超详细的PID参数调整讲解，整理了多个版本，方便比较加深理解-Ultra-detailed adjust PID parameters on, organize a number of versions of a deeper understanding to facilitate comparison
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001767s ]
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:0.105372s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001029s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000952s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003078s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000744s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003507s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.019606s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001333s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 130022 [ RunTime:0.013731s ]
