Sign In

Communications of the ACM

Practice

Online Event Processing


storage shelves

Credit: Getty Images

back to top 

For almost half a century, ACID transactions (satisfying the properties of atomicity, consistency, isolation, and durability) have been the abstraction of choice for ensuring consistency in data-storage systems. The well-known atomicity property ensures that either all or none of a transaction's writes take effect in the case of a failure; isolation prevents interference from concurrently running transactions; and durability ensures that writes made by committed transactions are not lost in the case of a failure.

While transactions work well within the scope of a single database product, transactions that span several different data-storage products from distinct vendors have been problematic: many storage systems do not support them, and those that do often perform poorly. Today, large-scale applications are often implemented by combining several distinct data-storage technologies that are optimized for different access patterns. Distributed transactions have failed to gain adoption in most such settings, and most large-scale applications instead rely on ad hoc, unreliable approaches for maintaining the consistency of their data systems.


 

No entries found

Log in to Read the Full Article

Sign In

Sign in using your ACM Web Account username and password to access premium content if you are an ACM member, Communications subscriber or Digital Library subscriber.

Need Access?

Please select one of the options below for access to premium content and features.

Create a Web Account

If you are already an ACM member, Communications subscriber, or Digital Library subscriber, please set up a web account to access premium content on this site.

Join the ACM

Become a member to take full advantage of ACM's outstanding computing information resources, networking opportunities, and other benefits.
  

Subscribe to Communications of the ACM Magazine

Get full access to 50+ years of CACM content and receive the print version of the magazine monthly.

Purchase the Article

Non-members can purchase this article or a copy of the magazine in which it appears.