Thanks, I've opened bug report 7166.
Checked this on my production box, been running for over 12 months, only a few users:
[root@gateway0 bdb]# uname -a
Linux gateway0 2.6.18-308.13.1.el5PAE #1 SMP Tue Aug 21 17:50:26 EDT 2012 i686 athlon i386 GNU/Linux
Please follow at Bugzilla.
Reprint of last comment there:
#only two files - same size as yours:
[root@gateway0 bdb]# ls -laF /var/log/bdb/log.0000000001
-rw------- 1 ldap ldap 10485760 Sep 12 10:43 /var/log/bdb/log.0000000001
[root@gateway0 bdb]# ls -laF /var/log/bdb/log.0000000002
-rw------- 1 ldap ldap 10485760 Sep 17 19:27 /var/log/bdb/log.0000000002
System is native Raid1 (2 disks) and no problems whatsoever, including reconfigure time etc. It may be that your problem has nothing to do with the size of these logs.