Error libdb.so.2: cannot open shared object file when installing Grid Control

I’m writing this post due that I receive this question almost once a week regarding OEM installations.
If you see this error when installing your Oracle Enterprise Manager (Grid Control 10.2.0.3) at OEL 5 or RHEL 5:

/home/oracle/OracleHomes/oms10g/Apache/Apache/bin/httpd: error while loading shared libraries: libdb.so.2: cannot open shared object file: No such file or directory

Don’t panic, all you need to do is:

1. Connect as root
2. Run : ln -s /usr/lib/libgdbm.so.2.0.0 /usr/lib/libdb.so.2
3. Problem solved, for more information please refer to: http://download.oracle.com/docs/cd/B19306_01/relnotes.102/b15659/toc.htm#CJAHFHCJ

Source: http://oraclenz.com/2009/12/15/error-libdbso2-cannot-open-shared-object-file-when-installing-grid-control/