Solved

Select for update

Posted on 2004-03-23
9
158 Views
Last Modified: 2010-03-31
When using select for update, if the update is in a different transaction, will the lock on the row selected be released when the first transaction ends or when the second one ends? What happens if an error occurs and the first transaction is never closed?
0
Comment
Question by:authenticate
9 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 10661941
Maybe you'd like to address the question i asked at the end of your last one authenticate...?
0
 
LVL 35

Accepted Solution

by:
girionis earned 168 total points
ID: 10662023
A select does not lock the row, only an update or an insert locks it and should be released upon calling commit.

> What happens if an error occurs and the first transaction is never closed?

The transaction will roll back so it will eventually be in it's original state.

0
 
LVL 92

Assisted Solution

by:objects
objects earned 166 total points
ID: 10662030

The tx will end when you end it or roll it back.
0
Why You Should Analyze Threat Actor TTPs

After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

 
LVL 9

Assisted Solution

by:mmuruganandam
mmuruganandam earned 166 total points
ID: 10664679
Whenever you are using the "select for update" that row(s) will be locked.  
Unless that transaction successfully ends/rollbacked, no other transaction can update that row(s).


Regards,
Muruga
0
 
LVL 35

Expert Comment

by:girionis
ID: 10858800
I believe points should be split between all the participants.
0
 
LVL 92

Expert Comment

by:objects
ID: 10864627
split between girionis, objects and mmuruganandam.
0

Featured Post

Better Security Awareness With Threat Intelligence

See how one of the leading financial services organizations uses Recorded Future as part of a holistic threat intelligence program to promote security awareness and proactively and efficiently identify threats.

Join & Write a Comment

Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
This video teaches viewers about errors in exception handling.
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

746 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now