<html> <head> <title>Optimistic Locking</title> </head> <body text=#FFFFFF bgcolor=#000080 link=#000080 vlink=#800000 alink=#000080> <center> <a href="text0.htm">First page</a> <a href="text28.htm">Back</a> <a href="text30.htm">Continue</a> <a href="text41.htm">Last page</a> <a href="img29.htm">Graphic</a></center><br> <h1><b>Optimistic Locking</b></h1><p> <ul><li><h2><b>Efficient</b></h2> <ul><li>Reduces lock contention <li>Allows concurrent access from multiple tx </ul><li><h2><b>When to use</b></h2> <ul><li>Concurrent access is rare or mostly read only <li>Conflicting changes are rare </ul><li><h2><b>Dirty checking</b></h2> <ul><li>Detects conflicting changes, including direct database access </ul></ul></body> </html>
