[Koha-bugs] [Bug 21901] New: Improve performance for serial registration

[bugzilla-daemon at bugs.koha-community.org]

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 at lists.koha-community.org
          Reporter: frank.hansen at ub.lu.se
        QA Contact: testopia at bugs.koha-community.org
                CC: colin.campbell at 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.

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