All Oracle Error Codes
Oracle DBA Forum

Frequent Oracle Errors

TNS:could not resolve the connect identifier specified
Backtrace message unwound by exceptions
invalid identifier
PL/SQL compilation error
internal error
missing expression
table or view does not exist
end-of-file on communication channel
TNS:listener unknown in connect descriptor
insufficient privileges
PL/SQL: numeric or value error string
TNS:protocol adapter error
ORACLE not available
target host or object does not exist
invalid number
unable to allocate string bytes of shared memory
resource busy and acquire with NOWAIT specified
error occurred at recursive SQL level string
ORACLE initialization or shutdown in progress
archiver error. Connect internal only, until freed
snapshot too old
unable to extend temp segment by string in tablespace
Credential retrieval failed
missing or invalid option
invalid username/password; logon denied
unable to create INITIAL extent for segment
out of process memory when trying to allocate string bytes
shared memory realm does not exist
cannot insert NULL
TNS:unable to connect to destination
remote database not found ora-02019
exception encountered: core dump
inconsistent datatypes
no data found
TNS:operation timed out
PL/SQL: could not find program
existing state of packages has been discarded
maximum number of processes exceeded
error signaled in parallel query server
ORACLE instance terminated. Disconnection forced
TNS:packet writer failure
see ORA-12699
missing right parenthesis
name is already used by an existing object
cannot identify/lock data file
invalid file operation
quoted string not properly terminated

Re: Strange RAC behaviour

Anand Rao



check your tnsnames.ora on the client pc as well as the server side for both instances.

have you defined service_names in spfile or init.ora? this value should exactly match service_name in tnsnames.ora.

what about the port id's? ensure that you have got them right on all sides. i feel there is a mismatch in the tnsnames.ora on one side. also, check if your sqlnet.ora is consistent on both sides.

are you using local_listener and remote_listener parameters? if you do, ensure they are all resolvable using tnsnames.ora.

i am assuming that you are not using FAN, Connection pools, etc...


On 13/01/06, johan Eriksson < johan.eriksson@bossmedia.se> wrote:
Hi all

I have a problem with our RAC env. which I cant figure out.

Oracle is 10r2 and the OS is RHEL 3 and we have 2 nodes in the RAC.

If i from machine 1 connects to rac1, rac2 it works and if I connect to
rac I am switched between the nodes as expected.
The same is for machine 2.

But if I connects from my pc (oracle 10r2 here also) and try to connect
to rac I alway gets into rac2, but 40% of the times I get the message:
ORA-12545: Connect failed because target host or object does not exist

which I intertpret as it tries to log me onto rac1 but fails to do so.

Am I right in my assumption and where to start solve the problem?