Why does the RPM DB in Red Hat Eneterprise Linux 4 not updating the timestamps?

Issue

• The RPM DB is not up to date in Red Hat Enterprise Linux 4 , not updating the periodically.

[user1@test ~]$ uname -a
Linux test 2.6.9-89.0.23.ELsmp #1 SMP Fri Mar 5 17:56:21 EST 2010 i686 i686 i386 GNU/Linux
[user1@test ~]$ cd /var/lib/rpm; ls -lrt |grep db
-rw-r--r--  1 rpm rpm   450560 Sep 22  2012 __db.003
-rw-r--r--  1 rpm rpm  1318912 Sep 22  2012 __db.002
-rw-r--r--  1 rpm rpm    16384 Sep 22  2012 __db.001
[user1@test rpm]$

• Whereas for Red Hat Enterprise Linux 5 the db updates in every 10 minutes.

[user1@test rpm]$ uname -a
Linux test 2.6.18-274.el5 #1 SMP Fri Jul 8 17:36:59 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
[user1@test rpm]$ cd /var/lib/rpm; ls -lrt |grep db
-rw-r--r-- 1 root root   663552 Jan 12 13:30 __db.003
-rw-r--r-- 1 root root  1318912 Jan 12 13:30 __db.002
-rw-r--r-- 1 root root    24576 Jan 12 13:30 __db.001
[user1@test rpm]$