diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -1164,6 +1164,12 @@
             ui.write("\t%d -> %d\n" % (r.rev(pp[1]), i))
     ui.write("}\n")
 
+@command('debugindexstats', [])
+def debugindexstats(ui, repo):
+    """show stats related to the changelog index"""
+    repo.changelog.shortest(nullid, 1)
+    ui.write('%s\n' % repo.changelog.index.stats())
+
 @command('debuginstall', [] + cmdutil.formatteropts, '', norepo=True)
 def debuginstall(ui, **opts):
     '''test Mercurial installation
diff --git a/tests/test-completion.t b/tests/test-completion.t
--- a/tests/test-completion.t
+++ b/tests/test-completion.t
@@ -94,6 +94,7 @@
   debugignore
   debugindex
   debugindexdot
+  debugindexstats
   debuginstall
   debugknown
   debuglabelcomplete
@@ -282,6 +283,7 @@
   debugignore: 
   debugindex: changelog, manifest, dir, template
   debugindexdot: changelog, manifest, dir
+  debugindexstats: 
   debuginstall: template
   debugknown: 
   debuglabelcomplete: 
diff --git a/tests/test-help.t b/tests/test-help.t
--- a/tests/test-help.t
+++ b/tests/test-help.t
@@ -942,6 +942,8 @@
    debugindex    dump index data for a storage primitive
    debugindexdot
                  dump an index DAG as a graphviz dot file
+   debugindexstats
+                 show stats related to the changelog index
    debuginstall  test Mercurial installation
    debugknown    test whether node ids are known to a repo
    debuglocks    show or modify state of locks