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Archive for the ‘Setup’ Category

How to fix SQL Patch Error: No valid sequence could be found for the set of updates.

Posted by blakhani on December 1, 2019


DISCLAIMER : THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Note: It is recommended to take backup of all the files before making any changes.

Recently we worked on a support case where we were having trouble installing SQL Server Patch. This was SQL Server 2016 SP2 and we were trying to install KB4524334 CU10 for SQL Server 2016 SP2. There was failure while upgrading PolyBase feature. (This can happen with other features also so same can be followed to fix them as well). The screenshot was something similar.

Let me start by explaining how do we troubleshoot installation/path failure issues. Whenever we troubleshoot SQL Server Setup/Patch related issue, we start looking at the log files to find exact error message which caused the failure. In case of patching, we first look at Summary.txt file which gives overall picture for all instances which were attempted to patch. Based on instance which had failure, we need to look at Summary file located under the instance name folder and dig further. Here is the article from online documentation:

View and Read SQL Server Setup Log Files

Lets go step by step in our scenario.

1. We looked at Summary_<MachineName>_<DateTimeStamp>.txt which is located under the folder having date-time stamp. I have highlighted important information which you need to review.

Overall summary:
  Final result:                  The patch installer has failed to update the following instance: MSSQLSERVER. To determine the reason for failure, review the log files.
  Exit code (Decimal):           -2068052368
  Start time:                    2019-11-26 11:57:40
  End time:                      2019-11-26 12:00:01
  Requested action:              Patch

Instance MSSQLSERVER overall summary:
  Final result:                  The patch installer has failed to update the shared features. To determine the reason for failure, review the log files.
  Exit code (Decimal):           -2068052368
  Start time:                    2019-11-26 11:58:49
  End time:                      2019-11-26 11:59:51
  Requested action:              Patch

2. We can see “Overall summary” and “Final result” which tells the instance which got failure, if any. In this case “MSSQLSERVER” which is a default instance. Below “Overall Summary” we can also see each instance overall summary.

3. Our failure was for instance MSSQLSERVER hence we need to go inside MSSQLSERVER folder and then look at Summary_<MachineName>_<DateTimeStamp>.txt file there. The information in this file would tell exact component which failed. Here are the various sections in that file and their meaning.

Overall summary:     
<This section shows Action requested (like Install, Patch, Repair, EditionUpgarde etc.) and overall outcome of the setup. This would also tell if reboot is needed>

Machine Properties:    
<Various Details about the machine like name, operating system, language etc.>

Product features discovered:   
<This section would show details about SQL features which are already installed on this machine> 

Package properties:    
<This section would show information about the media which we are using to install/patch, its version, patch level etc.>

User Input Settings:    
<This section would show action requested, Install, Patch, EditionUpgarde etc.>

Detailed results:     
<This section would show information about each features being installed and whether it was Passed or Failed. In case of Failure, it would also so information about how to move forward>

 

Other sections were not relevant in this troubleshooting so ignoring them.

We know the sections and let us use the information available

Overall summary:
  Final result:                  The patch installer has failed to update the shared features. To determine the reason for failure, review the log files.
  Exit code (Decimal):           -2068052368
  Start time:                    2019-11-26 11:58:49
  End time:                      2019-11-26 11:59:51
  Requested action:              Patch

Setup completed with required actions for features.
Troubleshooting information for those features:
  Next step for Polybase:        Use the following information to resolve the error, and then try the setup process again.

Detailed results:
  Feature:                       PolyBase Query Service for External Data
  Status:                        Failed: see logs for details
  Reason for failure:            An error occurred during the setup process of the feature.
  Next Step:                     Use the following information to resolve the error, and then try the setup process again.
  Component name:                SQL PolyBase
  Component error code:          1648
  Component log file:            C:\Program Files\Microsoft SQL Server\130\Setup Bootstrap\Log\20191126_115725\MSSQLSERVER\sql_polybase_core_inst_Cpu64_1.log
  Error description:             No valid sequence could be found for the set of updates.

