IT博客汇
  • 首页
  • 精华
  • 技术
  • 设计
  • 资讯
  • 扯淡
  • 权利声明
    • 登录 注册

    [原]MySQL 使用profile分析慢sql，group left join效率高于子查询

    mchdba发表于 2017-01-12 17:44:06
    love 0

    使用profile来分析慢sql

    有一个查询比较慢的sql语句，用了子查询，大概需要0.8秒左右，这个消耗时间比较长，严重影响了性能，所以需要进行优化。单独查询单表或者子查询记录都很快，

    开启profile

    mysql> show profiles; -- 查看是否开启
Empty set, 1 warning (0.00 sec)

mysql> set profiling=1; -- 开启profile
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> show profiles;
Empty set, 1 warning (0.00 sec)

mysql>

    执行查询，方便profile跟踪记录

    mysql> SELECT SQL_NO_CACHE
    ->                 t1.amount,
    ->                 t1.count,
    ->                 t1.date ,
    ->                  (SELECT (CONCAT(t2.APPROVE_ID,'|' ,t2.PATH)) AS RECEIPT FROM TB_BIS_MERCHANT_SETTLEMENT t2 WHERE t2.`MERCHANT_ID` = t1.`MERCHANT_ID` AND t2.`DATE`=t1.DATE AND t2.APPROVE_STATUS=5) AS receipts
    ->             FROM
    ->                 TB_BIS_MERCHANT_TURNOVER t1
    ->             WHERE t1.MERCHANT_ID='64884DE062BC11E682B00017FA000202'
    ->                                 ORDER BY t1.date DESC
    -> 
    ->  LIMIT 0,100;
+-----------+-------+----------+------------------------------------------------------------------------------------------------------------+
| amount    | count | date     | receipts                                                                                                   |
+-----------+-------+----------+------------------------------------------------------------------------------------------------------------+
|  15800.00 |     1 | 20170105 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/49/CvkBIlhu-yqABqmAABYR7dHOmno819.jpg |
|   1245.00 |     1 | 20170104 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/4F/CvkBIVhtpSeAI_YHAADNjq7TPq8244.jpg |
|  14766.00 |     4 | 20170103 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/45/CvkBIlhrrf6AQ5uIAAEobJv68FU398.jpg |
|  32449.00 |     2 | 20170102 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/4C/CvkBIVhrDguAfaMIABjKB9uvu04477.jpg |
|  37246.00 |     5 | 20170101 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/4A/CvkBIVhpCnGASEyLAAEu6l9SI0o812.jpg |
| 105094.00 |     2 | 20161231 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/49/CvkBIVhnwp-ALIvWAAEAaGPayjg732.jpg |
|  88032.00 |     3 | 20161230 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/47/CvkBIVhmaqSAHcEZAAFAyS8Zx8Q067.jpg |
|   3845.00 |     1 | 20161229 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/3F/CvkBIlhl206AaS-FAAFMhvX8PYY578.jpg |
|   2118.00 |     4 | 20161228 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/3D/CvkBIlhjxhyAMOfhAAD8wUzTUUY855.jpg |
|   2980.00 |     1 | 20161227 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/3B/CvkBIlhicfCAFmwgAAE9ULPqEJ4030.jpg |
|   1080.00 |     1 | 20161226 | 667E240C44B4469892C261CE9243A8C3|http://testxxx.cn/group1/M00/00/42/CvkBIVhhy6iAMm8tAAFHOT5zBiM875.jpg |
|   2980.00 |     1 | 20161225 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/40/CvkBIVhfzCWAdw2LAAFpDXmwio4327.jpg |
|  10201.00 |     1 | 20161224 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/38/CvkBIlhfJfKAIoBiAADqgbF1pBo054.jpg |
|   3003.00 |     4 | 20161223 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/3D/CvkBIVhdMHeAQi8cAAGAOQTgxLo422.jpg |
|   2698.00 |     1 | 20161222 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/3C/CvkBIVhb2U2AXWRuAAEc4LIr2nc172.jpg |
|    990.00 |     1 | 20161221 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/3B/CvkBIVhbM6aAGMQAAAEQ9ptn0FU333.jpg |
|   1427.00 |     1 | 20161220 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/31/CvkBIlhZNJqAAsvWAAGuJ6g1pyU541.jpg |
|   2465.00 |     1 | 20161219 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/30/CvkBIlhX4_mAfn-SAAEptH1Fyp8152.jpg |
|   2360.00 |     1 | 20161218 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/2F/CvkBIlhWl_-AclhbAAGLv79hoh8428.jpg |
