havetriggers defined to maintain the
subscription-list
column.
❖Tocreate a subscription view
1. Design a query that uses a subquery to select the proper rows for a
subscriptionfrom a table.
Forexample, continuing the example from the preceding sections, the
followingquery selects the rows of the Contact table for a user
subscribedby rep_key value rep5:
SELECT *
FROM Contact
WHERE ’rep5’ = (SELECT rep_key
FROM Customer
WHERE cust_key = Contact.cust_key )
2. Create a view that contains this subquery. For example:
CREATE VIEW Contact_sub_view AS
SELECT *
FROM dbo.Contact
WHERE ’repxx’ = ( SELECT rep_key
FROM dbo.Customer
WHERE cust_key = dbo.Contact.cust_key )
Inthis view definition, it does not matter what value you use on the
left-handside of the WHERE clause (repxx in the example above). The
replicationtools use the subquery for extraction and synchronization
only.Rows for which the SUBSCRIBE BY value is equal to the
subqueryresult set are extracted or synchronized.
3. Give the name of the view as a parameter to sp_add_article or
sp_modify_article:
exec sp_add_remote_table ’Contact’
go
exec sp_add_article SalesRepData,
’Contact’,
NULL,
’subscription_list’,
’Contact_sub_view’
Thesubscription_list column is used for log scanning and the subquery is
usedfor extraction and synchronization.
☞Formore information, see “Tuning extraction performance for shared
rows”on page 162,“sp_add_article procedure” on page 381, and
“sp_modify_articleprocedure” on page 398.
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