https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=21901 Bug ID: 21901 Summary: Improve performance for serial registration Change sponsored?: --- Product: Koha Version: master Hardware: All OS: All Status: NEW Severity: major Priority: P5 - low Component: Serials Assignee: koha-bugs@lists.koha-community.org Reporter: frank.hansen@ub.lu.se QA Contact: testopia@bugs.koha-community.org CC: colin.campbell@ptfs-europe.com Because two indexes are missing, the SQL searches in C4::Serials perform very slow. Since theres no indexes for subscription.biblionumber and serial.subscriptionid, the SQL server will do a full table scans on both tables, which takes a very long time, especially if you have 100,000 subscriptions and approximately one million series registered. To improve response time, at least two indexes are required. I will therefore suggest these two indexes to be built: alter table serial add index idx_serial_subscriptionid using btree (subscriptionid); alter table subscription add index idx_subscription_biblionumber (biblionumber); It's also strange that the subscriptionid in serial is a varchar(100). In subscriptions table, subscriptionid is an int. I think subscriptionid in serial should be an int for safe and for best performance. -- You are receiving this mail because: You are the assignee for the bug. You are watching all bug changes.