diff --git a/lib/db/ldb.js b/lib/db/ldb.js
index 35863b1b..7f389456 100644
--- a/lib/db/ldb.js
+++ b/lib/db/ldb.js
@@ -47,7 +47,7 @@ function ldb(options) {
 
     // For LMDB if we decide to use it:
     sync: options.sync || false,
-    mapSize: options.mapSize || 2 * (1024 << 20),
+    mapSize: options.mapSize || 10 * (1024 << 20),
     writeMap: options.writeMap || false,
     noSubdir: options.noSubdir !== false,
 
@@ -71,16 +71,19 @@ ldb.getBackend = function getBackend(db) {
     db = 'memory';
 
   switch (db) {
+    case 'ldb':
     case 'leveldb':
     case 'leveldown':
       name = 'leveldown';
       ext = 'ldb';
       break;
+    case 'rdb':
     case 'rocksdb':
     case 'rocksdown':
       name = 'rocksdown';
       ext = 'rdb';
       break;
+    case 'mdb':
     case 'lmdb':
       name = 'lmdb';
       ext = 'mdb';