Ticket #15170: 15170.2.diff

wp-admin/includes/list-table-sites.php

@@ -32 +32 @@
                 $s = isset( $_REQUEST['s'] ) ? stripslashes( trim( $_REQUEST[ 's' ] ) ) : '';
                 $like_s = esc_sql( like_escape( $s ) );
 
+                $large_network = false;
+                // If the network is large and a search is not being performed, show only the latest blogs with no paging in order
+                // to avoid expensive count queries.
+                if ( !$s && ( get_blog_count() >= 10000 ) ) {
+                        if ( !isset($_REQUEST['orderby']) )
+                                $_GET['orderby'] = $_REQUEST['orderby'] = 'registered';
+                        if ( !isset($_REQUEST['order']) )
+                                $_GET['order'] = $_REQUEST['order'] = 'DESC';
+                        $large_network = true;
+                }
+
                 $query = "SELECT * FROM {$wpdb->blogs} WHERE site_id = '{$wpdb->siteid}' ";
 
                 if ( isset( $_REQUEST['searchaction'] ) ) {
@@ -63 +74 @@
                 $order = ( isset( $_REQUEST['order'] ) && 'DESC' == strtoupper( $_REQUEST['order'] ) ) ? "DESC" : "ASC";
                 $query .= $order;
 
-                $total = $wpdb->get_var( str_replace( 'SELECT *', 'SELECT COUNT( blog_id )', $query ) );
+                // Don't do an unbounded count on large networks
+                if ( ! $large_network )
+                        $total = $wpdb->get_var( str_replace( 'SELECT *', 'SELECT COUNT( blog_id )', $query ) );
 
                 $query .= " LIMIT " . intval( ( $pagenum - 1 ) * $per_page ) . ", " . intval( $per_page );
                 $this->items = $wpdb->get_results( $query, ARRAY_A );
 
+                if ( $large_network )
+                        $total = count($this->items);
+
                 $this->set_pagination_args( array(
                         'total_items' => $total,
                         'per_page' => $per_page,