SQL Server 2012 : Consolidating Data Capture with SQLdiag - Getting Friendly with SQLdiag (part 2) - Using SQLdiag as a Service

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Using SQLdiag as a Service

The third way you can collect data using SQLdiag is with a Windows service. You can use the /R parameter to register the utility as a service, and /U to unregister the tool as a service. You can use the /A switch to register SQLdiag as a service with a unique name. Figure 2 shows the properties of the SQLdiag utility registered as a service. The following command registers SQLdiag as a service with the name DIAG1:



As you can see, the SQLdiag service registration appends DIAG$ to the service name when the /A parameter is used to provide the application name. If you choose to only use the /R switch, then the service is named SQLDIAG as shown in Figure 3.



Note that service registration is done using the Log On As account as Local System. The majority of environments in which you will be using SQLdiag as a service will likely not have SQL Server sysadmin privileges granted to the Local System account. Therefore, after registering the utility as a service, you will need to change the service account to an account that has Administrator rights on the Windows machine and sysadmin privileges on the SQL Server instance(s) to which the service will connect.

WARNING If you run the service using a user account that is not part of the Windows Administrator group or the sysadmin role of SQL Server without the /G switch, you will get the following message in the Windows Application Event Log:
Warning: User SYSTEM is not a member of the sysadmin role on <SQL Server instance name>. Diagnostics for <SQL Server instance name> will not be collected

The next decision you need to make is which parameters you want to specify for the service. While registering the service, you can provide parameters as appropriate. In the following example, SQLdiag is being registered as a service:

'C:\Program Files\Microsoft SQL Server\110\Tools\Binn\sqldiag.exe' /R /I 

A successful service registration reports the message “SQLDIAG Service installed. Exiting.” Note that in the above command, we needed to specify the path of the configuration file and the output folder, as well as to ensure that the right set of configuration options are used and the diagnostic data collected is captured in the correct folder.

WARNING The aforementioned success message is reported if you have multiple versions of SQLdiag available on the machine even if the SQL Server 2012 SQLdiag was not used for the service registration. This happens because your environment path variable points to the path of an older version of SQLdiag from another SQL Server 2005, 2008, or 2008 R2 installation, before the SQL Server 2012 path was added to the environment variable. Once you start the SQLdiag service, the following error will be reported in the SQLdiag log as well as in the Windows Application Event Log:
SQLDIAG . Function result: 87. Message: The parameter is incorrect. 
SQLDIAG Invalid SQL Server version specified. SQL Server version
11 is not supported by this version of the collector

The above message signifies that an older version of SQLdiag was used to connect to a SQL Server 2012 instance. When you start the SQLdiag service, it uses the parameters specified during service registration to collect the required data based on information present in the configuration file. You can view events reported by the SQLdiag service by looking at the Windows Application Event Log, shown in Figure 4.



Configuring and Running SQLdiag on a Failover Cluster

When configuring a data collection package for a SQL Server failover cluster instance with Diag Manager, you need to remember a few salient points:

  • Specify the SQL virtual server name as Machine Name.
  • Specify the SQL Server instance name in the Instance Name text box. For a default failover cluster instance, enter MSSQLSERVER.
  • Once you have the package configured, it is a best practice to run the SQLdiag data collection utility from the node that is the current owner of the SQL Server resource.

When running SQLdiag in the default configuration on a multi-instance failover cluster, the command window will show numerous errors in red. This is because the default configuration file, SQLDIAG.XML, has not been changed to collect data from a specific failover cluster instance. SQLdiag automatically detects the cluster and gathers logs and configuration information for every virtual server and instance. Errors are displayed in the command window because SQLdiag attempts to connect to each instance at every virtual server, resulting in several failures.

In this case, either configure the SQLDiag.XML file with the required target’s virtual server name or ignore these errors. If any errors are displayed, they can be safely ignored. Likewise, the log file (##SQLDIAG.LOG) is usually easier to read and interpret to identify errors that can be safely ignored. A few of the ignorable messages actually have the text “you can usually safely ignore this” enclosed in parentheses.

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