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

Re: what's the diffrent between offline and offline drop

Jared Still


OFFLINE DROP is what you do to drop a datafile from a database
that is in no-archivelog mode. To completely remove it from the
data dictionary you must also drop the tablespace.

From the fine manual:


If the database is in NOARCHIVELOG mode, you must specify the DROP
clause to take a datafile offline. However, the DROP clause does not
remove the datafile from the database. To do that, you must drop the
tablespace in which the datafile resides. Until you do so, the
datafile remains in the data dictionary with the status RECOVER or

If the database is in ARCHIVELOG mode, Oracle ignores the DROP keyword.

On Mon, 27 Dec 2004 06:08:10 -0800 (PST), Joe Cooper
> I'm away from my office this week, and currently (conveniently?) away from my VPN access, so this response is strictly from memory. However, if memory serves me correctly, the difference is that on *NIX systems, 'offline drop' not only makes the datafile unavailable to the Oracle instance, it removes the datafile from the O/S (freeing the disk space for other uses). Thus, if you use the 'drop' option and don't have adequate backups elsewhere, you'd have a hard time recovering the file. As you have clearly demonstrated, it appears to make no difference on Windows systems.
> Of course, this is from memory, so any corroboration (or opposing view) is welcome.

Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist