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

block a field

David Boyd


Hi List,

We're in Oracle9i. We want to block a field in a table for users that don't
have the privilege to see its data. Currently we use a view and a security
table to do this.

create view t1_view
as select other_fields, decode(priv, 1, id, '') id
from t1, (select count(*) priv from security where user_name=user);

t1 is a huge table. The query does not use the index when I do (select *
from t1_view where id='123'). However if I create the view in following way
the performance is much better (note: I use 'select 1 from security' instead
of 'select count(*) from security').

create view t1_view
as select other_field, decode(priv, 1, id, '') id
from t1, (select 1 priv from security where user_name=user);

But the problem is if my user name is not in the security table, I got no
rows returned when I do (select * from t1_view) instead of just the id field
is blocked.

Does any one know if it's possible to return a value even a null value from
(select 1 from security where user_name=user) instead of no rows returned
when the user is not in the security table? or do you have a better way to
block a field?


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