 01:24:02.30 Server      SQL Server is terminating a system or background task Fulltext Host Controller Timer Task due to errors in starting up the task (setup state 1).
2014-11-08 01:24:02.22 spid74      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:02.22 spid74      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 Server      Error: 17312, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:13.22 spid87      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:13.22 spid87      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 spid63      Error: 701, Severity: 17, State: 130.
2014-11-08 01:24:13.22 spid63      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 spid57      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:13.22 spid57      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:18.26 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:24.43 spid81      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:24.43 spid81      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:18.25 Server      Error: 18052, Severity: -1, State: 0. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:18.25 Server      BRKR TASK: Operating system error Exception 0x1 encountered.
2014-11-08 01:24:30.11 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:30.11 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:35.18 spid57      Error: 701, Severity: 17, State: 131.
2014-11-08 01:24:35.18 spid57      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:35.18 spid71      Error: 701, Severity: 17, State: 193.
2014-11-08 01:24:35.18 spid71      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:35.18 Server      Error: 17312, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:35.41 Server      Error: 17312, Severity: 16, State: 1.
2014-11-08 01:24:35.41 Server      SQL Server is terminating a system or background task SSB Task due to errors in starting up the task (setup state 1).
2014-11-08 01:24:35.71 Server      Error: 17053, Severity: 16, State: 1.
2014-11-08 01:24:35.71 Server      BRKR TASK: Operating system error Exception 0x1 encountered.
2014-11-08 01:24:35.71 spid73      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:35.71 spid73      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:46.30 Server      Error: 17312, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:51.31 Server      Error: 17053, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:51.31 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:51.31 Logon       Error: 18052, Severity: -1, State: 0. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
Last error message is half an hour after the inital Out of memory at 2014-11-08 01:52:54.03. Then the Instance is completely shut down
From the memory information in the error log we can see that all the memory is consumed by the QUERY_OPTIMIZER
Buffer Pool                                   Value
Committed                                   2621440
Target                                      2621440
Database                                     130726
Dirty                                          3682
In IO
0
Latched
1
Free
346
Stolen                                      2490368
Reserved                                          0
Visible                                     2621440
Stolen Potential                                  0
Limiting Factor                                  17
Last OOM Factor                                   0
Last OS Error                                     0
Page Life Expectancy                             28
2014-11-08 01:22:48.90 spid75
Process/System Counts                         Value
Available Physical Memory                29361627136
Available Virtual Memory                 8691842715648
Available Paging File                    51593969664
Working Set                               628932608
Percent of Committed Memory in WS               100
Page Faults                                48955000
System physical memory high                       1
System physical memory low                        0
Process physical memory low                       1
Process virtual memory low                        0
MEMORYCLERK_SQLOPTIMIZER (node 1)                KB
VM Reserved                                       0
VM Committed                                      0
Locked Pages Allocated                            0
SM Reserved                                       0
SM Committed                                      0
SinglePage Allocator                       19419712
MultiPage Allocator                             128
Memory Manager                                   KB
VM Reserved                               100960236
VM Committed                                 277664
Locked Pages Allocated                     21483904
Reserved Memory                                1024
Reserved Memory In Use                            0
On the other side MDW reports that the MEMORYCLERK_SQLOPTIMIZER increases since the execution of the query up to the point of OUTOF MEMORY, but the Average value is 54.7 MB during that period as can be seen on attached graph.
We have encountered this issue already two times (every time the critical query is executed).

Hi,
This does seems to me kind of memory Leak and actually it is from SQL Optimizer which leaked memory from buffer pool so much that it did not had any memory to be allocated for new page.
MEMORYCLERK_SQLOPTIMIZER (node 1)                KB
VM Reserved                                       0
VM Committed                                      0
Locked Pages Allocated                            0
SM Reserved                                       0
SM Committed                                      0
SinglePage Allocator                       19419712
MultiPage Allocator                             128
Can you post complete DBCC MEMORYSTATUS output which was generated in errorlog. Is this the only message in errorlog or there are some more messages before and after it.
select (SUM(single_pages_kb)*1024)/8192 as total_stolen_pages, type
from sys.dm_os_memory_clerks
group by typeorder by total_stolen_pages desc
and
select sum(pages_allocated_count * page_size_in_bytes)/1024,type from sys.dm_os_memory_objects
group by type
If you can post the output of above two queries with dbcc memorystaus output on some shared drive and share location with us here. I would try to find out what is leaking memory.
You can very well apply SQL Server 2008 r2 SP3 and see if this issue subsides but I am not sure whether this is fixed or actually it is a bug.
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
My Technet Wiki Article
MVP

How could I create a "Linked Server" link from SQL Server 2008R2 64-Bit to Oracle Database 11.2 64-Bit?

