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All this talk of converting to SQL-based tables does not take into account the issues around the journals associated with SQL collections (read that to mean a library, the various SYS* views in said library, and attendant journals and journal receivers). If you need to copy them to a different location, it is not pretty. There have been several posts here about this, and Kent Milligan has a white paper on this - I forget the link, try digging around at www.iseries.ibm.com/db2 - I find that SQL Server has some really nice stuff in its RESTORE DATABASE... functionality, but then it doesn't use journals, AFAIK, for transaction processing (commitment control to us iSeries folks).
I think we need something from IBM to handle this better. Maybe a way to put new library references into the journal receivers, and into the SYS* views - I don't know. They're smart folks and ought to be able to find a way for moving/copying a collection not to be so hard. I mean, they wrote CHGPF over a source member, right?
Whew!!! Vern At 01:11 PM 9/8/2005, you wrote:
Is there anyone who can explain this? Data Validation code! Or point to the original article? Thanks -----Original Message----- From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DeLong, Eric Sent: Wednesday, September 07, 2005 4:22 PM To: 'Midrange Systems Technical Discussion' Subject: RE: SFL Load - SQL vs. LF IBM has changed the data management rules for files created via DDL, which effective improves DB thruput for all applications using the file. Performance gains come from where IBM has chosen to implement the data validation code. Under DDS rules, data is validated when it is read from the disk, where DDL moves the validation to DB writes and updates. The theory is that a typical application will read data much more than it writes data. If we validate on write, then we've reduced IO overhead. iSeriesNetwork had an article about this..... Eric DeLong Sally Beauty Company MIS-Project Manager (BSG) 940-297-2863 or ext. 1863 -----Original Message----- From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of James H H Lampert Sent: Wednesday, September 07, 2005 1:09 PM To: Midrange Systems Technical Discussion Subject: Re: SFL Load - SQL vs. LF Billy Rowe <billyrowe@xxxxxxx> wrote: > No matter which presentation method you decide to you, > definitely create the tables/indexes/views with SQL. Why? -- JHHL (who is much more fluent in DDS and OPNQRYF than with SQL) -- 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/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. -- 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/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. -- 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/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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