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

phantom dblink

Mike Hennesy


I routinely refresh my DEV instance with a backup of my PROD instance. After I test recovering PROD on the dev machine I create a new control file and rename the instance to DEV with the following:


Now for the strange part. In DEV there is NOT a dblink for PROD but the query

select * from APP_TABLE@(protected) ;

returns rows. I would expect a ORA-02019 error. The returned rows are actually coming from the DEV instance and not PROD.

This isn't the end of the world for me by no means. The instance will be refreshed over the weekend and I told the programmers there isn't a dblink to PROD and to not try. I just thought this was a strange behavior and was wondering if anyone else had come across it.

Thanks - Mike

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