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


Amir Gheibi


Hello everyone,

I use Oracle 10g R2 on Fedora Core 4, and I use password file.

The value of "os_authent_prefix" is "ops$", (default) and the os user that I'm able to login with it as sysdba using os authentication is named "oracle". (connect "/ as sysdba")

I've created a user in my database named ops$oracle with the code bellow:

create user ops$oracle identified by secret;
grant create session, dba to ops$oracle;

I can connect as sysdba from a remote windows client like this:
sqlplus "ops$oracle/secret@testDb as sysdba"

(testDb is the TNSNAME of that database in the tnsnames.ora file in windows)

but if I want to login to the database locally using the command bellow, I get "ORA-01031: insufficient privileges" error:

sqlplus "ops$oracle/secret@testDb as sysdba"

As soon as I remove "@testDb" from the command, it works:

sqlplus "ops$oracle/secret as sysdba".

My underestanding is if I want to connect locally and I use tnsname in the connection command, oracle will interpret it differently.

Could anyone make this clear for me that why oracle acts differently, please?


PS: For God's sake do not ask why am I doing this?