| Contents > Developing ColdFusion MX Applications > Using Persistent Data and Locking > About persistent scope variables > ColdFusion persistent variable issues Locking memory variables |
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Because ColdFusion is a multithreaded system in which multiple requests can share Session, Application, and Server scope variables, it is possible for two or more requests to try to access and modify data at the same time. ColdFusion runs in a J2EE environment, which prevents simultaneous data access, so multiple requests do not cause severe system errors. However, such requests can result in inconsistent data values, particularly when a page might change more than one variable.
To prevent data errors with session, application, and server variables, lock code that writes and reads data in these scopes. For more information, see Locking code with cflock.
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| Contents > Developing ColdFusion MX Applications > Using Persistent Data and Locking > About persistent scope variables > ColdFusion persistent variable issues Locking memory variables |
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