Error when install Oracle Enterprise Manager 10g Release 5 (10.2) on RHEL 5 i386

File : /oracle/product/10.2.0/oms10g/opmn/logs/HTTP_Server~1
/oracle/product/10.2.0/oms10g/Apache/Apache/bin/apachectl start: execing httpd
/oracle/product/10.2.0/oms10g/Apache/Apache/bin/httpd: error while loading shared libraries: libdb.so.2: cannot open shared object file: No such file or dire

[oracle@tatshuya ~]$ ls -l /usr/lib/libdb.so.2
ls: /usr/lib/libdb.so.2: No such file or directory

++ resolve by ++
[oracle@tatshuya ~]$ sudo ln -s /usr/lib/libgdbm.so.2.0.0 /usr/lib/libdb.so.2

++ check again ++
[oracle@tatshuya ~]$ ls -l /usr/lib/libdb.so.2
lrwxrwxrwx 1 root root 25 Dec 17 10:42 /usr/lib/libdb.so.2 -> /usr/lib/libgdbm.so.2.0.0

then try to stop & start opmn manual again
[oracle@tatshuya ~]$ /oracle/product/10.2.0/oms10g/opmn/bin/opmnctl stopall
[oracle@tatshuya ~]$ /oracle/product/10.2.0/oms10g/opmn/bin/opmnctl startall


check log again
File : /oracle/product/10.2.0/oms10g/opmn/logs/HTTP_Server~1

09/12/17 10:44:34 Stop process
--------
/oracle/product/10.2.0/oms10g/Apache/Apache/bin/apachectl stop: httpd stopped

--------
09/12/17 10:44:51 Start process
--------
/oracle/product/10.2.0/oms10g/Apache/Apache/bin/apachectl start: execing httpd

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== TaTsHuYa ==