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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: optimizer time reported as?

K Gopalakrishnan



I am not sure whether the parse time is directly related with number of permutations as we have some code optimizations around that area. The parameters like optimizer_search_limit and _new_initial_join_orders=true takes care some of them.  And also to go to 80k permutations you need to have atleast 9 tables in that query which is quite uncommon in standard code .

I would file a bug (!) if that happens again :D


On 1/11/06, John Kanagaraj <john.kanagaraj@hds.com > wrote:
Note that in 10g, this parameter is hidden (becomes
"_optimizer_max_permutations"), and the value is defaulted to 2000.

Oracle seems to have noticed that the large default value in 8i was
probably incorrect. At least for Oracle's E-Biz Suite (Apps 11i), even
that based on a 8i database, this value necessarily needs to be set to
2000. I had helped someone (albeit on an Apps database) debug a query
that took 10 mins to parse (and less than a min to execute!)- the
parameter was incorrectly set to default and the query parsed and
performed under a minute.

So go ahead and satisfy our curiousity... What did sp_time (or is it
sp_systime_<Version>,sql!) point to?

John Kanagaraj <><
DB Soft Inc
Phone: 408-970-7002 (W)

Co-Author: Oracle Database 10g Insider Solutions

** The opinions and facts contained in this message are entirely mine
and do not reflect those of my employer or customers **


From: oracle-l-bounce@freelists.org
[mailto:oracle-l-bounce@freelists.org ] On Behalf Of Powell, Mark D
Sent: Wednesday, January 11, 2006 1:11 PM
To: oracle-l@freelists.org
Subject: RE: optimizer time reported as?

I remember the default on 8.1.7 being 80,000 and Oracle support had us
lower it to 2,000 while we were working on an ORA-04031 iTAR.

ora817 > @mon/parms
'For all columns: Y = Yes/True    N = No/False '
' D = Deferred,  I = Immediate,  S = System,  U = User session'
' Default indicator is unreliable if col SYS indicates chg '
Enter value for parameter: optimizer_max_permutations

                                                                    D S
                                                                    e e
y o d
NAME                            VALUE                               f s
s d j
------------------------------- ----------------------------------- - -
- - -
optimizer_max_permutations      80000                               Y Y
optimizer maximum join permutations per query block

So how did the performance test turn out?

HTH -- Mark D Powell --


        From: oracle-l-bounce@freelists.org
[mailto:oracle-l-bounce@freelists.org ] On Behalf Of Wolfson Larry -
        Sent: Wednesday, January 11, 2006 4:01 PM
        To: oracle-l@freelists.org
        Subject: optimizer time reported as?

        I got asked about performance on a database that was recently
upgraded from to

        Looking at the initora I noticed
        optimizer_max_permutations           integer

            The DBA doing the upgrade said she only changed the
parmaeters relating to the upgrade.
        I know the default changed from 8's 80000 to 9's 2000 and there
was an earlier TAR telling us to change the
        80000 to 79999.

            I thought this might be an issue and I ran Tim Gorman's
sp_time script to see where the overhead was.
        I just wanted to verify that the optimizer_max_permutations time
is accounted for in the
        Parsing SQL time and not somewhere else.

            Larry Wolfson