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>From: Joe Pluta [mailto:joepluta@xxxxxxxxxxxxxxxxx] >Anyway, as you have alluded to, I'm more than likely >arguing way over my head. No offense meant, hope none was taken. I too am at the edge of my knowledge-base here. As you saym this is ndeed a good place to move on (or at least let the IBMers continue the fight -- I'd LOVE to see that thread. <G>) -Walden PS. Care to discuss Java vs. .NET? <DUCKS> ------------ Walden H Leverich III President Tech Software (516) 627-3800 x11 (208) 692-3308 eFax WaldenL@xxxxxxxxxxxxxxx http://www.TechSoftInc.com Quiquid latine dictum sit altum viditur. (Whatever is said in Latin seems profound.) -----Original Message----- From: Joe Pluta [mailto:joepluta@xxxxxxxxxxxxxxxxx] Sent: Wednesday, April 23, 2003 5:48 PM To: Midrange Systems Technical Discussion Subject: RE: Where is IBM? > From: Walden H. Leverich III > > Now we're getting into a discussion of query optimizer design. I'm > sure we can agree that _both_ Microsoft and IBM have experts that > are _MUCH_ more versed in how this works than you or I. Hah! You take much for granted, oh Great MicroChief, when you assume that we can agree! <grin> Seriously, you're of course right on this. > However, I would expect that both systems evaluate the where clause, > open the index, lookup the keyvalue in the index, get the offset > into the dataspace and then get the row from that offset. Simple > enough. That works fine when you have an index, but not so well when you don't. And that's what the address space issue is all about - creating queries. You might want to re-read those two links. > Single-Level store or not, a database is just a byte stream. Ugh. Only in your world. In my world, a database is contiguous blocks of fixed-length records stored physically, with indices over those record built logically. You don't create an EVI over a byte stream. Now, there are exceptions, including VARCHAR and BLOB/CLOB, but those are exceptions rather than the rule (although I really like VARCHAR for certain things!). Anyway, as you have alluded to, I'm more than likely arguing way over my head. The database deities are undoubtedly chortling as they read my diatribes, so this is probably a reasonable place to admit ignorance and move on <smile>. Joe _______________________________________________ This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options, visit: http://lists.midrange.com/mailman/listinfo.cgi/midrange-l or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at http://archive.midrange.com/midrange-l.
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