tns-12560 message 12560 not found

Sometimes Users Cannot access to Database You Need To check The following :

Sqlplus / as sysdba

Show parameter local_listener ;

You have to see output like this :

local_listener            (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=you-ip-address)(PORT=1521))))

  If you see Null Value Do the Following :

Alter system set local_listener=’(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.250.25)(PORT=1521))))‘ scope=memory ;

Or For Real Application :

Alter system set local_listener=’(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.250.25)(PORT=1521))))‘ scope=memory sid=’you-node-name’;

Scope = memory For Test Purpose

Sql > Alter system register ;

Now You should see database name service on listener ;

to Apply these Changes all we have to do is scope=spfile like the following :

Alter system set local_listener=’(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.250.25)(PORT=1521))))‘ scope=spfile ;

Or For Real Application :

Alter system set local_listener=’(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.250.25)(PORT=1521))))‘ scope=spfile sid=’you-node-name’;

Thank you
Osama Mustafa