Please rebuild DBD::Oracle PERL module, making sure that you have all the ORACLE environment set-up on the machine, including ORACLE_HOME and LD_LIBRARY_PATH.
$ORACLE_HOME folder contains these three important folders:
ls -la $ORACLE_HOME
bin
lib
network
...
and it is defined as (please choose /adapt as needed):
ORACLE_HOME=/usr/lib/oracle/11.2/client64 (RHEL5, oracle-instantclient11.2-basic-11.2 rpm packages)
ORACLE_HOME=/usr/lib64/oracle/10.2.0.4/client64 (RHEL5, oracle-instantclient-basic-10.2.0.4 rpm packages)
ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_1 (Oracle 11g server installation)
And almost always:
LD_LIBRARY_PATH=$ORACLE_HOME/lib
(this is the folder where the "libclntsh.so.11.1" file is located!! and this LD_LIBRARY_PATH path will help PERL DB::Oracle module to find it!)
Below is an example for user environment set-up on a server with a Oracle 11g server:
cat /etc/profile.d/oracle-profile.sh
ORACLE_OWNER=oracle
ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_1
ORACLE_BASE=/home/oracle/app/oracle
PATH=$PATH:$ORACLE_HOME/bin
LD_LIBRARY_PATH=$ORACLE_HOME/lib
export ORACLE_OWNER ORACLE_HOME ORACLE_BASE PATH LD_LIBRARY_PATH
I hope it helps.