Informix Guide to SQL: Tutorial

Informix Guide to SQL: Tutorial
Chapter 7: Programming for a Multiuser Environment

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Summary

Whenever multiple programs have access to a database concurrently (and when at least one of them can modify data), all programs must allow for the possibility that another program can change the data even as they read it. The database server provides a mechanism of locks and isolation levels that usually allows programs to run as if they were alone with the data.

Informix Guide to SQL: Tutorial, version 9.1
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