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TNS:could not resolve the connect identifier specified
Backtrace message unwound by exceptions
invalid identifier
PL/SQL compilation error
internal error
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end-of-file on communication channel
TNS:listener unknown in connect descriptor
insufficient privileges
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ORACLE not available
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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: SQL Tuning -- large, long-running outer join query

Mladen Gogala

2006-01-19

Replies:

On 01/19/2006 08:08:48 AM, Thomas Jeff wrote:
> We have this purchased app that is generating the following query.  It
> runs
> for 8 hours then crashes due to ORA-1555. I'm reluctant to tinker with
> the undo settings or increase the undo tablespace size, as it appears
> from
> longops that this thing would likely run for another 7-8 hours before
> completing.

Why are you reluctant? Did you check V$UNDOSTAT? It tells you how many undo
blocks are used at any single time and how many active transactions there
were since the database startup (the TXNCOUNT value is cumulative).

> I'm at a loss on how to tune this -- I can't touch the
> physical structure, and I don't know enough to see any hints that could
> possibly help.
>
> Any ideas?
>
>
> SELET (boatload of columns)
> FROM
> TS_SALES_ORDLNS,   /*   465,175 rows, 20,930 blocks   */
> OD_SALES_ORDLNS,   /* 18,733,125 rows, 1,247,303 blocks */
> IA_SALES_ORDLNS,   /* 18,631,135 rows, 603,410 blocks  */
> TS_SALES_ORDLNS_HD, /*   474,465 rows, 25,819 blocks   */
> TS_SALES_ORDLNS_LN /*   472,645 rows, 14,043 blocks   */
> WHERE


As for the query, to rewrite it properly, I'd have to have some business
knowledge. I also notice that you don't have system statistics (no cpu
costing). Do you have histograms for all involved columns?
What percentage of the data do you want to retrieve? If you want to report
on the better part of the tables, then the plan might be right and you
may want to use brute force and change parallel degrees of the tables read
by the full table scan. The query looks like a star schema but getting
ORA-1555 indicates that you have an OLTP database. That means that bitmap
indexes are out of the question.


--
Mladen Gogala
http://www.mgogala.com
--
http://www.freelists.org/webpage/oracle-l