Using a newer db version than what a COTS application supports

This is more of a general question ...
My manager today asked me what I thought about moving an application's back-end from SQL Server into Oracle. He was concerned because in SQL Server, they were repeatedly constrained in upgrading the database to newer versions, because the vendor was slow in approving newer versions of SQL Server. He didn't want to impact our plans to upgrade Oracle (95% of our data) because one application (5% of our data) was in conflict.
So it got me to thinking, has anyone ever had a problem using a newer version of the database, than what a vendor claims to support? I guess I'm thinking that as long as the software has a compatible client, then a newer database should be a safe gamble? Am I being naive? It just seems like with Oracle, newer versions bring in newer features, but rarely remove anything.
--=Chuck

I wouldn't run a version of Oracle that the vendor didn't support. While it's true that Oracle isn't likely to remove a particular feature, adding a new feature can cause just as many problems-- you may find that query plans change, for example, or you may find bugs where the COTS vendor assumes that SQL behaves one way because it happens to do that in one version of Oracle but the behavior changes in a future version. Plenty of COTS software assumed that GROUP BY did an implicit ORDER BY because Oracle happened to implement GROUP BY by doing a sort. Until 10g, I believe, when hash group by's were introduced, and suddenly things that were supposed to be sorted weren't sorted anymore.
Normally, each COTS application would have its own separate database. That allows you to upgrade and patch other Oracle instances without worrying about whether the COTS vendor supports it. When the COTS vendor validates their application against the new version of the database, you then upgrade the COTS Oracle instance. So it normally doesn't affect your upgrade schedules for everything else in the world if one application wants to use an older version of Oracle.
Justin

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