SQL Server Q&A

Symptoms
A query that contains a large number of predicates that are AND-ed together may cause a stack overflow exception. Several thousand conditions are typically required for this problem to occur, and you may reach a limit on the maximum batch size of your query tool before encountering this situation. Many query tools limit batches to 128 KB, whereas SQL Server 7.0 now accepts a batch size as large as (65536 * network packet size).
Resolution
During optimization, memory for selectivity calculation was being allocated from the stack. This allocation depends on the number of nodes being AND-ed together and can result in a stack overflow.

Symptoms
If a query that returns many bit columns is run as a parallel query and the row size passed through one of the Parallelism physical operators in the plan exceeds approximately 8 KB in size, a handled access violation may occur.
Resolution
A Parallelism physical operator is limited to handling a row size greater than approximately 8 KB in size, and normally such plans are excluded from being run as a parallel plan. Due to a bug in the calculation of the row size when handling bit columns, the query is incorrectly allowed to run in parallel but overflows a buffer allocated for transferring the data between threads.