Home
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: standbys and unrecoverable operations

chao zhu

2005-11-17

Replies:
unrecoverable_change is from v$datafile, which is from controlfile,
not from datafile header.

if you refresh controlfile at standby, this all the information at
standby v$datafile is incorrect.

It is very hard to detect. in a complex production environment.

enable force_logging in 9i is a good idea for standby

On 11/16/05, Bobak, Mark <Mark.Bobak@(protected):
> Josh,
>
> I'm not a standby or DataGuard expert, but, think about what the
> unrecoverable change # represents. It's the SCN at which the last
> unrecoverable operation occurred on that datafile. So, if the primary is
> ahead of the standby, that means there are operations which have occurred on
> the primary which did not propogate to the standby. This is a corruption
> waiting to happen. If you activate the standby and a datablock is accessed
> that was loaded unrecoverable on the primary, you'll encounter an ORA-26040.
>
> So, I assume (don't have a standby setup handy to confirm it) that the
> default safe position is that they are equal, since, when you clone from the
> primary to initially create the standby, they'd (presumably) be equal. At
> that point, the only way for them to get out of sync is if you do an
> unrecoverable (aka nologging) load in the primary database.
>
> Corrections welcome from those with actual DG and standby experience! ;-)
>
> Hope that helps,
>
> -Mark
>
> PS Note that in 9i (can't remember if it was 9.0.1 or 9.2.0 intorduction)
> you can do ALTER DATABASE FORCE_LOGGING=TRUE; and everything will log, even
> if people try to do nologging loads.
> ________________________________
> From: oracle-l-bounce@(protected)]
> On Behalf Of Josh Collier
> Sent: Tuesday, November 15, 2005 4:52 PM
> To: oracle-l@(protected)
> Subject: standbys and unrecoverable operations
>
>
> Greetings,
>
> The Oracle documentation says that if the unrecoverable_change# for a
> datafile reported (v$datafile) by the primary is greater than that reported
> by the standby then you will need to recover that datafile (by copying it
> over from the primary) in order to avoid block corruption errors if the
> standby is activated.
>
> Does this also hold if the unrecoverable_change# are identical?
>
> have a good day,
>
> Josh C.


--
Regards
Zhu Chao
www.cnoug.org
--
http://www.freelists.org/webpage/oracle-l