|   3998.00 |     1 | 20161217 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/35/CvkBIVhVSLGAFct_AAFQRetyWnc285.jpg |
|      0.00 |     0 | 20161216 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/2D/CvkBIlhU8g-AXywcAAGn1gdsQQc959.jpg |
|      0.00 |     0 | 20161215 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/2A/CvkBIlhSmryAZXITAG-zN3WQv4c789.jpg |
|   9900.00 |     1 | 20161214 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/31/CvkBIVhRTrOALwG6AAE_csC3lvk695.jpg |
|   4320.00 |     1 | 20161213 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/28/CvkBIlhQrzCAfApEAAFKbHqkH3w634.jpg |
|   8760.00 |     2 | 20161212 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/26/CvkBIlhOqjeAO1BdAAGHdajOU2E697.jpg |
| 213335.00 |     4 | 20161211 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/2D/CvkBIVhNYQSAfxXgAAHZL9a8Nrs596.jpg |
|  47104.00 |     5 | 20161210 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/2C/CvkBIVhMsPSAAnrAAAETxX9fCuw946.jpg |
|   6100.00 |     1 | 20161209 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/23/CvkBIlhLfXOAClJVAAFmuoqBI5o264.jpg |
|  13515.00 |     2 | 20161208 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/21/CvkBIlhJZ06AbuaNAAGg7Bz3OsA569.jpg |
|  26769.00 |     4 | 20161207 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/20/CvkBIlhIGgeAdNxuAAETxX9fCuw408.jpg |
|      0.00 |     0 | 20161206 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/1E/CvkBIlhGxAuAfQr8AAFatVZ2sFk337.jpg |
|      0.00 |     0 | 20161205 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/1D/CvkBIlhGKy-AU9guAAGm4jFhmoU601.jpg |
|  20000.00 |     3 | 20161204 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/23/CvkBIVhEIDGAMPuIAAH6chL6Wo8684.jpg |
|  20275.00 |     4 | 20161203 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/21/CvkBIVhCyrSAE-uGAAGf0CWFbZM991.jpg |
|   3988.00 |     1 | 20161202 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/19/CvkBIlhCI7mAUN_9AAIsSLMhcns351.jpg |
|   4460.00 |     1 | 20161201 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/17/CvkBIlhAKwmACroNAAGpJUqVqIA247.jpg |
|  10498.00 |     2 | 20161130 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/16/CvkBIlg-3euAbsd5AAGr-r7GCH0254.jpg |
|  11080.00 |     2 | 20161129 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/1C/CvkBIVg9i6WAD4Z0AAHLB1yISaQ864.jpg |
|   6100.00 |     1 | 20161128 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/1B/CvkBIVg8OHGABTZOAAG1ZWoLoXY932.jpg |
|   5580.00 |     1 | 20161127 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/19/CvkBIVg65aKAcRWWAAFnaqaodKs660.jpg |
|  32630.00 |     2 | 20161126 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/18/CvkBIVg5kveALns0AAHLB1yISaQ850.jpg |
|   9800.00 |     1 | 20161125 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/17/CvkBIVg4Qg2AMqoNAAH--He3hsg726.jpg |
|  32500.00 |     2 | 20161124 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/16/CvkBIVg27_OAAV5OAAE8vRiZWHs684.jpg |
|   2700.00 |     1 | 20161123 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/0E/CvkBIlg2T4OAL3t5AAFsAWaUI98731.jpg |
|   4580.00 |     1 | 20161122 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/14/CvkBIVg0-UeAFDr_AAIBY_LNIxs656.jpg |
|  14120.00 |     1 | 20161121 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/0B/CvkBIlgy_EeAaPdBAAHeyO5nxeo952.jpg |
|  41510.00 |     2 | 20161120 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/12/CvkBIVgyYRKAZKi3AAGEp_IGjVM389.jpg |
|   7800.00 |     2 | 20161118 | C91D5E7905BA44C8A14045C9C228157F|http://testxxx.cn/group1/M00/00/09/CvkBIlgw_viAFHiPAAH0MZwoiCE530.jpg |
+-----------+-------+----------+------------------------------------------------------------------------------------------------------------+
48 rows in set (0.75 sec)

