我用stata12.1，出现这个op. sys. refuses to provide memory。该如何处理？问了连老师，用这个命令set memory 500m，结果出现了set memory ignored.
    Memory no longer needs to be set in modern Statas; memory adjustments are
    performed on the fly automatically.怎么办呢？请将答案发到我邮箱，sunshine583@126.com