Home      Mainframe Forum      Mainfarme Tutorials      IBM Manuals      Mainframe Interview Questions      Mainframe Books      IT News     SiteMap     Downloads


     
 
MAINFRAME - TIP OF THE DAY : When you specified V for RECFM parameter, LRECL value is largest record in the file plus 4 bytes. These four bytes contain the actual length of each variable length record in the file

Google
 
Web mainframegurukul.com

SQLCODE -811, why always 2nd row is fetched??

 
Post new topic   Reply to topic    mainframegurukul.com Forum Index -> DB2 INTERVIEW QUESTIONS
  View previous topic :: View next topic  
Author Message
sukhmeet
Member


Joined: 05 Aug 2010
Posts: 1

Answer was approved by Question owner.
Useful Post
0 votes
Not an useful post
Greate Post!! Salute Author
0 salutes

PostPosted: Thu Aug 05, 2010 5:06 pm    Post subject: SQLCODE -811, why always 2nd row is fetched?? Reply with quote

hi,

I want to know if their are multiple records(duplicate rows) in a Db2 table,
on fetching it I am getting the 2nd record everytime in my output file..(after handling sqlcode -811)

I want to know why?? why not 1st or 3rd record or any other??
_________________
sukhi
Back to top
View user's profile Send private message
Click here, If this post answer your question. <-- Click on right mark icon. If this post answer your question.

dbzTHEdinosauer
Moderator


Joined: 02 Oct 2006
Posts: 981

Answer was approved by Question owner.
Useful Post
0 votes
Not an useful post
Greate Post!! Salute Author
1 salutes

PostPosted: Thu Aug 05, 2010 6:14 pm    Post subject: Reply with quote

what is the version of your db2.

prior to vsn7,
db2 would always populate the host-variables with 'one of' the resultant rows,
but which was always unpredictable.

vsn7 and >>>
population of the host-variable by db2 on returning a -811 sqlcode, is not done.

and since it is a singleton select,
you do not have an order by,
your comment that it is the 2nd row is not based on definite predictability.
_________________
Dick Brenholtz
JCL, SQL and code in programs have an irritating habit of doing what you say,
not what you meant.
Back to top
View user's profile Send private message
Click here, If this post answer your question. <-- Click on right mark icon. If this post answer your question.
vinusha
Member


Joined: 26 Apr 2013
Posts: 1

Answer was approved by Question owner.
Useful Post
0 votes
Not an useful post
Greate Post!! Salute Author
1 salutes

PostPosted: Fri Apr 26, 2013 11:45 pm    Post subject: Duplication (-811) when handled fetches the second row.. ?? Reply with quote

It might not be a unpredictable..i'm not sure but the following might be a reason:
when the select query is executed, internally it would search for a match in criteria. After finding a first match it continue to search to ensure that there are no duplicates. Once it finds a second match it throws a duplication error(-811). If this error is handled, the latest fetched/accessed record would be the second row. Hence the second row is always fetched.

I hope this makes sense Smile
Back to top
View user's profile Send private message
Click here, If this post answer your question. <-- Click on right mark icon. If this post answer your question.
NicC
Active Member


Joined: 24 Jul 2011
Posts: 650
Location: Down on the pig farm

Answer was approved by Question owner.
Useful Post
0 votes
Not an useful post
Greate Post!! Salute Author
1 salutes

PostPosted: Sat Apr 27, 2013 1:04 pm    Post subject: Reply with quote

It makes sense but...there is no guarantee that the second row fetched was the same as the previous time this happened as DB2 does not guarantee the order unless you use ORDER which, I believe, can only be used with a cursor. Anyway, in the years that have passed since the original post things could have changed from what the OP and DBZ wrote.
_________________
Regards
Nic
Back to top
View user's profile Send private message
Click here, If this post answer your question. <-- Click on right mark icon. If this post answer your question.
academyindia4
Guest





Answer was approved by Question owner.
Useful Post
0 votes
Not an useful post
Greate Post!! Salute Author
0 salutes

PostPosted: Sat Jan 30, 2016 11:25 pm    Post subject: Topic deleted by Admin Reply with quote

<< Content deleted By Admin >>
Back to top
Click here, If this post answer your question. <-- Click on right mark icon. If this post answer your question.
academyindia4
Guest





Answer was approved by Question owner.
Useful Post
0 votes
Not an useful post
Greate Post!! Salute Author
0 salutes

PostPosted: Sat Jan 30, 2016 11:25 pm    Post subject: Topic deleted by Admin Reply with quote

<< Content deleted By Admin >>
Back to top
Click here, If this post answer your question. <-- Click on right mark icon. If this post answer your question.
Display posts from previous:   
Post new topic   Reply to topic    mainframegurukul.com Forum Index -> DB2 INTERVIEW QUESTIONS All times are GMT + 5 Hours
Page 1 of 1



 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Cobol Tutorial
This cobol tutorial covers most of the important topics like STRING, UNSTRING, COMP, COMP-3.....
DB2 Tutorial
DB2 Tutorial focuses on DB2 COBOL Programming. Explains in simple language. Some Chapters are locked, Forum members have free access to these chapters
CICS Tutorial
This CICS tutorial covers CICS concepts and CICS Basics, CICS COBOL Programming...
JCL Tutorial
This is most popular JCL tutorial from mainframegurukul. It does contain important jcl ....
SORT Tutorial
This Tutorial covers all important aspects of DFSORT. Has more SORT examples
INTERVIEW Questions
This page covers important interview questions
Mainframe Jobs
Mainframe Jobs posted by members of mainframegurukul forum
FaceBook Page
MainframeGurukul FaceBook Page
LinkedIn Page
MainframeGurkul Linkedin Page

This widget requires Flash Player 9 or better







Go to top of the page
 

Online ABEND Reference ||  JCL References ||  COBOL References ||  VSAM References ||  Tutorials by Drona Series ||  SQL tutorial ||  BOOKS  ||  DB2 INTERVIEW QUESTIONS ||  COBOL INTERVIEW QUESTIONS  ||  JCL INTERVIEW QUESTIONS ||  JCL2 INTERVIEW QUESTIONS ||  VSAM INTERVIEW QUESTIONS ||  CICS INTERVIEW QUESTIONS  ||  Online tutorials ||  Online ABEND Reference ||  JCL References ||  COBOL References ||  VSAM References ||  Tutorials by Drona Series ||  SQL tutorial ||  BOOKS  ||  SiteMap  ||  Expeditor Tutorial  ||  FILE-AID Tutorial  ||  Changeman Tutorial  ||  COBOL   ||  DB2   ||  JCL  ||  CICS  ||  VSAM  ||  DB2 Interview Questions ( 110 )   || Simple JCL Tutorials  || JCL Tutorial from MainframeGurukul.com   || Simple JCL Tutorial - Chapter1 ;|| Mainframe Forum - Tutorials  || Mainframe Tutorials || Mainframe CICS tutorial|| Mainframe COBOL Tutorial

Drona Educational Forums - Mainframe Cobol DB2 CICS Board
Powered by phpBB

mainframetopic-5254.html