what is a isolation level,is it a concept in EJB or a RDBMS concept?
Joined: Oct 10, 2002
what is an isolation level? Is it a concept in EJB or a RDBMS concept?
Joined: Jul 18, 2001
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:
EJB allows for four different isolation levels:
Read Committed - prevents Dirty Reads
Repeatable Reads - prevents Dirty Reads and allows Repeatable Reads