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Optimize Parameterized Row Filters

This topic describes how to optimize parameterized row filters in SQL Server 2012 by using SQL Server Management Studio or Transact-SQL.

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Recommendations

  • When you use parameterized filters, you can control how the filters are processed by merge replication by specifying either the use partition groups option or the keep partition changes option when you create a publication. These options improve the synchronization performance for publications with filtered articles by storing additional metadata in the publication database. You can control how the data is shared among Subscribers by setting partition options when you create an article. For more information about these requirements, see Parameterized Row Filters.

    With SQL Server CompactSQL Server Compact subscribers, keep_partition_changes must be set to true to ensure that deletes are correctly propagated. When set to false, the subscriber might have more rows than expected.

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The following settings can be used to optimize parameterized row filters:

Partition Options

Set this option on the Properties page of the Article Properties - <Article> dialog box, or in the Add Filter dialog box. Both dialog boxes are available in the New Publication Wizard and the Publication Properties - <Publication> dialog box. The Article Properties - <Article> dialog box allows you to specify additional values for this option that are not available in the Add Filter dialog box.

Precompute Partitions

This option is set to True by default if the articles in your publication adhere to a set of requirements. For more information about these requirements, see Optimize Parameterized Filter Performance with Precomputed Partitions. Modify this option on the Subscription Options page of the Publication Properties - <Publication> dialog box.

Optimize Synchronization

This option should be set to True only if Precompute Partitions is set to False. Set this option on the Subscription Options page of the Publication Properties - <Publication> dialog box.

For more information about using the New Publication Wizard and accessing the Publication Properties - <Publication> dialog box, see Create a Publication and View and Modify Publication Properties.

To set Partition options in the Add Filter or Edit Filter dialog box

  1. On the Filter Table Rows page of the New Publication Wizard or the Filter Rows page of the Publication Properties - <Publication> dialog box, click Add, and then click Add Filter.

  2. Create a parameterized filter. For more information, see Define and Modify a Parameterized Row Filter for a Merge Article.

  3. Select the option that matches how data will be shared among Subscribers:

    • A row from this table will go to multiple subscriptions

    • A row from this table will go to only one subscription

    If you select A row from this table will go to only one subscription, merge replication can optimize performance by storing and processing less metadata. However, you must ensure that the data is partitioned in such a way that a row cannot be replicated to more than one Subscriber. For more information, see the section "Setting 'partition options'" in the topic Parameterized Row Filters.

  4. Click OK.

  5. If you are in the Publication Properties - <Publication> dialog box, click OK to save and close the dialog box.

To set Partition Options in the Article Properties - <Article> dialog box

  1. On the Articles page of the New Publication Wizard or the Publication Properties - <Publication> dialog box, select a table, and then click Article Properties.

  2. Click Set Properties of Highlighted Table Article or Set Properties of All Table Articles.

  3. In the Destination Object section of the Properties tab of the Article Properties - <Article> dialog box, specify one of the following values for Partition Options:

    • Overlapping

    • Overlapping, disallow out-of-partition data changes

    • Nonoverlapping, single subscription

    • Nonoverlapping, shared between subscriptions

    For more information about these options and how they relate to the options available in the Add Filter and Edit Filter dialog boxes, see the "Setting 'partition options'" section of Parameterized Row Filters.

  4. Click OK.

  5. If you are in the Publication Properties - <Publication> dialog box, click OK to save and close the dialog box.

To set Precompute Partitions

  1. On the Subscription Options page of the Publication Properties - <Publication> dialog box, select a value for the Precompute Partitions option. The property is read-only if:

    • The publication does not meet the requirements for precomputed partitions.

    • A snapshot has not yet been generated for the publication. In this case, the option displays a value of Set automatically when a snapshot is created.

  2. Click OK.

To set Optimize Synchronization

  1. On the Subscription Options page of the Publication Properties - <Publication> dialog box, select a value of True for the Optimize Synchronization option.

  2. Click OK.

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For definitions of the filtering options for @keep_partition_changes and @use_partition_groups, see sp_addmergepublication.

To specify merge filter optimizations when creating a new publication

  1. At the Publisher on the publication database, execute sp_addmergepublication. Specify @publication and a value of true for one the following parameters:

  2. Add a snapshot job for the publication. For more information see Create a Publication.

  3. At the Publisher on the publication database, execute sp_addmergearticle, specifying the following parameters:

    • @publication - the name of the publication from step 1.

    • @article - a name for the article

    • @source_object - the database object being published.

    • @subset_filterclause - the optional parameterized filter clause used to horizontally filter the article.

    • @partition_options - the partition options for the filtered article.

  4. Repeat step 3 for each article in the publication.

  5. (Optional) At the Publisher on the publication database, execute sp_addmergefilter to define a join filter between two articles. For more information, see Define and Modify a Join Filter Between Merge Articles.

To view and modify merge filter behaviors for an existing publication

  1. (Optional) At the Publisher on the publication database, execute sp_helpmergepublication, specifying @publication. Note the value of keep_partition_changes and use_partition_groups in the result set.

  2. (Optional) At the Publisher on the publication database, execute sp_changemergepublication. Specify a value of use_partition_groups for @property and either true or false for @value.

  3. (Optional) At the Publisher on the publication database, execute sp_changemergepublication. Specify a value of keep_partition_changes for @property and either true or false for @value.

    Note Note

    When enabling keep_partition_changes, you must first disable use_partition_groups and specify a value of 1 for @force_reinit_subscription.

  4. (Optional) At the Publisher on the publication database, execute sp_changemergearticle. Specify a value of partition_options for @property and the appropriate value for @value. See sp_addmergearticle for definitions of these filtering options.

  5. (Optional) Start the Snapshot Agent to regenerate the snapshot if necessary. For information about which changes require a new snapshot to be generated, see Change Publication and Article Properties.

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