diff --git a/pisi.e3p b/pisi.e3p
index dcea1c19..0b37cdf2 100644
--- a/pisi.e3p
+++ b/pisi.e3p
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE Project SYSTEM "Project-3.8.dtd">
 <!-- Project file for project pisi -->
-<!-- Saved: 2005-12-06, 19:01:57 -->
+<!-- Saved: 2005-12-08, 18:50:27 -->
 <!-- Copyright (C) 2005 PiSi Development Team,  -->
 <Project version="3.8">
   <ProgLanguage mixed="0">Python</ProgLanguage>
@@ -462,6 +462,10 @@
       <Dir>tests</Dir>
       <Name>searchtests.py</Name>
     </Source>
+    <Source>
+      <Dir>pisi</Dir>
+      <Name>dbshelve.py</Name>
+    </Source>
   </Sources>
   <Forms>
   </Forms>
@@ -503,10 +507,10 @@
     <VcsOtherData>{'standardLayout': 1}</VcsOtherData>
   </Vcs>
   <FiletypeAssociations>
+    <FiletypeAssociation pattern="*.py" type="SOURCES" />
     <FiletypeAssociation pattern="*.ui.h" type="FORMS" />
-    <FiletypeAssociation pattern="*.ptl" type="SOURCES" />
     <FiletypeAssociation pattern="*.idl" type="INTERFACES" />
     <FiletypeAssociation pattern="*.ui" type="FORMS" />
-    <FiletypeAssociation pattern="*.py" type="SOURCES" />
+    <FiletypeAssociation pattern="*.ptl" type="SOURCES" />
   </FiletypeAssociations>
 </Project>
diff --git a/pisi/atomicoperations.py b/pisi/atomicoperations.py
index bbf9748a..130d6fd8 100644
--- a/pisi/atomicoperations.py
+++ b/pisi/atomicoperations.py
@@ -179,7 +179,6 @@ class Install(AtomicOperation):
                     if not ctx.ui.confirm(x):
                         raise Error(_('Package downgrade declined'))
 
-
             # schedule for reinstall
             self.old_files = ctx.installdb.files(pkg.name)
             self.old_path = ctx.installdb.pkg_dir(pkg.name, iversion, irelease)
diff --git a/pisi/component.py b/pisi/component.py
index 8ec4960d..fa2795ce 100644
--- a/pisi/component.py
+++ b/pisi/component.py
@@ -87,13 +87,15 @@ class ComponentDB(object):
     def close(self):
         self.d.close()
 
-    def has_component(self, name):
-        return self.d.has_key(str(name))
+    def has_component(self, name, txn = None):
+        return self.d.has_key(str(name), txn)
 
-    def get_component(self, name):
-        if not self.has_component(name):
-            self.d[name] = Component(name = name)
-        return self.d[name]
+    def get_component(self, name, txn = None):
+        def proc(txn):
+            if not self.has_component(name):
+                self.d[name] = Component(name = name)
+            return self.d[name]
+        return self.d.txn_proc(proc, txn)
 
     def list_components(self):
         list = []
@@ -101,27 +103,33 @@ class ComponentDB(object):
             list.append(pkg)
         return list
 
-    def update_component(self, component):
-        if self.d.has_key(component.name):
-            # preserve the list of packages
-            component.packages = self.d[component.name].packages
-        self.d[component.name] = component
+    def update_component(self, component, txn = None):
+        def proc(txn):
+            if self.d.has_key(component.name):
+                # preserve the list of packages
+                component.packages = self.d[component.name].packages
+            self.d[component.name] = component
+        self.d.txn_proc(proc, txn)
 
-    def add_package(self, component_name, package):
-        component = self.get_component(component_name)
-        component.packages.append(package)
-        self.d[component_name] = component # update
+    def add_package(self, component_name, package, txn = None):
+        def proc(txn):
+            component = self.get_component(component_name, txn)
+            component.packages.append(package)
+            self.d.put(component_name, component, txn) # update
+        self.d.txn_proc(proc, txn)
 
-    def remove_package(self, component_name, package):
-        if not self.has_component(component_name):
-            raise Error(_('Information for component %s not available') % component_name)
-        component = self.get_component(component_name)
-        component.packages.remove(package)
-        self.d[component_name] = component # update
+    def remove_package(self, component_name, package, txn = None):
+        def proc(txn):
+            if not self.has_component(component_name, txn):
+                raise Error(_('Information for component %s not available') % component_name)
+            component = self.get_component(component_name, txn)
+            component.packages.remove(package)
+            self.d.put(component_name, component, txn) # update
+        self.d.txn_proc(proc, txn)
 
-    def clear(self):
-        self.d.clear()
+    def clear(self, txn = None):
+        self.d.clear(txn)
 
-    def remove_component(self, name):
+    def remove_component(self, name, txn = None):
         name = str(name)
-        del self.d[name]
+        self.d.delete(name, txn)
diff --git a/pisi/index.py b/pisi/index.py
index ebb83fb6..3b0edc02 100644
--- a/pisi/index.py
+++ b/pisi/index.py
@@ -34,9 +34,11 @@ from pisi.uri import URI
 import pisi.component as component
 import pisi.specfile as specfile
 
