[Dovecot] Will upgrade from from db4 to libdb break anything?

Hello,

I just have a minor question. (Using Fedora 16)

My current dovecot (2.2.10) was compiled with db4 (4.8.30).

I am thinking of recompiling same dovecot (2.2.10) with libdb (5.2.36).

I will be trying on live server so just wanted to know if this will this break any indexing or anything else?

(Recompiling for Heartbleed, so might as well switch db version)

AM.