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JAVA 2PL Protocol
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1. & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; randomly generate several (n) concurrent transactions, and each transaction is the following operation sequence t = {begin transaction} R (x1) w (x1, val1) r (x2) w (X2, val2) {commit}。 Where val1, Val
caboboca 0 0
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Java memory and external sorting sorting
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10,000,000 records have generated a text file in which each record consists of 100 bytes. Experiments considering only one attribute A record, assume that A is an integer type. Recorded on the block package, using non-spanned manner that the recording block is smaller than a space not used. Block size is available on its own operating system to view, xp usually 4096 bytes. 50M bytes of memory space allocated for external merge-sort.
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Graphics grayscale processing
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Photo by color is converted to grayscale by "average method", "sensitivity Law," "direct method" to
achieve using the "Save", "page", "next page" and other buttons to control the image conversion,
preservation and Browse.
caboboca 1 0
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