Portal | Manuals | References | Downloads | Info | Programs | JCLs | Master the Mainframes
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Usergroups Profile Log in to check your private messages Log in
 

 

Which is the best READ for this scenario?

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> Java & MQSeries
View previous topic :: :: View next topic  
Author Message
cooolguyin
Warnings : 1

New User


Joined: 12 May 2005
Posts: 10
Location: NY

PostPosted: Thu Jan 27, 2011 9:55 am    Post subject: Which is the best READ for this scenario?
Reply with quote

Hi,

If i want to read and update ALL the records in a adabas file then which of the following READ is efficient and why

READ PHYSICAL

READ BY ISN

READ BY LOGICAL

Thanks...
Back to top
View user's profile Send private message

Ats

New User


Joined: 21 Jul 2010
Posts: 6
Location: Roaming

PostPosted: Thu Jan 27, 2011 3:57 pm    Post subject: Reply to: Which is the best READ for this scenario?
Reply with quote

Well, it depends on data and different situations. All of them can be used for mass update.

READ PHYSICAL - Generally least expensive method to read all records however, potential double updates could be a problem

READ BY ISN - ISN use ensures no double updates & no missed updates

READ LOGICAL - Need to be careful when updating read key fields
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> Java & MQSeries All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts CICS VSAM RLS READ akodakka CICS 3 Tue Oct 04, 2016 3:09 pm
No new posts Multi row fetch - "for read only... Nileshkul DB2 3 Sun Aug 14, 2016 12:52 am
No new posts To read from Zeke scheduler p.anbuselvan CLIST & REXX 5 Thu Mar 31, 2016 1:13 am
No new posts How to read a excel sheet and load it... Radhika Nambiar Java & MQSeries 10 Wed Mar 30, 2016 4:49 pm
No new posts Read contents of PS file scorp_rahul23 JCL & VSAM 3 Mon Mar 28, 2016 10:28 pm


Facebook
Back to Top
 
Mainframe Wiki | Forum Rules | Bookmarks | Subscriptions | FAQ | Tutorials | Contact Us