Oracle-L: Wrong Results Bug in Oracle 8.1.7.1

From: MacGregor, Ian A. <ian_at_SLAC.Stanford.EDU>
Date: Sat, 08 Jun 2002 18:58:19 -0800
Message-ID: <F001.004788BA.20020608185819@fatcity.com>

SQL> SELECT VOUCHER_ID FROM PS_VCHR_MM_VW WHERE ROWNUM < 10;

VOUCHER_

00003394
00003395
00003396
00003397
00003398
00003399
00003400
00003401
00003402

set feedback on

1 SELECT VOUCHER_ID FROM PS_VCHR_MM_VW 2* WHERE VOUCHER_ID = '00003394'
SQL> /
VOUCHER_

1 row selected.

Zounds !!! Select dump(voucher_id) shows that Oracle is returning a null here.

Here a function is used to force the query to do full tablescans

1 SELECT VOUCHER_ID FROM PS_VCHR_MM_VW 2* WHERE CONCAT(VOUCHER_ID,'A') = CONCAT('00003394', 'A') SQL> / VOUCHER_

00003394

I get the expected results if I force full table scans.

I looked at the explain plan for the failing query and rebuilt the ps_voucher index. This did not change its erroneous results. I rebuilt the view itself again to no avail. A check on Metalink revealed bug 1852163. Although this bug's conditions were different from the one above, their were some similarities. One workaround for bug 1852163

alter session set "_complex_view_merging" = true;

I tried this and the original query still gave improper results.

All queries against the component tables of the view work fine.

The view text is

CREATE VIEW SYSADM.PS_VCHR_MM_VW
AS
SELECT DISTINCT A.BUSINESS_UNIT, A.VOUCHER_ID, A.INVOICE_ID, A.INVOICE_DT, A.PROCESS_INSTANCE, A.ENTRY_STATUS, A.POST_STATUS_AP, A.MATCH_ACTION, C.PPV_POST_FLG, C.ERV_POST_FLG, A.ORIGIN FROM SYSADM.PS_VOUCHER A, SYSADM.PS_PO_LINE_MATCHED C WHERE A.BUSINESS_UNIT = C.BUSINESS_UNIT_AP AND A.VOUCHER_ID = C.VOUCHER_ID AND A.MATCH_ACTION IN ('Y', 'E')

If I run the select statement outside of the view and tack on the 'voucher_id = ' clause SELECT DISTINCT A.BUSINESS_UNIT, A.VOUCHER_ID, A.INVOICE_ID, A.INVOICE_DT, A.PROCESS_INSTANCE, A.ENTRY_STATUS, A.POST_STATUS_AP, A.MATCH_ACTION, C.PPV_POST_FLG, C.ERV_POST_FLG, A.ORIGIN FROM SYSADM.PS_VOUCHER A, SYSADM.PS_PO_LINE_MATCHED C WHERE A.BUSINESS_UNIT = C.BUSINESS_UNIT_AP AND A.VOUCHER_ID = C.VOUCHER_ID AND A.MATCH_ACTION IN ('Y', 'E')
and a.voucher_id = '00003394'
/

I get the expected results. The query plan matches the one for the failing statement.

If I select more than voucher_id from the view with the 'voucher_id = ' predicate the other fields are projected correctly, but returns voucher_id as null.

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_slac.stanford.edu

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-- 
Author: MacGregor, Ian A.
  INET: ian_at_SLAC.Stanford.EDU

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Received on Sat Jun 08 2002 - 21:58:19 CDT