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

Sqlnet / database links / advanced queueing - most unusual problem

Fedock, John (KAM.RHQ)



I have an interesting problem.  I was able to fix but unsure of why it worked.  I am looking to see if anyone can explain, as I cannot after 2 days.  I tried to make the below as precise and as simple as I could.


On a Unix HP server, I have one 8i database and one 10.1.x database running.  They each have the own separate ORACLE_HOMEs.  They each have their own tnsnames.ora file.   The variable TNS_ADMIN is pointing to the respective correct place.


In the 10.1.x database, I have a link going to another 10.1.x database on another server.  Logging in to sqlplus, I can use the link successfully (by querying global_name).  I can tnsping okay. Snapshots using the same link are okay.  Essentially the 10.1.x database is using it’s tnsnames.ora as expected.   


The problem occurs when using Oracle’s Advanced Queueing.  AQ’ing is using the 8i tnsnames.ora file.  I know this, as we started to get ora-12541 errors when the AQ processes were running.  After 2 days I could not figure out why, so on a lark I changed the 8i tnsnames.ora file, where it was incorrect, and then AQ’ing  started to work.   And yes, AQing is using the same link as I was.


So what I am seeing is AQ’ing is using the 8i tnsnames.ora to resolve the link and non AQ processing (snapshots, sqlplus, etc) is using the 10g tnsnames.ora to resolve the link. 


Any ideas?   I am out of ideas.



Thanks all.


John Fedock

"K" Line America, ISD Department