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

Problem upgrading from Windows 2000 Oracle 8.0.6 to Oracle

Paul Vincent


Hi everybody,

I've just installed Oracle onto a Windows 2000 server which was currently running Oracle 8.0.6 with a single instance on it. I noticed that during the installation, I wasn't presented with the Upgrading An Existing Database screen. This may be significant! I didn't think anything of it, since I intended to run the Database Upgrade Assistant independently after installing 9.2.

The installation went smoothly. I then checked that the 8.0.6 db instance was still up and running, by connecting to it from my office workstation. Yes, fine. Back to the server, and I fired up Database Upgrade Assistant from the Oracle 9.2 program group. After the Welcome screen it showed the panel which did indeed list my 8.0.6 database. I selected it, gave a userid with the necessary SYSDBA privileges, and a password, and clicked on next. Then I got an error message: ORA-12203: TNS unable to connect to destination.

Now, presumably this means I've got something wrongly configured on the server, such that it can't connect to its own local database. Any ideas at all, as to where I should start looking, would be very greatly appreciated!

Best regards,

Paul Vincent
Database Administrator
University of Central England
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