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SqlDependency performance

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Hi All,

I'm using SqlDependency (sql server 2008 r2) to get notification when data in some tables changes. The query notification is for cache invalidation.

There are three large tables and I want to get changes on a small subset of these tables. These three tables are changing frequently, but the subset is not changing frequently. I have a question about the performance impact.

How does the query notification track changes? Does it effect every query againsts these three tables ( not only for the subset)?

Performance is important in our system. If the sql dependency impacts db performance, we need to find another approach.

Thanks,

William





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