http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=9011
--- Comment #136 from Katrin Fischer <katrin.fisc...@bsz-bw.de> --- (In reply to Nick Clemens from comment #130) > My consortium sponsored this development, and it has taken some time to > progress it this far forward. If MySQL performance is the only blocker right > now I would really like to see a solution that addresses that and unsticks > the bug rather than requiring a rewrite of the feature. > > I played around with the query and the below, while still containing a NOT > IN, eliminates the GROUP BY and improves speed significantly: > if ( C4::Context->preference('StoreLastBorrower') ) { > # Do not delete the newest old_issue for any itemnumber > $query .= " AND issue_id NOT IN ( SELECT issue_id FROM (Select > oi.issue_id from old_issues oi LEFT OUTER JOIN old_issues oi2 ON > oi.itemnumber=oi2.itemnumber AND oi2.issue_id>oi.issue_id WHERE > oi.borrowernumber= ? AND oi2.borrowernumber IS NULL) AS oi ) "; > push @bind_params, $borrowernumber; I haven't tested if this works, but I am hopeful it does and improves speed. > Another option is to just use the query labeleed as 'oi' above in a separate > update. It effectively finds all the 'last returned' info for a borrower > and would allow you to mark those somehow (say invert borrower number to > negative of borrowernumber) then perform the regular anonymizing, and then > update any rows with a negative borrowrnumber to a positive borrowernumber > (or whatever marker was used) This seems a bit hacky... but doesn't mean it couldn't work. > If the above queries don't work, a new table could work, though I do wonder > about the redundancy. I wonder if it would be possible to use the 'return' > column in old_issues to mark 'lastreturned' or something similar to allow > for easy SQL selection. Hm not sure how the return could be used - can you explain? Kyle, could you take a look at these options? -- You are receiving this mail because: You are watching all bug changes. _______________________________________________ Koha-bugs mailing list Koha-bugs@lists.koha-community.org http://lists.koha-community.org/cgi-bin/mailman/listinfo/koha-bugs website : http://www.koha-community.org/ git : http://git.koha-community.org/ bugs : http://bugs.koha-community.org/