diff --git a/README.mkd b/README.mkd
index 7dff9d2..800ff6a 100644
--- a/README.mkd
+++ b/README.mkd
@@ -5,7 +5,7 @@ Edit a copy of `archrepo.ini` and then run `./archreposrv <config>`.
 DEPENDENCIES
 ====
 
-* Python, &gt;= 3.3, with gdbm support
+* Python, &gt;= 3.3, with sqlite support
 * tornado, > 2.4.1
 * pyinotify, tested 0.9.4
 * winterpy
diff --git a/archrepo.ini b/archrepo.ini
index fbf954f..ba1cf16 100644
--- a/archrepo.ini
+++ b/archrepo.ini
@@ -11,6 +11,9 @@ path: /home/lilydjwg/tmpfs/test
 # A database to store package filenames. Default to ${path}/repofiles.db
 #files-db: /home/lilydjwg/tmpfs/test/repofiles.db
 
+# A database to store package info. Default to ${path}/pkginfo.db
+#info-db: /home/lilydjwg/tmpfs/test/pkginfo.db
+
 # Specify where to find these commands
 #command-add: repo-add
 #command-remove: repo-remove
diff --git a/archreposrv b/archreposrv
index 1919a96..5260519 100755
--- a/archreposrv
+++ b/archreposrv
@@ -7,7 +7,7 @@ import configparser
 from functools import partial
 import queue
 import logging
-import dbm.gnu
+import sqlite3
 
 import pyinotify
 from tornado.ioloop import IOLoop
@@ -17,8 +17,6 @@ import archpkg
 from myutils import enable_pretty_logging
 enable_pretty_logging(logging.DEBUG)
 
-# FIXME: 如果一个软件包消失了，那么如果它在仓库数据库里，它就应当从数据库删除。否则不应该
-
 class ActionInfo(archpkg.PkgNameInfo):
   def __new__(cls, path, action, four=None, five=None):
     if four is not None:
@@ -132,8 +130,13 @@ class EventHandler(pyinotify.ProcessEvent):
     self._ioloop = ioloop or IOLoop.instance()
 
     base = config.get('path')
-    dbname = config.get('files-db', os.path.join(base, 'repofiles.db'))
-    self._db = dbm.gnu.open(dbname, 'cs')
+    dbname = config.get('info-db', os.path.join(base, 'pkginfo.db'))
+    self._db = sqlite3.connect(dbname, isolation_level=None) # isolation_level=None means autocommit
+    self._db.execute('''create table if not exists pkginfo
+                        (filename text unique,
+                         pkgname text,
+                         pkgarch text,
+                         state int)''')
 
     dirs = [os.path.join(base, x) for x in ('any', 'i686', 'x86_64')]
     self.files = files = set()
@@ -145,7 +148,7 @@ class EventHandler(pyinotify.ProcessEvent):
     self._initial_update(files)
 
   def _initial_update(self, files):
-    oldfiles = {f.decode('utf-8') for f in self._db.keys()}
+    oldfiles = {f[0] for f in self._db.execute('select filename from pkginfo')}
 
     for f in files - oldfiles:
       if f.endswith('.pkg.tar.xz'):
@@ -227,16 +230,19 @@ class EventHandler(pyinotify.ProcessEvent):
     self._real_dispatch(d, act)
 
   def _real_dispatch(self, d, act):
-    key = act.path.encode('utf-8')
     if act.action == 'add':
+      self._db.execute('update pkginfo set state = 0 where pkgname = ? and pkgarch = ?', (act.name, act.arch))
       def callback():
-        self._db[key] = b'\x01'
+        self._db.execute(
+          'insert or replace into pkginfo (filename, pkgname, pkgarch, state) values (?, ?, ?, ?)',
+          (act.path, act.name, act.arch, 1))
     else:
+      res = self._db.execute('select state from pkginfo where filename = ? and state = 1 limit 1', (act.path,))
+      if tuple(res) == ():
+        # the file isn't in repo database, ignoring
+        return
       def callback():
-        try:
-          del self._db[key]
-        except KeyError:
-          logging.warn('files db inconsistent: key %s not there', key)
+        self._db.execute('delete from pkginfo where pkgfile = ?', (act.path,))
 
     act.callback = callback
     self.repomans[d].add_action(act)