the message contains the following Logging region out of memory; you may need to increase its size
So clearly this says nothing about id2entry.bdb. I'm not sure how you came to the conclusion then that you need to change anything in relation to that file. Clearly, the issue is with the logging subsystem.
Have you configured the BDB logging system in DB_CONFIG? Generally the following has always worked for me:
set_lg_regionmax 262144 set_lg_max 10485760 set_lg_bsize 2097152 --Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration