简述信息系统维护的定义和内容。
信息系统维护是为了使得信息系统处于合用状态而采取的一系列措施,目的是纠正错误、改进功能,保证信息系统正常工作。内容包括:程序的维护;数据的维护;代码的维护;设备的维护。
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