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Smells like oracle bug?

Smells like oracle bug?

2006-07-13       - By Laimutis Nedzinskas

Reply:     1     2     3     4     5     6     7     8     9     10     >>  

I had the same thing with null values and function-based indexes. Oracle does
not like it.


__ ____ ____ ____ ____ ____ ____

From: oracle-l-bounce@(protected) [mailto:oracle-l-bounce@(protected)] On
Behalf Of Jared Still
Sent: 13. j�l� 2006 16:04
To: gints.plivna@(protected)
Cc: oracle-l
Subject: Re: Smells like oracle bug?


It appears that Oracle is taking your hint quite seriously.

As there is no data in idx2 due to the only value in the
id2 column being null, Oracle is not returning any rows.

Take idx2 out of the hint, and you get data.

--
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist



On 7/13/06, Gints Plivna <gints.plivna@(protected)> wrote:

  ...
  SQL> create index idx2 on blahh (id2);
 
  Index created.
 
  SQL> insert into blahh values (1, null);
 
  1 row created.
 
  ...
 
  SQL> select 'x' from dual where exists (
   2    select /*+ index_ffs (blahh idx1 idx2) */ 'z' from blahh where
   3    (id1 = 1 and id2 is null) or (id1 is null and id2 = 1))
   4  /
 
  no rows selected
 
 
 



Fyrirvari/Disclaimer
http://www.landsbanki.is/disclaimer

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<DIV dir=ltr align=left><SPAN class=815591116-13072006><FONT face=Arial
color=#0000ff size=2>I had the same thing with null values and function-based
indexes. Oracle does not like it.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=815591116-13072006></SPAN>&nbsp;</DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)] <B>On Behalf Of </B>Jared
Still<BR><B>Sent:</B> 13. j�l� 2006 16:04<BR><B>To:</B>
gints.plivna@(protected)<BR><B>Cc:</B> oracle-l<BR><B>Subject:</B> Re: Smells
like
oracle bug?<BR></FONT><BR></DIV>
<DIV></DIV>It appears that Oracle is taking your hint quite seriously.<BR><BR
>As
there is no data in idx2 due to the only value in the<BR>id2 column being null,
Oracle is not returning any rows.<BR><BR>Take idx2 out of the hint, and you get
data. <BR><BR>-- <BR>Jared Still<BR>Certifiable Oracle DBA and Part Time Perl
Evangelist<BR><BR><BR>
<DIV><SPAN class=gmail_quote>On 7/13/06, <B class=gmail_sendername>Gints
Plivna</B> &lt;<A
href="mailto:gints.plivna@(protected)">gints.plivna@(protected)</A>&gt;
wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204
,204) 1px solid">...<BR>SQL&gt;
 create index idx2 on blahh (id2);<BR><BR>Index created.<BR><BR>SQL&gt; insert
 into blahh values (1, null);<BR><BR>1 row created.<BR><BR>...<BR><BR>SQL&gt;
 select 'x' from dual where exists
 (<BR>&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;select /*+ index_ffs (blahh idx1
 idx2) */ 'z' from blahh where <BR>&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;(id1 =
 1 and id2 is null) or (id1 is null and id2 =
 1))<BR>&nbsp;&nbsp;4&nbsp;&nbsp;/<BR><BR>no rows
selected<BR><BR><BR></BLOCKQUOTE></DIV><BR>
<P><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: Arial"><BR>Fyrirvari
/Disclaimer<BR><A
href="http://www.landsbanki.is/disclaimer"><SPAN
style="COLOR: gray">http://www.landsbanki.is/disclaimer</SPAN></A><o:p></o:p><
/SPAN></P>
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