That is one of the messages you can get when you need to re-execute a command because the information is not available on the instance you are now accessing after a TAF event. Check out Which are the Oracle Errors (TAF Events) to be Handled for RAC Failover - 337178.1. Eric Gross Mr. Database GridApp Systems Ph: 646-452-4050 egross@xxxxxxxxxxx ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Ujang Jaenudin Sent: Monday, February 19, 2007 11:30 PM To: Hemant K Chitale Cc: oracle-l@xxxxxxxxxxxxx Subject: Re: rac & client connection ok hemant, thanks. i got the solution. but when trying TAF, still got problem. SQL> SELECT instance_name, host_name, 2 NULL AS failover_type, 3 NULL AS failover_method, 4 NULL AS failed_over 5 FROM v$instance 6 UNION 7 SELECT NULL, NULL, failover_type, failover_method, failed_over 8 FROM v$session 9 WHERE username = 'SYSTEM'; INSTANCE_NAME HOST_NAME FAILOVER_TYPE FAILOVER_M FAI ---------------- ------------------------------------------- ------------- ---------- --- racdb3 rac3pub NONE NONE NO SELECT BASIC YES got error when execute this on node3 and later I shutdown abort the racdb3 instance. select * from sh.sales; ERROR: ORA-25401: can not continue fetches 5085 rows selected #tnsnames entry: RACDB = (DESCRIPTION= (ADDRESS_LIST= (LOAD_BALANCE=ON) (FAILOVER=ON) (ADDRESS=(PROTOCOL=TCP)(HOST=10.1.3.71)(PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST= 10.1.3.81)(PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST=10.1.3.91)(PORT=1521)) ) (CONNECT_DATA= (SERVICE_NAME=racdb) (FAILOVER_MODE= (TYPE=SELECT) (METHOD=BASIC) (RETRIES=500) (DELAY=5) ) ) ) #as remote listener on all nodes , here i put TAF & load balance entries too LISTENERS_RACDB = (DESCRIPTION = (ADDRESS_LIST = (LOAD_BALANCE=ON) (FAILOVER=ON) (ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.3.71)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.3.81)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.3.91)(PORT = 1521)) (LOAD_BALANCE = yes) ) (CONNECT_DATA = (SERVICE_NAME = racdb) (FAILOVER_MODE= (TYPE=SELECT) (METHOD=BASIC) (RETRIES=500) (DELAY=5) ) ) ) #as local listener on node1 and the rest node is similar...except ip address and name LISTENER_RACDB1 = (ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.3.71)(PORT = 1521)) regards ujang On 2/20/07, Hemant K Chitale <hkchital@xxxxxxxxxxxxxx> wrote: ORA-12545 would mean that DNS lookups for rac1pub/rac2pub/rac3pub are failing. Do a command-line "PING" to see if the Windows client can see those hostnames. Check if they are in the DNS server. If you errors are "random" it could just mean that the Windows client isn't finding the hostname it is attempting. You have configured LOAD_BALANCE so the client would not always atttempt the same name "rac1pub" -- at times it would attempt "rac2pub" or "rac3pub" -- and one of them is missing from DNS lookups. If you don't use a DNS server, you'd have to hardcode those entries in WINNT\SYSTEM32\DRIVERS\ETC\HOSTS Hemant At 10:21 AM Tuesday, Ujang Jaenudin wrote: >ERROR: >ORA-12545: Connect failed because target host or object does not exist > >and this only happen on windows client, while in linux client it >doesn't happen. > >regards >ujang > > Hemant K Chitale http://web.singnet.com.sg/~hkchital and http://hemantoracledba.blogspot.com -- regards ujang