May 2007
Intermediate to advanced
610 pages
20h 14m
English
Content preview from Learning WCFBecome 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,
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.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.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.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.
Transactions
Transactions are a critical feature for system reliability. Transactions are necessary when two or more activities must be coordinated as a single operation, ensuring that the system is always left in a consistent state. The only two viable options are to complete all activities successfully or to leave the system as it was before initiating eitheractivity.
The classic acronym to describe a transaction is that it must have ACID properties. ACID stands for the following:
- Atomic
A transaction is an all-or-nothing proposition. Suppose a transaction issues an instruction to insert two database records? The two inserts must be completed as a single, atomic operation that either succeeds or fails.
- Consistent
Transactions never leave the system in an inconsistent state. Suppose one of the inserts is completed and another caller sees the inserted record? If the transaction fails and that insert is reversed, the caller will have seen information that inaccurately represents the system state.
- Isolated
Independent transactions operate separately until they complete their work. Suppose a second transaction attempts to insert to one of the same table records while the first transaction is in progress? The second transaction should be locked out until the first has completed, either successfully or not. There are other levels of isolation, but this strict option yields the best possible result in most cases.
- Durable
No transaction should be lost. Suppose a machine goes down while a transaction ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.