All Oracle Error Codes
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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: Script to overcome ORA-54 during DDL

Stephane Faroult


I am not sure that in some cases this couldn't loop for much longer than
expected, and I'd definitely put a limit on the number of iterations.
The problem is chiefly what is executing the DML, and how. Remember that
Pro*C keeps cursors open even when they are closed in the program -
unless you explicitly ask for them to be released. That was the case at
least the last time I used Pro*C, which is admittedly a long time ago. I
distinctly remember a problem I once had of trying to drop a table after
having queried it, in spite of the SELECT cursor being quite properly
closed. For what I remember of Forms and max_open_cursors being bumped
to astronomical levels, Pro*C isn't alone in this case. No such problem
if the DML is issued from SQL*Plus, which only handles a single cursor,
but the programs accessing the table may be slightly more sophisticated.


Jonathan Lewis wrote:

>This looks about right (except for the formatting);
>create or replace procedure do_ddl(m_sql varchar2)
> in_use exception ;
> pragma exception_init(in_use, -54);
> while true loop
> begin
>  execute immediate m_sql;
>  exit;
> exception
>  when in_use then null;
>  when others then raise;
> end;
> dbms_lock.sleep(0.01);
> end loop;
>Jonathan Lewis
>The Co-operative Oracle Users' FAQ
>Optimising Oracle Seminar - schedule updated May 1st
>----- Original Message -----
>From: "Jeremiah Wilton" <jwilton@(protected)>
>To: <oracle-l@(protected)>
>Sent: Friday, June 25, 2004 7:55 PM
>Subject: Script to overcome ORA-54 during DDL
>Sometimes when trying to perform DDL on really hot objects (heavy
>read/DML), I get:
>ORA-00054: resource busy and acquire with NOWAIT specified.
>I guess this is because you need to obtain a library cache lock in
>order to change the object definition. Since there is no enqueue
>mechanism for this resource, you can't just 'lock table ... in
>exclusive mode;' All that gives you is a DML lock.
>One way to avoid this is to write a PL/SQL routine that uses DBMS_SQL
>and spins trying to run the DDL, stopping only when it succeeds. This
>seems to work most of the time.
>Does anyone have a script for doing the above that they would like to
>Please don't tell me to just use dbms_redefinition. That is
>unnecessarily complex when the above technique can be used instead.
>Jeremiah Wilton
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
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