  Feature:                       R Services (In-Database)
  Status:                        Passed

  Feature:                       Database Engine Services
  Status:                        Passed

  Feature:                       Integration Services
  Status:                        Passed

  Feature:                       Analysis Services
  Status:                        Passed

  Feature:                       SQL Browser
  Status:                        Passed

  Feature:                       SQL Writer
  Status:                        Passed

  Feature:                       LocalDB
  Status:                        Passed

  Feature:                       Setup Support Files
  Status:                        Passed

From above information, we can easily understand that Polybase component had failure and other components got installed (shown as Passed). The message also points us to log which should have more details. When I opened sql_polybase_core_inst_Cpu64_1.log . The last few lines before failures are shown below.

MSI (s) (BC:90) [11:59:39:817]: Opening existing patch ‘C:\Windows\Installer\39187852.msp’.
MSI (s) (BC:90) [11:59:39:818]: Note: 1: 2205 2:  3: MsiPatchSequence
MSI (s) (BC:90) [11:59:39:818]: Opening existing patch ‘C:\Windows\Installer\6419f1dc.msp’.
MSI (s) (BC:90) [11:59:39:820]: Opening existing patch ‘C:\Windows\Installer\10894c.msp‘.
MSI (s) (BC:90) [11:59:39:838]: File will have security applied from OpCode.
MSI (s) (BC:90) [11:59:42:428]: Original patch ==> G:\d43ad554dc7e18fa425c07eed0\x64\setup\sql_polybase_core_inst.msp
MSI (s) (BC:90) [11:59:42:428]: Patch we’re running from ==> C:\Windows\Installer\3d61881.msp
MSI (s) (BC:90) [11:59:42:429]: SOFTWARE RESTRICTION POLICY: Verifying patch –> ‘G:\d43ad554dc7e18fa425c07eed0\x64\setup\sql_polybase_core_inst.msp’ against software restriction policy
MSI (s) (BC:90) [11:59:42:429]: SOFTWARE RESTRICTION POLICY: G:\d43ad554dc7e18fa425c07eed0\x64\setup\sql_polybase_core_inst.msp has a digital signature
MSI (s) (BC:90) [11:59:44:784]: SOFTWARE RESTRICTION POLICY: G:\d43ad554dc7e18fa425c07eed0\x64\setup\sql_polybase_core_inst.msp is permitted to run at the ‘unrestricted’ authorization level.
MSI (s) (BC:90) [11:59:44:784]: SequencePatches starts. Product code: {0877B0AD-CF2A-4079-BDC7-E1EE287F6B9A}, Product version: 13.0.1601.5, Upgrade code: {3577537A-A081-4B6F-8CA3-43315ED52B32}, Product language 1033
MSI (s) (BC:90) [11:59:44:784]: Note: 1: 2205 2:  3: MsiPatchSequence
MSI (s) (BC:90) [11:59:44:784]: Note: 1: 2203 2: RTM.1 3: -2147287038
MSI (s) (BC:90) [11:59:44:784]: PATCH SEQUENCER ERROR: failed to open RTM.1 transform in {6A8DFAB4-23AC-4C79-B509-DF1CC39A58CD} patch! (1: 2203 2: RTM.1 3: -2147287038 )
MSI (s) (BC:90) [11:59:44:784]: SequencePatches returns error 1648.
MSI (s) (BC:90) [11:59:44:785]: Product: SQL Server 2016 SQL Polybase – Update ‘{F0B7DA4A-7ACB-424E-A44E-11F27090AABA}’ could not be installed. Error code 1648. Additional information is available in the log file C:\Program Files\Microsoft SQL Server\130\Setup Bootstrap\Log\20191126_115725\MSSQLSERVER\sql_polybase_core_inst_Cpu64_1.log.

MSI (s) (BC:90) [11:59:44:786]: Windows Installer installed an update. Product Name: SQL Server 2016 SQL Polybase. Product Version: 13.0.1601.5. Product Language: 1033. Manufacturer: Microsoft Corporation. Update Name: {F0B7DA4A-7ACB-424E-A44E-11F27090AABA}. Installation success or error status: 1648.

MSI (s) (BC:90) [11:59:44:786]: Note: 1: 1708
MSI (s) (BC:90) [11:59:44:786]: Product: SQL Server 2016 SQL Polybase — Installation failed.

