Database Isolation Levels

• REPEATABLE READ: Protects against Lost Updates, Dirty Reads, Nonrepeatable Reads, and Phantoms
• READ STABILITY: Protects against Lost Updates, Dirty Reads, and Nonrepeatable Reads. Read stability does not protect against Phantoms.
• CURSOR STABILITY: Protects against Nonrepeatable Reads and Phantoms. Cursor Stability does not protect against Lost Updates and Dirty Reads.
• UNCOMMITED READ: Protects against Lost Updates. Uncommitted Read does not protect against Phantoms, Dirty Reads, and Nonrepeatable Reads.

http://www.developer.com/db/article.php/3706251/Database-Isolation-Levels.htm