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SQL Server Distributed Query  - what is the limit to how many different db's can be accessed in one query.

Posted on 2004-03-23
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Using a distributed, also called heterogeneous query with SQL Server 2000, what is the maximum number of different databases that can be referenced in a single query?     SQL Server 2000 supports  2^16-1 - 32767 databases in a named instance.    Again, the question is,  in a distributed query, such as :

SELECT s1.income, s2.contractlength  from  server1.database.owner.table s1, server2.database32.owner.table s2

how many different db's can be referenced in one query, is it indeed up to 32767 ? Or, can you cross query across 5 instances, including 150,000 references to db+table in the query.

Granted, 150,000 databases may seem absurd, however, I am wondering what the maxium is, whether it is 16 different databases, or even 32,767.

Tim Miltz

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danblake earned 250 total points
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It all becomes a lot lower:
Tables per SELECT statement 256...

So you can only reference a maximum of 256 different objects in a single query. (from linked servers/views/tables)
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