MSI (s) (BC:90) [11:59:44:787]: Windows Installer installed the product. Product Name: SQL Server 2016 SQL Polybase. Product Version: 13.0.1601.5. Product Language: 1033. Manufacturer: Microsoft Corporation. Installation success or error status: 1648.

Now the solution of the issue. If you look closely at the log file, it is referring few msp files, highlighted in blue color (39187852.msp, 6419f1dc.msp, 10894c.msp)  . These files are cached version of sql_polybase_core_inst.msp files in C:\Windows\Installer folder. These files are for various previous patches applied on PolyBase feature. How would you find which MSP belongs to which patch i.e. which service pack, which CU, which KB? Fortunately there is a detailed KB available for this.

How to restore the missing Windows Installer cache files and resolve problems that occur during a SQL Server update

In the article go with “Procedure 1.b.: Use the FindSQLInstalls.vbs script” and run VBScript given. Once you run the script, open the output file and search for the msp files which are listed (highlighted by blue) in previous snippet. Here is are the relevant sections from VBScript output file. (Search for 39187852.msp)

Display Name:    Service Pack 2 for SQL Polybase (64-bit) (KB4052908)
KB Article URL:  http://support.microsoft.com/?kbid=4052908
Install Date:    20190129
  Uninstallable:   1
Patch Details:
  HKEY_CLASSES_ROOT\Installer\Patches\4BAFD8A6CA3297C45B90FDC13CA985DC
  PackageName:   sql_polybase_core_inst.msp
   Patch LastUsedSource: n;1;g:\c1d6c477712a2972547d\x64\setup\
  Installer Cache File Path:     C:\Windows\Installer\39187852.msp
    Per SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Patches\4BAFD8A6CA3297C45B90FDC13CA985DC\LocalPackage

   Package exists in the Installer cache, no actions needed.
   Package will update automatically if needed assuming that
   the LastUsedSource exists.

   Should you get errors about C:\Windows\Installer\39187852.msp or g:\c1d6c477712a2972547d\x64\setup\sql_polybase_core_inst.msp then you
   may need to manually copy missing files, if file exists replace the problem file,
   Copy and paste the following command line into an administrative command prompt.

    Copy "g:\c1d6c477712a2972547d\x64\setup\sql_polybase_core_inst.msp" C:\Windows\Installer\39187852.msp

It clearly tells this MSP is from “Service Pack 2 for SQL Polybase (64-bit) (KB4052908)”. Lets have look at one more msp output. (6419f1dc.msp)

Display Name:    Hotfix 5337 for SQL Polybase (64-bit) (KB4495256)
KB Article URL:  http://support.microsoft.com/?kbid=4495256
Install Date:    20190605
  Uninstallable:   1
Patch Details:
  HKEY_CLASSES_ROOT\Installer\Patches\8EE0896B83D2A1246AD903269C85495A
  PackageName:   sql_polybase_core_inst.msp
   Patch LastUsedSource: n;1;G:\5645cedfa7be15cb95b0aedb1d6d05\x64\setup\
  Installer Cache File Path:     C:\Windows\Installer\6419f1dc.msp
    Per SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Patches\8EE0896B83D2A1246AD903269C85495A\LocalPackage

   Package exists in the Installer cache, no actions needed.
   Package will update automatically if needed assuming that
   the LastUsedSource exists.

   Should you get errors about C:\Windows\Installer\6419f1dc.msp or G:\5645cedfa7be15cb95b0aedb1d6d05\x64\setup\sql_polybase_core_inst.msp then you
   may need to manually copy missing files, if file exists replace the problem file,
   Copy and paste the following command line into an administrative command prompt.

    Copy "G:\5645cedfa7be15cb95b0aedb1d6d05\x64\setup\sql_polybase_core_inst.msp" C:\Windows\Installer\6419f1dc.msp

It should be easy for you to identify that this one is from Hotfix 5337 for SQL Polybase (64-bit) (KB4495256)

Have a look at the file in C:\Windows\Installer folder and make a note of the size (39187852.msp, 6419f1dc.msp, 10894c.msp). Next download the KB which is mentioned in the “Display Name”. Once downloaded, extract in the path mentioned in last line, the copy command. Following above two examples, KB4052908 needs to be extracted in g:\c1d6c477712a2972547d and KB4495256 should be extracted in G:\5645cedfa7be15cb95b0aedb1d6d05. Note that this location is NOT fixed and you need to use the one in your script output. Now compare the files mentioned in last line (same copy command). Mostly you would find that at least one of the file would not be correct and that is the problem.

