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Share point 2010 : Managing Data Connections (part 4) - Modifying BDC Objects, Using External System Throttling

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11/9/2012 3:53:42 PM

7. Modifying BDC Objects

After the BDC Model is imported, you can change the following values, using the Central Administration website.

To modify one of the objects—BDC Models, external systems, or ECTs—follow these steps.

  1. Open a browser and go to the SharePoint Central Administration website.

  2. Under Application Management, click Manage Service Applications.

  3. In the View group on the Edit tab of the Service Application Information page, select BDC Models, External Systems, or External Content Types, as shown in Figure 18-19.

  4. From the drop-down menu, select the view options. For example, if you have chosen to display all external systems, then you can view all ECTs associated with those external systems, and then you can choose to view a specific ECT or add an action to an ECT, as shown in Figure 15.

Figure 15. Viewing an external content type


For database and Web Services external systems, you can modify the property settings by selecting settings from the drop-down menu. For database external systems, the property settings you can modify include authentication mode, server name, database name, and secure store target application ID, as shown in Figure 16.

Figure 16. Modifying database property settings


For a Web service, you can modify the authentication mode, Web service URL, Web service proxy timeout, and SSS information.

To delete one or more BDC Model, external system, or ECT, complete the following steps.

  1. Open a browser and go to the SharePoint Central Administration website.

  2. Under Application Management, click Manage Service Applications.

  3. In the View group on the Edit tab of the Service Application Information page, select BDC Models, External Systems, or External Content Types, as shown earlier in Figure 18-7.

  4. Select the check box for each model, external system, or ECT you want to delete and then in the BDC Models group on the Edit tab of the Ribbon, click Delete.

  5. When you are presented with an informational message dialog box warning you that this operation cannot be undone, click OK.


Note:

When you delete a BDC Model, all external content types and external data sources that are contained in the Model and that are not also contained in another model are deleted along with the BDC Model.


8. Using External System Throttling

BCS throttling is enabled by default to prevent Denial of Service attacks. You are most likely to see the effect of this feature if you created no limit filter on the BDC Model and the attempt by the BCS runtime to retrieve data from the external system is taking too long. Each BCS application can have a number of throttle configurations, and each configuration can be tuned to a throttle type and/or scope. Following are the five throttle types.

  • None No throttle type specified

  • Items The number of ECT instances returned, such as the number of customers or employees

  • Size The amount of data retrieved by the BDC runtime in bytes

  • Connections The number of open connections to a database, Web service, or .NET assembly

  • Timeout The time until an open connection is terminated, in milliseconds

The throttle scopes refer to the external system connection type, where the Global scope includes all connector types, such as database, Web service, WCF, and .NET Assembly connectors, except for custom connectors. The other scopes are Database, WebService, WCF, and Custom. Not all combinations of throttle types and scopes exist when a BCS application is first created. The rules that exist are

  • Global scope, Throttle type Connections

  • Database scope, Throttle type Items, and Timeout

  • WebService scope, Throttle type Size

  • WCF scope, Throttle type Size, and Timeout

You can retrieve and amend the throttling rules by using the Business Data Windows PowerShell cmdlets, as shown in the following examples, where the variable BCSName is the name of your BCS application.

$bcsproxy = Get-SPServiceApplicationProxy | where {$_.displayname -eq $BCSname};

					  

To display the throttling configuration for a BCS application you would use the following SharePoint cmdlet, where the output is shown.

Get-SPBusinessDataCatalogThrottleConfig -ServiceApplication $bcsproxy `
   -Scope Global -ThrottleType Connections;

Scope        : Global
ThrottleType : Connections
Enforced     : True
Default      : 200
Max          : 500

The output displays five properties. The three properties that you can amend are

  • Enforced, which defines if the rule is enabled

  • Default, which effects External Lists and custom Web Parts, although custom Web Parts can override this value and therefore can present more data than External Lists

  • Max, which is the limit used when custom Web Parts override the value in the Default property

To disable a throttling rule, use the following command.

Get-SPBusinessDataCatalogThrottleConfig -ServiceApplication $bcsproxy `
   -Scope Global -ThrottleType Connections | Set-SPBusinessDataCatalogThrottleConfig `
   -Enforced:$False;

					  

To modify a throttle rule, use the following command.

$dbrule = Get-SPBusinessDataCatalogThrottleConfig -ServiceApplication $bcsproxy `
   -Scope Database -ThrottleType Items;
$dbrule | Set-SPBusinessDataCatalogThrottleConfig -Maximum 2000000 -Default 5000;					  
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