$where[] = 'page_title <= ' . $dbr->addQuotes( $to );
global $wgMemc;
- $key = wfMemcKey( 'allpages', 'ns', $namespace, $from, $to );
+ $key = wfMemcKey( 'allpages', 'ns', $namespace, sha1( $from ), sha1( $to ) );
$lines = $wgMemc->get( $key );
$count = $dbr->estimateRowCount( 'page', '*', $where, __METHOD__ );