mysql>

    查看当前的profile记录，主要获得Query_ID值

    mysql> show profiles;
+----------+------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Query_ID | Duration   | Query                                                                                                                                                                                                                                                                                                        |
+----------+------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|        1 | 0.00009250 | show warning                                                                                                                                                                                                                                                                                                 |
|        2 | 0.00013125 | show warnings                                                                                                                                                                                                                                                                                                |
|        3 | 0.00014375 | set profiling=1                                                                                                                                                                                                                                                                                              |
|        4 | 0.75458525 | SELECT SQL_NO_CACHE
                t1.amount,
                t1.count,
                t1.date ,
                 (SELECT (CONCAT(t2.APPROVE_ID,'|' ,t2.PATH)) AS RECEIPT FROM TB_BIS_MERCHANT_SETTLEMENT t2 WHERE t2.`MERCHANT_ID` = t1.`MERCHANT_ID` AND t2.`DATE`=t1.DATE AND t2.APPROVE_STATUS=5) AS r |
+----------+------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
4 rows in set, 1 warning (0.00 sec)

mysql>

    查看刚才执行的Query_ID为4的跟踪记录

    mysql> show profile for query 4;
+--------------------+----------+
| Status             | Duration |
+--------------------+----------+
| executing          | 0.000017 |
| Sending data       | 0.018048 |
| executing          | 0.000028 |
| Sending data       | 0.018125 |
| executing          | 0.000022 |
| Sending data       | 0.015749 |
| executing          | 0.000017 |
| Sending data       | 0.015633 |
| executing          | 0.000017 |
| Sending data       | 0.015382 |
| executing          | 0.000015 |
| Sending data       | 0.015707 |
| executing          | 0.000023 |
| Sending data       | 0.015890 |
| executing          | 0.000022 |
| Sending data       | 0.015908 |
| executing          | 0.000017 |
| Sending data       | 0.015761 |
| executing          | 0.000022 |
| Sending data       | 0.015542 |
| executing          | 0.000014 |
| Sending data       | 0.015561 |
| executing          | 0.000016 |
| Sending data       | 0.015546 |
| executing          | 0.000037 |
| Sending data       | 0.015555 |
| executing          | 0.000015 |
| Sending data       | 0.015779 |
| executing          | 0.000026 |
| Sending data       | 0.015815 |
| executing          | 0.000015 |
| Sending data       | 0.015468 |
| executing          | 0.000015 |
| Sending data       | 0.015457 |
| executing          | 0.000015 |
| Sending data       | 0.015457 |
| executing          | 0.000014 |
| Sending data       | 0.015500 |
| executing          | 0.000014 |
| Sending data       | 0.015557 |
| executing          | 0.000015 |
| Sending data       | 0.015537 |
| executing          | 0.000014 |
| Sending data       | 0.015395 |
| executing          | 0.000021 |
| Sending data       | 0.015416 |
| executing          | 0.000014 |
| Sending data       | 0.015416 |
| executing          | 0.000014 |
| Sending data       | 0.015399 |
| executing          | 0.000023 |
| Sending data       | 0.015407 |
| executing          | 0.000014 |
| Sending data       | 0.015585 |
| executing          | 0.000014 |
| Sending data       | 0.015385 |
| executing          | 0.000014 |
| Sending data       | 0.015412 |
| executing          | 0.000014 |
| Sending data       | 0.015408 |
| executing          | 0.000014 |
| Sending data       | 0.015753 |
| executing          | 0.000014 |
| Sending data       | 0.015376 |
| executing          | 0.000014 |
| Sending data       | 0.015416 |
| executing          | 0.000019 |
| Sending data       | 0.015368 |
| executing          | 0.000014 |
| Sending data       | 0.015481 |
| executing          | 0.000015 |
| Sending data       | 0.015619 |
| executing          | 0.000015 |
| Sending data       | 0.015662 |
| executing          | 0.000016 |
| Sending data       | 0.015574 |
| executing          | 0.000015 |
| Sending data       | 0.015566 |
| executing          | 0.000015 |
| Sending data       | 0.015488 |
| executing          | 0.000013 |
| Sending data       | 0.015493 |
| executing          | 0.000015 |
| Sending data       | 0.015386 |
| executing          | 0.000015 |
| Sending data       | 0.015485 |
| executing          | 0.000018 |
| Sending data       | 0.015760 |
| executing          | 0.000014 |
| Sending data       | 0.015386 |
| executing          | 0.000015 |
| Sending data       | 0.015418 |
| executing          | 0.000014 |
| Sending data       | 0.015458 |
| end                | 0.000016 |
| query end          | 0.000019 |
| closing tables     | 0.000018 |
| freeing items      | 0.000825 |
| logging slow query | 0.000067 |
| cleaning up        | 0.000025 |
+--------------------+----------+
100 rows in set, 1 warning (0.00 sec)

mysql>

    根据分析结果可以看到，有大量的Sending data消耗，而且是持续不断的，这样的可以判断为子查询导致的，所以在这个case里面，子查询不适合用，效率太低。 那该用什么来避免呢？

