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


Graeme Farmer


Don't forget ".tnsnames.ora" in the $HOME of the user on Unix, overrides
them all (on the platforms I've tested it on anyway)...
Thomas, can you show proof of the tnsnames.ora being used in your search
path? I don't see any evidence of it looking there...

> strace tnsping remprd 2>&1|grep tnsnames.ora
access("/oracle/.tnsnames.ora", F_OK)  = -1 ENOENT (No such file or
access("/etc/tnsnames.ora", F_OK)     = -1 ENOENT (No such file or
access("/oracle/product/9i/network/admin/tnsnames.ora", F_OK) = 0
{st_mode=S_IFREG|0644, st_size=7978, ...}) = 0
open("/oracle/product/9i/network/admin/tnsnames.ora", O_RDONLY) = 5



> A slight correction:
> The search order is
> 5 A stray tnsnames.ora file somewhere directly in your path.  <=====
> 2. The Global Configuration Directory (e.g. /etc or /var/opt/oracle)
> 3. Then $ORACLE_HOME/network/admin
> PS.. TNS_ADMIN is stricly optional. We don't use it. We rely on the
> tnsnames.ora file to be in the $ORACLE_HOME/network/admin directory.
> Tom Mercadante
> Oracle Certified Professional
> -----Original Message-----
> From: Feighery, Raymond (RBS Insurance)
> [mailto:Raymond.Feighery@(protected)]
> Sent: Thursday, November 04, 2004 11:19 AM
> To: 'george.rusnak@(protected)
> Subject: RE: TNS_ADMIN
> The search order is
> 2. The Global Configuration Directory (e.g. /etc or /var/opt/oracle) 3.
> $ORACLE_HOME/network/admin
> I suspect you have a tnsnames.ora in /etc with no definition for your
> database.
> Ray
> -----Original Message-----
> From: Rusnak, George A. (SEC-Lee) CTR [mailto:george.rusnak@(protected)]
> Sent: Thursday, November 04, 2004 3:59 PM
> To: oracle-l@(protected)
> Subject: TNS_ADMIN
> Group,
> HOST MACHINE: HP-UX B.11.11 U 9000/800
> ORACLE : Oracle9i Enterprise Edition Rel. - 64 bit
> LISTENER: Version
> TNSNAMES.ORA: ls -lai $ORACLE_HOME/network/admin/tnsnames.ora
>               -rw-r--r--  1 oracle   dba    6546 Nov 3
> /opt/oracle/product/9.2.0/network/admin/tnsnames.ora
>  rusnakga>unset TNS_ADMIN
>  SQL>   select count(*)
>          from ses_army@(protected);
>          from ses_army@(protected)
>                           *
>      ERROR at line 2:
>      ORA-12154: TNS:could not resolve service name
>   rusnakga>export TNS_ADMIN=$ORACLE_HOME/network/admin
>   SQL> select count(*)
>         from ses_army@(protected);
>          COUNT(*)
>          ----------
>            3
> The tnsnames.ora is in the default location and it is not found until
> TNS_ADMIN is set. How do I find out where TNS_ADMIN is pointing at the
> system level, if there is such a thing ? Why do I have to set TNS_ADMIN
> the session level ?????
> TIA,
> Al Rusnak
> Oracle Certified Professional
> DBA - CISIS, Computer Operations
> * 804-734-8210
> * george.rusnak@(protected)
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