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 is the process queue reference latch?

Tony van Lingen


Yes, except that this is version and that bug was fixed in The logs don't show that ora-600 error that precedes the
looping of PMON either..

Also, misses is almost twice as high as gets. I always thought that the
misses were a sub-set of the gets, which should set a max to the amount
of misses one could possibly get (misses <= gets). Is that correct?


Alberto Dell'Era wrote:

>> Does any-one know what the process queue reference latch does? I've
>> never seen it pop up in my monitors, but this morning in one database it
>> has an appalling miss rate:
>> NAME                                 WW     IMM
>> --------------------------------------------- ---------- ----------
>> -------------- ----------------
>> process queue reference               .020905483
>> 187.158241     2390210       4473475
>> (from v$latch: ww - miss ratio of willing-to-wait type gets, imm - miss
>> ratio of immediate gets, both in %)
>> This database is an Oracle 64bit on Solaris 9. Today only a
>> handful of users are logged on and they are perfoming some sort of
>> system test - they complain that the system is running like a dog and
>> this is the only anomality I could find.
> Maybe bug/note 3415971.8 may help; a lot of misses on
> "process queue reference" are a very likely side-effect of that bug,
> if I interpret correctly the description (I'm not a Support Specialist
> nor a kernel developer ;)


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