大型SQL事务:在PostgreSQL上耗尽内存，但在SQL服务器上工作

I have decided to move my C# daemon application (using dotConnect as ADO.NET provider) from SQL Server 2008 R2 to PostgreSQL 9.0.4 x64 (on Windows Server 2008 R2). Therefore I slightly modified all queries to match PostgreSQL syntax and... got stuck on behavior which never happened with the same queries on SQL Server (not even on lowly Express edition).I have decided to move my C# daemon application