To fix the issue, we need to make sure that MSP file in C:\Windows\Installer is same as the one in the media.

Here is sql_polybase_core_inst_Cpu64_1.log file from another patch failure for SQL Server 2017. This one shows only one MSP instead of three which we have seen in previous logs. It all depends on which all patches have been installed previously. I would like you at analyze below file and then move further.

MSI (s) (D4:B4) [14:43:47:265]: Opening existing patch ‘C:\windows\Installer\5640be.msp‘.
MSI (s) (D4:B4) [14:43:47:265]: Note: 1: 2205 2:  3: MsiPatchSequence
MSI (s) (D4:B4) [14:43:47:265]: Note: 1: 1402 2: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer 3: 2
MSI (s) (D4:B4) [14:43:47:265]: File will have security applied from OpCode.
MSI (s) (D4:B4) [14:43:47:812]: Original patch ==> f:\05c89661f21d4215ddc41e36f60a\x64\setup\sql_polybase_core_inst.msp
MSI (s) (D4:B4) [14:43:47:812]: Patch we’re running from ==> C:\windows\Installer\611c45.msp
MSI (s) (D4:B4) [14:43:47:812]: SOFTWARE RESTRICTION POLICY: Verifying patch –> ‘f:\05c89661f21d4215ddc41e36f60a\x64\setup\sql_polybase_core_inst.msp’ against software restriction policy
MSI (s) (D4:B4) [14:43:47:812]: SOFTWARE RESTRICTION POLICY: f:\05c89661f21d4215ddc41e36f60a\x64\setup\sql_polybase_core_inst.msp has a digital signature
MSI (s) (D4:B4) [14:43:49:062]: SOFTWARE RESTRICTION POLICY: f:\05c89661f21d4215ddc41e36f60a\x64\setup\sql_polybase_core_inst.msp is permitted to run at the ‘unrestricted’ authorization level.
MSI (s) (D4:B4) [14:43:49:062]: SequencePatches starts. Product code: {41E37C92-1A68-4909-95A1-D9D59B0C0548}, Product version: 14.0.1000.169, Upgrade code: {3CCB3D90-D0AD-40F6-9C81-836CFE259EEE}, Product language 1033
MSI (s) (D4:B4) [14:43:49:062]: Note: 1: 2205 2:  3: MsiPatchSequence
MSI (s) (D4:B4) [14:43:49:062]: Note: 1: 2203 2: RTM.1 3: -2147287038
MSI (s) (D4:B4) [14:43:49:062]: PATCH SEQUENCER ERROR: failed to open RTM.1 transform in {76ACE427-ED4D-480E-BA64-8E09038A428B} patch! (1: 2203 2: RTM.1 3: -2147287038 )
MSI (s) (D4:B4) [14:43:49:062]: SequencePatches returns error 1648.
MSI (s) (D4:B4) [14:43:49:077]: Product: SQL Server 2017 SQL Polybase – Update ‘{533B2368-AC10-4078-A3AA-DA9F1B33E9FE}’ could not be installed. Error code 1648. Additional information is available in the log file C:\Program Files\Microsoft SQL Server\140\Setup Bootstrap\Log\20191129_143647\MSSQLSERVER\sql_polybase_core_inst_Cpu64_1.log.

MSI (s) (D4:B4) [14:43:49:077]: Windows Installer installed an update. Product Name: SQL Server 2017 SQL Polybase. Product Version: 14.0.1000.169. Product Language: 1033. Manufacturer: Microsoft Corporation. Update Name: {533B2368-AC10-4078-A3AA-DA9F1B33E9FE}. Installation success or error status: 1648.

MSI (s) (D4:B4) [14:43:49:077]: Note: 1: 1708
MSI (s) (D4:B4) [14:43:49:077]: Product: SQL Server 2017 SQL Polybase — Installation failed.