How could I create a "Linked Server" link from SQL Server 2008R2 64-Bit to Oracle Database 11.2 64-Bit?
Let's say the SQL Server and Oracle Database are in the same Company Internet Network.
I have the code, but I do not know how to use it. Such as what is System DSN Name? Where could I get it. What does it look like?
Do I need to install any Oracle Client Software in order to link from SQL Server to Oracle? Or SQL Server has the built-in drivers installed already that I can directly create a Linked Server from SQL Server to Oracle?
I need to know details. Thanks.
USE master
go
EXEC sp_addlinkedserver
     @server  = '{Linked Server Name}'
    ,@srvproduct = '{System DSN Name}'
    ,@provider  = 'MSDASQL'
    ,@datasrc  = '{System DSN Name}'
EXEC sp_addlinkedsrvlogin
     @rmtsrvname = '{Linked Server Name}'
    ,@useself  = 'False'
    ,@locallogin = NULL
    ,@rmtuser  = '{Oracle User Name}'
    ,@rmtpassword = '{Oracle User Password}'

You need an OLE DB provider for Oracle. There is one that ships with Windows, but it only supports very old versions of Oracle. Oracle has an OLE DB provider that you can use. I don't know if it's part of Oracle Client or how it is bundled.
You should not use MSDASQL or any DSN.
Erland Sommarskog, SQL Server MVP, [email protected]

Does a sql server client application needs to be modified to allow it to have benefits of running on a SQL Server 2012 cluster?

I have a client application in c++ which interacts with sql server database. My question is whether I need to make any changes to the client application code to allow it to have the benefits of running on a SQL server 2012 cluster environment.
To elaborate more on my query my concern is for e.g if my application has called an api to execute a sql query and during
the execution of this query the sql server (part of the cluster) goes down then as per my understanding the sql cluster would ensure that another node takes up the task from the current sql server which has gone down. Is this transition transparent to the
client application or in such a case my client application needs to again make a new connection and again execute the query?

Hello,
Just as Shanky post above, When you connected to a database in an availability group and specify the availability group listener in the connection string, if the availability group fails over, the original connection is broken, your application
should try a new connection after the failover.
So, when connect to an availability group, please try to increasing connection timeout and implementing connection retry logic to increase the probability of successful connection.
Reference:SqlClient Support for High Availability, Disaster Recovery
Regards,
Fanny Liu
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Fanny Liu
TechNet Community Support

SQL Server 2008R2 vs 2012 OLTP performance difference - log flushes size different

Hi all,
I'm doing some performance test against 2 identical virtual machine (each VM has the same virtual resources and use the same physical hardware).
The 1° VM has Windows Server 2008R2 and SQL Server 2008R2 Standard Edition
the 2° VM has Windows Server 2012R2 and SQL Server 2012 SP2 + CU1 Standard Edition
I'm using hammerDB (http://hammerora.sourceforge.net/) has benchmark tool to simulate TPC-C test.
I've noticed a significative performance difference between SQL2008R2 and SQL2012, 2008R2 does perform better. Let's explain what I've found:
I use a third VM as client where HammerDB software is installed, I run the test against the two SQL Servers (one server at a time), in SQL2008R2 I reach an higher number of transaction per minutes.
HammerDB creates a database on each database server (so the database are identical except for the compatibility level), and then HammerDB execute a sequence of query (insert-update) simulating the TPC-C standard, the sequence is identical on both servers.
Using perfmon on the two servers I've found a very interesting thing:
In the disk used by the hammerDB database's log (I use separate disk for data and log) I've monitored the Avg. Disk Bytes/Write and I've noticed tha the SQL2012 writes to the log with smaller packet (let's say an average of 3k against an average of 5k written
by the SQL 2008R2).
I've also checked the value of Log flushes / sec on both servers and noticed that SQL2012 do, on average, more log flushes per second, so more log flushes of less bytes...
I've searched for any documented difference in the way log buffers are flushed to disk between 2008r2 and 2012 but found no difference.
Anyone can piont me in the correct direction?

Andrea,
1) first of all fn_db_log exposes a lot of fields that do not exist in SQL2008R2
This is correct, though I can't elaborate as I do not know how/why the changes were made.
2) for the same DML or DDL the number of log record generated are different
I thought as much (but didn't know the workload).
I would like to read and to study what this changes are! Have you some usefu link to interals docs?
Unfortunately I cannot offer anything as the function used is currently undocumented and there are no published papers or documentation by MS on reading log records/why/how. I would assume this to all be NDA information by Microsoft.
Sorry I can't be of more help, but you at least know that the different versions do have behavior changes.
Sean Gallardy | Blog | Microsoft Certified Master

Sql server 2008R2 cluster (active-passive) prerequistites

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