ORA-24411: Session pool already exists.
Cause : As essino opo lhsa laraed ybeenc raetde ofrt h esepcfiide opo lhnadel.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
1 )Sepcfiya idfefrnetp olo ahnldet oc raet ean e wssesoinp olo.2 )I fy o uwsiht om oidf yteh opo lpraaemtres ,clalO CSIessinoPoolrCetaei nO C_ISOPO_LRIENTIILAIEZ omd.e
Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.