Dear All, We tested failover functionality with "shutdown abort" or "shutdown immediate" and it works fine. But failover did not happen when one of the Node got crashed with follwoing error. ORA-00600: internal error code, arguments: [], [], [], [], [], [], [], [] Instance terminated by SMON, pid = 3245 My tnsnames.ora is configured like below. ========================================================= mydb= (DESCRIPTION= (FAILOVER=ON) (LOAD_BALANCE=ON) (ADDRESS=(PROTOCOL=TCP)(HOST=machine1)(PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST=machine2)(PORT=1521)) (CONNECT_DATA=(SERVICE_NAME=mydb.mycompany.com) (FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC)))) mydb1= (DESCRIPTION= (FAILOVER=ON) (ADDRESS=(PROTOCOL=TCP)(HOST=machine1)(PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST=machine2)(PORT=1521)) (CONNECT_DATA=(SERVICE_NAME=mydb.mycompany.com) (FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC)))) mydb2= (DESCRIPTION= (FAILOVER=ON) (ADDRESS=(PROTOCOL=TCP)(HOST=machine2)(PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST=machine1)(PORT=1521)) (CONNECT_DATA=(SERVICE_NAME=mydb.mycompany.com) (FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC)))) ====================================================== Could someone shed lights on this? Thanks Jay. ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------