Certainly on windows running a select on a large file can "take out" an entire CPU for the duration.
Running multiple selections using partfiles *may* be quicker from the single user perspective but would tie up more CPU's. I suppose it's down to what the system is doing at the time. For most systems using half the CPU's for a query overnight is going to hurt but would be a major problem in the middle of a busy day. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Stevenson, Charles Sent: 23 March 2005 04:30 To: u2-users@listserver.u2ug.org Subject: RE: [U2] [UV] Distributed SELECTs for distributed (Type27) files From: Maresh, Mel Subject: RE: [U2] [UV] Distributed SELECTs for distributed (Type30) files ^^ Type27 > I colleague wrote and used the following code to select from a > specific distributed file, the GL.DETAIL file. He loved it, but > the system administrator has forbidden him from using it because > it's such a resources hog. a resource hog, huh? Hmmm. Thanks for the code example. I think I'd write it as a self-contained verb rather than writing temporary procs. The verb would have 2 modes, one for controlling the distributed select, the other mode for doing the individual selects on partfiles. In other words: [S]SELDIST GL.DETAIL WITH POST.DATE = "3/22" Program would notice GL.DETAIL was distributed and spawn the multiple phantoms: PHANTOM [S]SELDIST GL.DETAIL_[partno] WITH POST.DATE = "3/22" then collect the results when phantoms are done. (JOBS and NOTIFY commands will probably prove useful.) When SELDIST executes as a phantom, it would notice that it is dealing with a partfile, do the [s]select and save the list for its parent pid. I think I'd use the parent pid to control uniqueness. Assuming I do it at all. cds ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/ The information contained in this email is strictly confidential and for the use of the addressee only, unless otherwise indicated. If you are not the intended recipient, please do not read, copy, use or disclose to others this message or any attachment. Please also notify the sender by replying to this email or by telephone +44 (0)20 7896 0011 and then delete the email and any copies of it. Opinions, conclusions (etc.) that do not relate to the official business of this company shall be understood as neither given nor endorsed by it. IG Markets Limited and IG Index Plc are authorised and regulated by the Financial Services Authority and, in Australia, by the Australian Securities and Investments Commission. ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/
