[Koha-bugs] [Bug 7886] C4/ShelfBrowser slow SQL performance

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

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=7886

--- Comment #4 from Dobrica Pavlinusic <dpavlin at rot13.org> ---
Created attachment 8895
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http://bugs.koha-community.org/bugzilla3/attachment.cgi?id=8895&action=edit
Bug 7886 - C4/ShelfBrowser slow SQL performance

ShelfBrowser uses two SQL queries with syntax

WHERE ((cn_sort = ? AND itemnumber < ?) OR cn_sort < ?)
AND homebranch = ? AND location = ? AND ccode = ?

homebranch already has index, and adding indexes on ccode and location
improves performance by 30% for each query since MySQL is able to use
index_merge intersect(items_ccode,homebranch,items_location)

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