    用group by + left join 改写

    mysql> SELECT SQL_NO_CACHE DISTINCT
    ->                 t1.amount,
    ->                 t1.count,
    ->                 t1.date, GROUP_CONCAT(CONCAT(t2.APPROVE_ID,'|' ,t2.PATH)) AS RECEIPT 
    ->             FROM
    ->                 TB_BIS_MERCHANT_TURNOVER t1 LEFT JOIN TB_BIS_MERCHANT_SETTLEMENT t2  ON t2.`MERCHANT_ID` = t1.`MERCHANT_ID` AND t2.`DATE`=t1.DATE AND t2.APPROVE_STATUS=5
    ->             WHERE t1.MERCHANT_ID='64884DE062BC11E682B00017FA000202'
    ->             GROUP BY t1.amount,
    ->                 t1.count,
    ->                 t1.date
    ->                                 ORDER BY t1.date DESC
    -> 
    ->  LIMIT 0,100;
+-----------+-------+----------+------------------------------------------------------------------------------------------------------------+
| amount    | count | date     | RECEIPT                                                                                                    |
+-----------+-------+----------+------------------------------------------------------------------------------------------------------------+
|  15800.00 |     1 | 20170105 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/49/CvkBIlhu-yqABqmAABYR7dHOmno819.jpg |
|   1245.00 |     1 | 20170104 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/4F/CvkBIVhtpSeAI_YHAADNjq7TPq8244.jpg |
|  14766.00 |     4 | 20170103 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/45/CvkBIlhrrf6AQ5uIAAEobJv68FU398.jpg |
|  32449.00 |     2 | 20170102 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/4C/CvkBIVhrDguAfaMIABjKB9uvu04477.jpg |
|  37246.00 |     5 | 20170101 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/4A/CvkBIVhpCnGASEyLAAEu6l9SI0o812.jpg |
| 105094.00 |     2 | 20161231 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/49/CvkBIVhnwp-ALIvWAAEAaGPayjg732.jpg |
|  88032.00 |     3 | 20161230 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/47/CvkBIVhmaqSAHcEZAAFAyS8Zx8Q067.jpg |
|   3845.00 |     1 | 20161229 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/3F/CvkBIlhl206AaS-FAAFMhvX8PYY578.jpg |
|   2118.00 |     4 | 20161228 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/3D/CvkBIlhjxhyAMOfhAAD8wUzTUUY855.jpg |
|   2980.00 |     1 | 20161227 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/3B/CvkBIlhicfCAFmwgAAE9ULPqEJ4030.jpg |
|   1080.00 |     1 | 20161226 | 667E240C44B4469892C261CE9243A8C3|http://testxxx.cn/group1/M00/00/42/CvkBIVhhy6iAMm8tAAFHOT5zBiM875.jpg |
|   2980.00 |     1 | 20161225 | 0DDFD555F93B45BEB0905B1E6DE89D29|http://testxxx.cn/group1/M00/00/40/CvkBIVhfzCWAdw2LAAFpDXmwio4327.jpg |
|  10201.00 |     1 | 20161224 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/38/CvkBIlhfJfKAIoBiAADqgbF1pBo054.jpg |
|   3003.00 |     4 | 20161223 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/3D/CvkBIVhdMHeAQi8cAAGAOQTgxLo422.jpg |
|   2698.00 |     1 | 20161222 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/3C/CvkBIVhb2U2AXWRuAAEc4LIr2nc172.jpg |
|    990.00 |     1 | 20161221 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/3B/CvkBIVhbM6aAGMQAAAEQ9ptn0FU333.jpg |
|   1427.00 |     1 | 20161220 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/31/CvkBIlhZNJqAAsvWAAGuJ6g1pyU541.jpg |
|   2465.00 |     1 | 20161219 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/30/CvkBIlhX4_mAfn-SAAEptH1Fyp8152.jpg |
|   2360.00 |     1 | 20161218 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/2F/CvkBIlhWl_-AclhbAAGLv79hoh8428.jpg |
