mysql select in 怎么优化

2017年7月10日 22:36:54 星期一

原理: 把select where in 变换成 "where = " 或者 "where between and " 这样的子句, 然后用union all 拼接, 一次查询

CRUD.php::selectIn()

环境(尽量模拟生产环境):

php7,

summerPHP框架,

代码部署在杭州(华东)阿里云的机器上,

mysql数据库部署在青岛(华北),

表的记录数量为8200+,

`id`是主键,`hanzi`不在索引中,要检索物理硬盘

每次id的生成都是随机数, 所以数据比较分散

结果:

用 union all 重新组装的sql查询 总是慢......

思考,

可能是数据太过分散了, 导致生成了很多条子句, 没有太多的利用between and来减少查询, 但数据分散也许符合生产环境的特点吧

也许分布式计算下可以用到这个步骤, 将这些子的sql语句发送到计算集群中并行计算, 而不是在一台机器上计算好后union all

下边是in的数量为10, 50, 100, 200, 300的计算结果

有此优化想法的同学可以绕道了, 或者我这里有哪里不对的地方也请指出来, 让我哭一会儿先.....

测试代码:

//随机数数组
$rand = [];
for ($i=0; $i<100; $i++) {
$rand[] = mt_rand(1,8200);
}

$rs = Test::link('pinyin')->fields('id,hanzi')
->whereIn('id', $rand)
->select()//不改写select in
->getAll();
echo Test::$sql,'<br>'; //打印出当前sql语句

$rs = Test::link('pinyin')->fields('id,hanzi')
->whereIn('id', $rand)
->selectIn() //改写select in
->getAll();

echo Test::$sql,'<br>'; //打印当前的sql语句

print_r(Timer::$list); //输出耗时统计

1. in的数量在10以下的时候, 直接in快一点

2. in的数量是50, union all 总是稍慢

[5] => Array
(
[key] => SELECT id,hanzi FROM pinyin WHERE (id IN ( 57,62,67,80,89,99,122,188,258,344,377,389,401,435,497,521,531,578,582,585,613,627,649,697,720,783,785,806,817,822,870,883,905,927,957,966,998,1066,1069,1073,1091,1135,1169,1177,1214,1304,1310,1314,1328,1350,1400,1450,1475,1502,1516,1579,1669,1684,1688,1804,1832,1936,2022,2066,2091,2172,2214,2237,2242,2257,2259,2265,2268,2294,2296,2297,2362,2369,2384,2393,2419,2426,2521,2572,2595,2608,2730,2759,2778,2805,2839,2842,2867,2905,2909,2916,2930,2985,3001,3120,3158,3188,3196,3210,3261,3280,3310,3317,3323,3353,3371,3384,3436,3462,3481,3486,3504,3551,3565,3592,3677,3705,3728,3746,3755,3767,3787,3806,3878,3911,3977,4012,4020,4035,4072,4084,4211,4218,4231,4254,4283,4288,4309,4316,4338,4392,4396,4413,4511,4523,4529,4548,4553,4582,4686,4701,4747,4758,4780,4804,4851,4860,4913,4922,5004,5087,5144,5160,5175,5235,5264,5358,5414,5416,5439,5449,5527,5552,5576,5616,5624,5637,5640,5663,5685,5718,5762,5763,5772,5860,5875,5880,5909,5918,5923,5952,5961,6005,6048,6075,6085,6176,6183,6327,6347,6375,6428,6447,6498,6545,6575,6582,6586,6588,6592,6620,6635,6644,6650,6710,6747,6795,6796,6810,6821,6823,6873,6918,6932,6943,6955,6958,6959,6968,6973,6990,7061,7081,7123,7154,7179,7183,7188,7211,7220,7231,7236,7250,7471,7564,7569,7572,7581,7607,7642,7645,7688,7701,7709,7721,7724,7729,7748,7776,7782,7788,7803,7850,7893,7913,7936,7942,7944,7945,7971,7974,7987,8006,8013,8015,8040,8060,8063,8072,8076,8128,8138,8151,8167,8176,8198 ))
[start] => 1499698048.6471
[over] => 1499698048.6715
[cost] => 0.0244
)

[6] => Array
(
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[cost] => 0.0584
)

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summerPHP