Thanks Wally, By primary groups, does that mean the key and data sections? In other words, if there are no level 1 or 2 overflows, does that mean the entire file will be read into memory?
-----Original Message----- From: u2-users-boun...@listserver.u2ug.org [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Wally Terhune Sent: Tuesday, 15 December 2009 12:22 AM To: U2 Users List Subject: Re: [U2] SELECTs on FILEs There is a 'key section' to each group in a UniData hashed file. If you have no level 2 overflow, selecting on the keys will result in just the primary groups being read from disk. Wally Terhune U2 Support Architect Rocket Software 4700 S. Syracuse Street, Suite 400 **Denver, CO 80237 **USA Tel: +1.720.475.8055 Email: wterh...@rs.com Web: www.rocketsoftware.com/u2 -----Original Message----- From: u2-users-boun...@listserver.u2ug.org [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Dan McGrath Sent: Sunday, December 13, 2009 5:15 PM To: U2 Users List Subject: [U2] SELECTs on FILEs Hi all, Just a quick question on SELECTs for UD. I was under the impression that performing a wildcard SELECT with @ID would only result the key section of a FILE been read. Eg, SELECT MYFILE WITH @ID = "prefix]" Is this incorrect? Does it actually result in the entire FILE being read into memory to complete this SELECT? Regards, Dan ######################################################################## ################### The information transmitted in this message and attachments (if any) is intended only for the person or entity to which it is addressed. The message may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. The intended recipient of this e-mail may only use, reproduce, disclose or distribute the information contained in this e-mail and any attached files with the permission of IMB. ######################################################################## ################### _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ ########################################################################################### The information transmitted in this message and attachments (if any) is intended only for the person or entity to which it is addressed. The message may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. The intended recipient of this e-mail may only use, reproduce, disclose or distribute the information contained in this e-mail and any attached files with the permission of IMB. ########################################################################################### _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users
