Informix Guide to SQL: Tutorial
Chapter 7: Programming for a Multiuser Environment
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If your database is contained in a single-user workstation and is not connected on a network to other computers, your programs can modify data freely. But in all other cases, you must allow for the possibility that, while your program is modifying data, another program is reading or modifying the same data. This situation describes
concurrency
: two or more independent uses of the same data at the same time. This chapter addresses concurrency, locking, and isolation levels.
Informix Guide to SQL: Tutorial
, version 9.1
Copyright © 1998, Informix Software, Inc. All rights reserved.