MSI (s) (D4:B4) [14:43:49:077]: Windows Installer installed the product. Product Name: SQL Server 2017 SQL Polybase. Product Version: 14.0.1000.169. Product Language: 1033. Manufacturer: Microsoft Corporation. Installation success or error status: 1648.

We were able to use VBScript to get the MSP from patch media and replaced it in C:\Windows\Installer. After that we ran patch again and it went fine.

As I have mentioned earlier, you need to be little careful while playing with the files. Always take a backup – Better safe than sorry!

  • Cheers,
  • Balmukund Lakhani
  • Twitter @blakhani
  • Author: SQL Server 2012 AlwaysOn – Paperback, Kindle
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    Posted in patch failure, Setup, SQL Server, Troubleshooting | Tagged: | 2 Comments »

    Solution – Unable to install SQL Server 2008 on Windows Server 2012 Server – Error – The service did not respond to the start or control request in a timely fashion

    Posted by blakhani on June 10, 2015


    Recently I was trying to do some test with old version of SQL and ran into interesting issue. I ran the setup of SQL Server 2008 RTM on Windows Server 2012. It failed with error

    The service did not respond to the start or control request in a timely fashion

    The error means that SQL Setup was unable to start the SQL Server service in middle of the installation. I had no choice but  to cancel the installation. Here are the messages logged in various setup logs. here is the snip from Summary.txt

    Overall summary:

      Final result:                  SQL Server installation failed. To continue, investigate the reason for the failure, correct the problem, uninstall SQL Server, and then rerun SQL Server Setup.

      Exit code (Decimal):           -595541211

      Exit facility code:            1152

      Exit error code:               49957

      Exit message:                  SQL Server installation failed. To continue, investigate the reason for the failure, correct the problem, uninstall SQL Server, and then rerun SQL Server Setup.

      Start time:                    2015-05-08 21:26:19

      End time:                      2015-05-08 21:37:05

      Requested action:              Install

      Log with failure:              C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20150508_212400\Detail.txt

    …

    …

    Detailed results:

      Feature:                       Database Engine Services

      Status:                        Failed: see logs for details

      MSI status:                    Passed

      Configuration status:          Failed: see details below

      Configuration error code:      0xDC80C325

      Configuration error description: The service did not respond to the start or control request in a timely fashion. 

      Configuration log:             C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20150508_212400\Detail.txt

    I love the error message in summary as it tells me what exactly need to be done. Investigate, correct the cause, uninstall SQL and re-run setup. Perfect! So let’s investigate. Detail.txt had nothing interesting than telling that I am not able to start SQL Service. Since SQL service was present after cancelling the setup, I tried to start manually but it was same error via services.msc. So I tried to start SQL Server executable via command prompt by running sqlserver.exe –c –sMSQLSERVER command and it gave me below popup message.

    Problem signature:

      Problem Event Name:         BEX64

      Application Name:           sqlservr.exe

      Application Version:        2009.100.1600.1

      Application Timestamp:      4bb6b40b

      Fault Module Name:          StackHash_120f

      Fault Module Version:       0.0.0.0

      Fault Module Timestamp:     00000000

      Exception Offset:           PCH_EF_FROM_ntdll+0x000000000009177A

      Exception Code:             c0000005

      Exception Data:             0000000000000008

      OS Version:                 6.3.9600.2.0.0.272.7

      Locale ID:         1033

      Additional Information 1:         120f

      Additional Information 2:         120feecb532e5330843bb85768dc5d8d

      Additional Information 3:         86ef

      Additional Information 4:         86ef44a294d70f6087e5d1fcc74465eb

     

    Read our privacy statement online:

      http://go.microsoft.com/fwlink/?linkid=280262

     

    If the online privacy statement is not available, please read our privacy statement offline:

      C:\Windows\system32\en-US\erofflps.txt

    The code highlighted above is Access Violation hex code. I did some more search and found below KB

    https://support.microsoft.com/en-us/kb/2681562 (How to use SQL Server in Windows 8, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2)

     

    So, now I know that my issue is that RTM version of SQL Server 2008 is not supported on Windows Server 2012 and I have to do slipstreaming of media so that SP2 is installed along with RTM.

