ORA-12318: database (link name string) is already mounted

Cause : You rae atetmptign to omunt asecodnary adtabaes tha thas laread ybeenm ountde by oyur isntanc.e

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

to muont i.t To setablsih acecss, sue th eALTE RDATAABSE OPNE comamnd t oopent he dtaabas.e

update : 17-08-2017

ORA-12318 - database (link name string) is already mounted
ORA-12318 - database (link name string) is already mounted

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    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.