March 2012
Intermediate to advanced
442 pages
9h 31m
English
Content preview from IBM DB2 9.7 Advanced Application Developer CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Improving concurrency by using enhanced optimistic locking
When a record is selected for updating a table, a lock is acquired. This lock will be released only when the transaction ends. When this lock is acquired by a transaction, no other transaction can update or delete this record. In other words, the second transaction assumes that the first transaction may update the record and hence it waits until the lock is released. This is also known as pessimistic locking. The biggest downside of this type of locking is reduced concurrency.
To overcome such situations, optimistic locking has been introduced. Optimistic locking provides techniques that do not require locks to be held between selecting and updating/deleting the records. When optimistic ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.