存储管理请求分页置换算法 用到的先进先出FIFO、最近最久未使用LRU、最佳OPT置换算法。熟悉文件的基本操作（读、写）。-Replacement algorithm for storage management, demand paging used FIFO FIFO, the most recent long-lost the use of LRU, the best OPT replacement algorithm. Are familiar with the basic file operations (read, write).
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001089s ]
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:0.070061s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001031s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001288s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001056s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003053s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000850s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003724s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015066s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001437s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 208509 [ RunTime:0.024766s ]