    I Slipstreamed media using Peter’s blog http://blogs.msdn.com/b/petersad/archive/2011/07/13/how-to-slipstream-sql-server-2008-r2-and-a-sql-server-2008-r2-service-pack-1-sp1.aspx

    After making media ready, I uninstalled SQL, restarted machine and used the slipstream media. This time I was able to install SQL without any error.

    Hope this helps.

  • Cheers,
  • Balmukund Lakhani
  • Twitter @blakhani

    • Posted in Installation, Setup, SQL Server, SQL Server 2008 | Tagged: , , | 4 Comments »

    SQL Cluster Setup Error – System.Runtime.InteropServices.COMException (0x80070490): Element not found

    Posted by blakhani on May 19, 2015


    My job revolves around troubleshooting and fixing the broken thing. Here is one of the situation which I ran into recently and was unable to find solution on internet. It my responsibility to provide self-assist option to the SQL community so that they can find the problem and fix by themselves.

    I was trying to install SQL Server 2012 on a 2 nodes Windows cluster. When I tried installing it, it failed with error in subject line. At this first look it sounds like some COM+ error but as always, setup logs are my first place to find the errors. Here is the MSDN link which explains the various files created by setup

    https://msdn.microsoft.com/en-us/library/ms143702(v=sql.110).aspx (View and Read SQL Server Setup Log Files)

    The information which I saw in setup logs was pretty interesting. In particular, I looked into Detail.txt file which is the parent file of all MSI logs. (I have removed date and time for better reading)

    Error: Action "Microsoft.SqlServer.Configuration.SetupExtension.ValidateFeatureSettingsAction" threw an exception during execution.
    Microsoft.SqlServer.Setup.Chainer.Workflow.ActionExecutionException: Element not found. (Exception from HRESULT: 0x80070490) —> System.Runtime.InteropServices.COMException (0x80070490): Element not found. (Exception from HRESULT: 0x80070490)
       at Microsoft.SqlServer.Interop.MSClusterLib.ISClusResource.get_Disk()
       at Microsoft.SqlServer.Configuration.Cluster.ClusterPhysicalDisk.get_Partitions()
       at Microsoft.SqlServer.Configuration.ClusterConfiguration.ClusterDiskPublicConfigObject.IsPathOnSharedDisk(String path)
       at Microsoft.SqlServer.Configuration.SetupExtension.SlpInputSettings.ValidateNotOnSharedDisk(ValidationState vs, String directoryName, String bindingKey, String errorMessage)
       at Microsoft.SqlServer.Configuration.SetupExtension.SlpInputSettings.Validate_InstallSharedDir(ValidationState vs)
       at Microsoft.SqlServer.Configuration.SetupExtension.SlpInputSettings.ValidateSettings()
       at Microsoft.SqlServer.Configuration.SetupExtension.ValidateFeatureSettingsAction.ExecuteAction(String actionId)
       at Microsoft.SqlServer.Chainer.Infrastructure.Action.Execute(String actionId, TextWriter errorStream)
       at Microsoft.SqlServer.Setup.Chainer.Workflow.ActionInvocation.ExecuteActionHelper(TextWriter statusStream, ISequencedAction actionToRun)

     

    The stack goes from bottom to Top. If we read the function calls made, anyone can conclude that there is something happening with cluster disks. That’s a good hint. So, I went back to failover cluster manager and looked into Disks under “Storage”. There was a disk which was in failed state. I was not able to bring this online and that’s THE problem! SQL Setup would enumerate the disks to find eligible disks which can be used and it’s not able to find details about that disk. Here was the error when I attempted to bring it online.

    The resource ‘Cluster Disk 1’ did not come online.
    The desired state change for ‘Cluster Disk 1’ did not occur before the timeout expired.

    I realized that I have played with iSCSI and messed up the disk which was presented.

    Solution: Delete the disks which are not able to come online under “Storage > Disks” or “Available Storage” in failover cluster manager interface.

    Hope this helps.

  • Cheers,
  • Balmukund Lakhani
  • Twitter @blakhani
  • Author: SQL Server 2012 AlwaysOn – Paperback, Kindle

    • Posted in Cluster, Installation, Setup, SQL Server 2012, SQL Server 2014 | Tagged: , , , , | 3 Comments »