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Figure 12-17. Everything looks pretty good for my package. Obviously, some packages will show problems against the performance counters specified. Using the information in Tables 12-2 and 12-3 against each of the counter types, you can highlight the cause of a particular issue, which gives you more information with which to investigate the problem. Having identified that there is a performance issue with a particular aspect of the database server, it s time to drill down yet further. If the issue is query related that is, a long-running query or an index-related problem using SQL Profiler to see the executing query causing the problem is the next step. If, however, the Perfmon results indicate a particularly SSIS-related issue, such as buffer usage, you can go straight to looking at some fixes and optimizations that relate specifically to SSIS.

shouldn t drop endpoints that the sample did not create. However, you could also search endpoints on your server using the type of endpoint in the endpoints catalog view. The following code shows how the endpoints are dropped and created for the principal. Since the mirror and witness code is very similar, we do not list it here. 'Create the endpoints. Start on the principal

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Most of the new classes that you use to build SQL assemblies reside in the Microsoft.SqlServer. Server namespace. These classes are used together with the ADO.NET provider for SQL Server (in the System.Data.SqlClient namespace) to access SQL Server data from within a SQL assembly. Together these are sometimes referred to as the in-process provider, although Microsoft seems largely to have abolished this term since the provider used for SQL assemblies was merged with the SqlClient provider. Apart from a couple of extensions to provide extra functionality, the chief difference between accessing SQL Server data from within a SQL assembly and from outside the database is in the way the connection is made.

'See if the endpoint already exists and if so, drop it 'since we can only have one mirroring endpoint per server strSQL = "SELECT name from sys.endpoints WHERE name = & _ 'MirroringPrincipalSampleEndPoint'" Dim strReturnValue As String = & _ CStr(ExecuteScalar(strConnectionStringPrincipal, strSQL)) If strReturnValue = "MirroringPrincipalSampleEndPoint" Then 'It exists, drop it strSQL = "DROP ENDPOINT MirroringPrincipalSampleEndPoint" boolError = ExecuteNonQuery(strConnectionStringPrincipal, & _ strSQL) If (boolError) Then MsgBox("Error dropping endpoint. Exiting setup.") SetCursorBack() Exit Sub End If End If

How much do I love SQL Profiler It s useful in so many ways, not least for spotting poorly performing SQL statements being fired at the database engine. You re probably already familiar with this tool, so I m going to illustrate how to configure it just to capture the events we are looking for.

Dim strPrincipalPort As String = & _ RetrievePortNumber(txtPrincipalEndPoint.Text) strSQL = "CREATE ENDPOINT [MirroringPrincipalSampleEndPoint] " & _ "STATE = STARTED" & _ " AS TCP (LISTENER_PORT = " & strPrincipalPort & _ ", LISTENER_IP = ALL, RESTRICT_IP=NONE)" & _ " FOR DATABASE_MIRRORING (ROLE = PARTNER," & _ " ENCRYPTION = DISABLED)" 'Create the endpoint boolError = ExecuteNonQuery(strConnectionStringPrincipal, strSQL) If (boolError) Then MsgBox("Error creating endpoint. Exiting setup.") SetCursorBack() Exit Sub Else MsgBox("Success! Created endpoint on Principal.") End If After creating the necessary endpoints, you next need to set your partners. You need to start with the mirror and tell the mirror who its principal partner is. Then you do the same with the principal. If a witness is used, you must set the witness as well on the principal server. The following code shows these three steps:

SQL Server Profiler is installed as part of SQL Server 2005. To open it, look in the Performance Tools folder under Start/Programs/SQL Server 2005. You will be presented with the main Profiler screen. Clicking File New Trace or the first icon on the toolbar will, after you select the database connection, present a dialog that looks a lot like Figure 12-18.

'Alter the mirror database to set the partner strSQL = "ALTER DATABASE " & strDatabaseName & _ " SET PARTNER = '" & txtPrincipalEndPoint.Text & "'" boolError = ExecuteNonQuery(strConnectionStringMirror, strSQL) If (boolError) Then MsgBox("Error setting partner on the Mirror. Exiting setup.") SetCursorBack() Exit Sub Else MsgBox("Success! Set partner on the mirror.") End If

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