操作系统用的进一步理解各种算法的性能，并且进一步理解各种页面替换算法的优缺点。 -operating system with the further understanding of algorithms, and to further understanding of pages replacement algorithm are discussed.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002195s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.085664s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002119s ]
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SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001934s ]
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SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002600s ]
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