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Posted by Erland Sommarskog on 10/10/61 11:29
helmut woess (hw@iis.at) writes:
> (managed by triggers) but can be pinned into memory (DBCC PINTABLE() -
> maybe a silly idea, only brainstorming).
Yes, DBCC PINTABLE was really a silly idea of Microsoft/Sybase. (Don't
really know who came up with it.) So silly, that in fact in SQL 2005, the
command DBCC PINTABLE is a no-op that performs nothing.
If a table is referenced often enough, it will be in cache anyway, so
PINTABLE has no effect. But if you pin a large table of which only portions
are referenced with some frequency, this means that you are wasting memory
that could have been used for other table, and thus degrade performance.
The only point I can see with PINTABLE is that you have table that you
query so rarely, that it will fall out of the cache. But when you need to
query it, you need the answers snap.
--
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se
Books Online for SQL Server SP3 at
http://www.microsoft.com/sql/techinfo/productdoc/2000/books.asp
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