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Continue to ChatDBMS_TNS package for tnsping in database Oracle 12.2 http://oracle-help.com/oracle-12c/oracle-12cr2/dbms_tns-package-tnsping-database-oracle-12-2/
DBMS_TNS package for tnsping in database Oracle 12.2 http://oracle-help.com/oracle-12c/oracle-12cr2/dbms_tns-package-tnsping-database-oracle-12-2/