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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

Strange RAC behaviour

Johan Eriksson

2006-01-13

Replies:
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?

/johan
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