+
 class Error(pisi.Error):
     pass
 
+
 class Index(XmlFile):
     __metaclass__ = autoxml.autoxml
 
diff --git a/pisi/installdb.py b/pisi/installdb.py
index e5792982..eaff85be 100644
--- a/pisi/installdb.py
+++ b/pisi/installdb.py
@@ -96,26 +96,33 @@ class InstallDB:
     def pkg_dir(self, pkg, version, release):
         return join(ctx.config.lib_dir(), pkg + '-' + version + '-' + release)
 
-    def is_recorded(self, pkg):
+    def is_recorded(self, pkg, txn = None):
         pkg = str(pkg)
-        return self.d.has_key(pkg)
+        def proc(txn):
+            return self.d.has_key(pkg)
+        return self.d.txn_proc(proc, txn)
 
-    def is_installed(self, pkg):
+    def is_installed(self, pkg, txn = None):
         pkg = str(pkg)
-        if self.is_recorded(pkg):
-            info = self.d[pkg]
-            return info.state=='i' or info.state=='ip'
-        else:
-            return False
+        def proc(txn):
+            if self.is_recorded(pkg, txn):
+                info = self.d.get(pkg, txn)
+                return info.state=='i' or info.state=='ip'
+            else:
+                return False
+        return self.d.txn_proc(proc, txn)
 
-    def list_installed(self):
-        list = []
-        for (pkg, info) in self.d.items():
-            if info.state=='i' or info.state=='ip':
-                list.append(pkg)
-        return list
+    def list_installed(self, txn = None):
+        def proc(txn):
+            list = []
+            for (pkg, info) in self.d.items(txn):
+                if info.state=='i' or info.state=='ip':
+                    list.append(pkg)
+            return list
+        return self.d.txn_proc(proc, txn)
 
     def list_pending(self):
+        # warning: reads the entire db
         dict = {}
         for (pkg, x) in self.dp.items():
             pkginfo = self.d[pkg]
@@ -139,18 +146,20 @@ class InstallDB:
         else:
             return False
 
-    def install(self, pkg, version, release, build, distro = ""):
+    def install(self, pkg, version, release, build, distro = "", txn = None):
         """install package with specific version, release, build"""
         pkg = str(pkg)
-        if self.is_installed(pkg):
-            raise InstallDBError(_("Already installed"))
-        if ctx.config.get_option('ignore_comar'):
-            state = 'ip'
-            self.dp[pkg] = True
-        else:
-            state = 'i'
-            
-        self.d[pkg] = InstallInfo(state, version, release, build, distro)
+        def proc(txn):
+            if self.is_installed(pkg, txn):
+                raise InstallDBError(_("Already installed"))
+            if ctx.config.get_option('ignore_comar'):
+                state = 'ip'
+                self.dp.put(pkg, True, txn)
+            else:
+                state = 'i'
+            self.d.put(pkg, InstallInfo(state, version, release, build, distro), txn)
+
+        self.d.txn_proc(proc,txn)
 
     def clear_pending(self, pkg):
         pkg = str(pkg)
@@ -188,4 +197,3 @@ def finalize():
     if db:
         db.close()
         db = None
-
diff --git a/pisi/packagedb.py b/pisi/packagedb.py
index 27505cfb..029bd732 100644
--- a/pisi/packagedb.py
+++ b/pisi/packagedb.py
@@ -67,24 +67,30 @@ class PackageDB(object):
 
     #TODO: list_upgrades?
 
-    def add_package(self, package_info):
+    def add_package(self, package_info, txn = None):
         name = str(package_info.name)
-        self.d[name] = package_info
-        for dep in package_info.runtimeDependencies():
-            dep_name = str(dep.package)
-            if self.dr.has_key(dep_name):
-                self.dr[dep_name].append( (name, dep) )
-            else:
-                self.dr[dep_name] = [ (name, dep) ]
-        # add component
-        ctx.componentdb.add_package(package_info.partOf, package_info.name)
-        # index summary and description
-        for (lang, doc) in package_info.summary.iteritems():
-            if lang in ['en', 'tr']:
-                pisi.search.add_doc('summary', lang, package_info.name, doc)
-        for (lang, doc) in package_info.description.iteritems():
-            if lang in ['en', 'tr']:
-                pisi.search.add_doc('description', lang, package_info.name, doc)
+        
+        def proc(txn):
+            self.d.put(name, package_info, txn)
+            for dep in package_info.runtimeDependencies():
+                dep_name = str(dep.package)
+                if self.dr.has_key(dep_name, txn):
+                    revdep = self.dr.get(dep_name, txn)
+                    revdep.append( (name, dep) )
+                    self.dr.put(dep_name, revdep, txn)
+                else:
+                    self.dr.put(dep_name, [ (name, dep) ], txn)
+            # add component
+            ctx.componentdb.add_package(package_info.partOf, package_info.name, txn)
+            # index summary and description
+            for (lang, doc) in package_info.summary.iteritems():
+                if lang in ['en', 'tr']:
+                    pisi.search.add_doc('summary', lang, package_info.name, doc)
+            for (lang, doc) in package_info.description.iteritems():
+                if lang in ['en', 'tr']:
+                    pisi.search.add_doc('description', lang, package_info.name, doc)
+
+        self.d.txn_proc(proc, txn)
 
     def clear(self):
         self.d.clear()