>>>>> "CB" == Christopher Browne <[EMAIL PROTECTED]> writes:
CB> futile discussions ask for it. Notably, on an SMP system, it CB> would be a neat idea for complex queries involving joins to CB> split themselves so that different parts run in separate CB> threads. You don't really need threads for this. All you need is to have multiple backends and use queues to exchange tuples at specific points. This is much like the Exchange operator in Volcano. CB> The other Way, Way Cool part would be for queries that are CB> scanning big tables to split the scans into unions of partial CB> scans, so that on an 8 CPU box you'd take the "Big 4GB Table" CB> and have 8 threads simultaneously scanning different parts of CB> it. (And making ARC all the more important :-).) Again this can be done without threads .. you just need inter-process communication. (BTW, there is at least one commercial system that follows exactly this model). -- Pip-pip Sailesh http://www.cs.berkeley.edu/~sailesh ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster