jQuery in Action, 2nd edition*
The moose likes EJB and other Java EE Technologies and the fly likes what is a isolation level,is it  a concept in EJB or a RDBMS concept? Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Murach's Java Servlets and JSP this week in the Servlets forum!
JavaRanch » Java Forums » Java » EJB and other Java EE Technologies
Bookmark "what is a isolation level,is it  a concept in EJB or a RDBMS concept?" Watch "what is a isolation level,is it  a concept in EJB or a RDBMS concept?" New topic
Author

what is a isolation level,is it a concept in EJB or a RDBMS concept?

senthil sen
Ranch Hand

Joined: Oct 10, 2002
Posts: 184
what is an isolation level?
Is it a concept in EJB or a RDBMS concept?
Chris Mathews
Ranch Hand

Joined: Jul 18, 2001
Posts: 2712
Isolation is one of the four properties of ACID Transactions. Both EJB and RDBMS systems are concerned with transactions and therefore isolation levels are found in both.
The isolation level defines how independent a transaction is from other transactions in the system. The isolation level is primarily concerned with zero or more of the following conditions:
  • Dirty Reads
  • Repeatable Reads
  • Phantom Reads


  • EJB allows for four different isolation levels:
  • Read Uncommitted
  • Read Committed - prevents Dirty Reads
  • Repeatable Reads - prevents Dirty Reads and allows Repeatable Reads
  • Serializable - prevents Dirty Reads, allows Repeatable Reads, and prevents Phantom Reads.


  • See any of the numerous books available on EJB for a more in depth description.
    [ January 19, 2003: Message edited by: Chris Mathews ]
     
    I agree. Here's the link: http://aspose.com/file-tools
     
    subject: what is a isolation level,is it a concept in EJB or a RDBMS concept?
     
    Similar Threads
    Database Connections
    EJB Interview Questions
    Isolation levels in a transaction
    Setting BEA Transaction isolation level
    example for isolation-level