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In SQL Server 2000 publications, we sometimes use pre-snapshot and post-snapshot scripts. The pre-snapshot scripts are T-SQL scripts that run before the snapshot files are applied, whereas the post-snapshot scripts apply once the snapshot has completed. Their use is often to overcome DRI (declarative referential integrity) issues on the subscriber. Remember that the initialization process starts by dropping tables on the subscriber. If all the tables on the subscriber originate from one publication, this is not an issue, but if there is more than one publication involved, we might have a scenario where the dropping of tables at the subscriber during initialization would be invalid because of relationships between articles originating from different publications. There might also be other tables on the subscriber that are related to replicated articles and that are not themselves part of any publication. Either way, we find the same DRI problem when initialization tries to drop the subscriber s table. In such cases, the pre-snapshot and post-snapshot scripts are needed a pre-snapshot script would drop the foreign keys to allow the tables to be dropped, and a post-snapshot script would then add the foreign keys back in. Such scripts are not difficult to write, but each needs to be manually created and maintained, causing (another!) maintenance headache for the DBA. In SQL Server 2005 there is a new, automatic way of achieving this on initialization at the subscriber. Initially, there is a call to the sys.sp_MSdropfkreferencingarticle

tell the application "Finder" repeat if (count of Finder windows) is not greater than 1 then exit repeat close the back Finder window end repeat end tell

system stored procedure, which saves the relevant DRI information to the following three metadata tables: dbo.MSsavedforeignkeys dbo.MSsavedforeignkeycolumns dbo.MSsavedforeignkeyextendedproperties Once the information is safely hived away, the foreign keys are dropped. To re-add the foreign keys, the Distribution Agent calls the new sp_MSrestoresavedforeignkeys system stored procedure once the snapshot has been applied. Note that all this happens automatically and requires no manual scripts to be created. Take a look at your existing pre-snapshot and post-snapshot scripts. If they deal with the maintenance of foreign keys, there s a good chance they are doing work that is already done by default, in which case you ll be able to drop the scripts entirely and remove the maintenance issue.

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In SQL Server 2005 merge replication, we can now mark articles as download-only, meaning that changes to the table are only allowed at the publisher and not at the subscriber. Previously, in SQL Server 2000, we would use the -EXCHANGETYPE value to set the direction of merge replication changes. This was implemented by manually editing the Merge Agent s job step and adding -EXCHANGETYPE 1|2|3 as text. When using SQL Server 2000, entering a value of -EXCHANGETYPE 2 means that changes to a replicated article at the subscriber are not prohibited, are recorded in the merge metadata tables via merge triggers, and are subsequently filtered out when the Merge Agent synchronizes. This means there may be a huge amount of unnecessary metadata being recorded, which slows down both the data changes made to the table and the subsequent synchronization process. This -EXCHANGETYPE setting is not reflected directly in the GUI and is hidden away in the text of the Merge Agent s job. Despite being a maintenance headache and causing an unnecessary slowing down of synchronization, it was the only way of achieving this end, and judging by the newsgroups, its use was commonplace. In SQL Server 2005, when adding an article, there is an option to define the subscriber_upload_options either using the article properties screen in the GUI or in code, like this:

Here s how this works:

This parameter defines restrictions on updates made at a subscriber. The parameter value of 1 is described as download only, but allow subscriber changes and seems equivalent to the -EXCHANGETYPE = 2 setting mentioned previously, but in the SQL Server 2005 case there are no triggers at all on the subscriber table. Another distinction is that this setting is made at the more granular article level rather than set for the entire publication. This means that although the -EXCHANGETYPE and sp_addmergearticle methods are logically equivalent, the implementation has become

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