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Check what version of the Oracle client are you using !!! Any chance you're using an old version of the client that isn't aware of the TIMESTAMP data type !!! Verify your database version  like as : sql>select * from v$version;     You wouldn't get an ORA-03115 if the version of the Oracle database didn't support timestamps. You would get an ORA-03115 if you were using an outdated version of the Oracle client when connecting to the 10.2 database. What version of the Oracle client are you using? 

How to  prevent DB link creation First remove all the roles and just grant only required privileged.

GRANT   SELECT on all tables in a schema Single statement to grant privileges FOR   x   IN (SELECT * FROM user_tables) LOOP   EXECUTE IMMEDIATE   ‘GRANT SELECT ON   ‘ || x.table_name || ‘   TO   << someone >>’ ; END LOOP; OR DECLARE CURSOR   cur1 IS SELECT TABLE_NAME from user_tables; cmd varchar2(200); BEGIN FOR c in c1 LOOP cmd := ‘GRANT SELECT ON ‘||c.table_name||<< TO YOURUSERNAME>>’; execute immediate cmd; END LOOP; END;

There are few defaults Database Parameter value created at time of database creation and above that we can change them according to our requirements. Database parameters are environment variables for a database which can change database behavior according to value of the parameter. These are input values which are taken at time of database startup and continue until changed.

ORA-01033 Oracle initialization or shutdown in progress When you connect oracle 12c plug gable database, Thus time you have get oracle initialization or shutdown in progress error. This error occurred because pluggable database are not initialized. To fix this error connect as sysdba and run  ALTER PLUGGABLE DATABASE ALL OPEN    command. ALTER PLUGGABLE DATABASE ALL OPEN Thanks.

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