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)
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
KEY `homebranch` (`homebranch`),
KEY `holdingbranch` (`holdingbranch`),
KEY `itemcallnumber` (`itemcallnumber`),
+ KEY `items_location` (`location`),
+ KEY `items_ccode` (`ccode`),
CONSTRAINT `items_ibfk_1` FOREIGN KEY (`biblioitemnumber`) REFERENCES `biblioitems` (`biblioitemnumber`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `items_ibfk_2` FOREIGN KEY (`homebranch`) REFERENCES `branches` (`branchcode`) ON UPDATE CASCADE,
CONSTRAINT `items_ibfk_3` FOREIGN KEY (`holdingbranch`) REFERENCES `branches` (`branchcode`) ON UPDATE CASCADE
SetVersion($DBversion);
}
+$DBversion = "3.07.00.XXX";
+if ( C4::Context->preference("Version") < TransformToNum($DBversion) ) {
+ $dbh->do("CREATE INDEX items_location ON items(location)");
+ $dbh->do("CREATE INDEX items_ccode ON items(ccode)");
+ print "Upgrade to $DBversion done (items_location and items_ccode indexes added for ShelfBrowser)";
+ SetVersion($DBversion);
+}
+
=head1 FUNCTIONS
=head2 DropAllForeignKeys($table)