Michael, > Well, you don't have to spend *quite* that much to get a decent storage > array. :)
Yes, I'm just pointing out that it's only the extreme cases which are clear-cut. Middle cases are a lot harder to define. For example, we've found that on DBT2 running of a 14-drive JBOD, seperating off WAL boosts performance about 8% to 14%. On DBT3 (DSS) seperate WAL (and seperate tablespaces) helps considerably during data load,but not otherwise. So it all depends. > That's a different creature from > a data mining app that might really benefit from having additional > spindles to accelerate read performance from indices much larger than > RAM. Yes, although the data mining app benefits from the special xlog disk during ETL. So it's a tradeoff. > At any rate, this just underscores the need for testing a > particular workload on particular hardware Yes, absolutely. -- --Josh Josh Berkus Aglio Database Solutions San Francisco ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