|   3998.00 |     1 | 20161217 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/35/CvkBIVhVSLGAFct_AAFQRetyWnc285.jpg |
|      0.00 |     0 | 20161216 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/2D/CvkBIlhU8g-AXywcAAGn1gdsQQc959.jpg |
|      0.00 |     0 | 20161215 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/2A/CvkBIlhSmryAZXITAG-zN3WQv4c789.jpg |
|   9900.00 |     1 | 20161214 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/31/CvkBIVhRTrOALwG6AAE_csC3lvk695.jpg |
|   4320.00 |     1 | 20161213 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/28/CvkBIlhQrzCAfApEAAFKbHqkH3w634.jpg |
|   8760.00 |     2 | 20161212 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/26/CvkBIlhOqjeAO1BdAAGHdajOU2E697.jpg |
| 213335.00 |     4 | 20161211 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/2D/CvkBIVhNYQSAfxXgAAHZL9a8Nrs596.jpg |
|  47104.00 |     5 | 20161210 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/2C/CvkBIVhMsPSAAnrAAAETxX9fCuw946.jpg |
|   6100.00 |     1 | 20161209 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/23/CvkBIlhLfXOAClJVAAFmuoqBI5o264.jpg |
|  13515.00 |     2 | 20161208 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/21/CvkBIlhJZ06AbuaNAAGg7Bz3OsA569.jpg |
|  26769.00 |     4 | 20161207 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/20/CvkBIlhIGgeAdNxuAAETxX9fCuw408.jpg |
|      0.00 |     0 | 20161206 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/1E/CvkBIlhGxAuAfQr8AAFatVZ2sFk337.jpg |
|      0.00 |     0 | 20161205 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/1D/CvkBIlhGKy-AU9guAAGm4jFhmoU601.jpg |
|  20000.00 |     3 | 20161204 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/23/CvkBIVhEIDGAMPuIAAH6chL6Wo8684.jpg |
|  20275.00 |     4 | 20161203 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/21/CvkBIVhCyrSAE-uGAAGf0CWFbZM991.jpg |
|   3988.00 |     1 | 20161202 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/19/CvkBIlhCI7mAUN_9AAIsSLMhcns351.jpg |
|   4460.00 |     1 | 20161201 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/17/CvkBIlhAKwmACroNAAGpJUqVqIA247.jpg |
|  10498.00 |     2 | 20161130 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/16/CvkBIlg-3euAbsd5AAGr-r7GCH0254.jpg |
|  11080.00 |     2 | 20161129 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/1C/CvkBIVg9i6WAD4Z0AAHLB1yISaQ864.jpg |
|   6100.00 |     1 | 20161128 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/1B/CvkBIVg8OHGABTZOAAG1ZWoLoXY932.jpg |
|   5580.00 |     1 | 20161127 | 98FDB31FE4B04C21BC7EBE8A22981DA0|http://testxxx.cn/group1/M00/00/19/CvkBIVg65aKAcRWWAAFnaqaodKs660.jpg |
|  32630.00 |     2 | 20161126 | 2154FDCDA51A4257811F1EA886AACD14|http://testxxx.cn/group1/M00/00/18/CvkBIVg5kveALns0AAHLB1yISaQ850.jpg |
|   9800.00 |     1 | 20161125 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/17/CvkBIVg4Qg2AMqoNAAH--He3hsg726.jpg |
|  32500.00 |     2 | 20161124 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/16/CvkBIVg27_OAAV5OAAE8vRiZWHs684.jpg |
|   2700.00 |     1 | 20161123 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/0E/CvkBIlg2T4OAL3t5AAFsAWaUI98731.jpg |
|   4580.00 |     1 | 20161122 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/14/CvkBIVg0-UeAFDr_AAIBY_LNIxs656.jpg |
|  14120.00 |     1 | 20161121 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/0B/CvkBIlgy_EeAaPdBAAHeyO5nxeo952.jpg |
|  41510.00 |     2 | 20161120 | EC481757CFDB445092D16D6B616350C8|http://testxxx.cn/group1/M00/00/12/CvkBIVgyYRKAZKi3AAGEp_IGjVM389.jpg |
|   7800.00 |     2 | 20161118 | C91D5E7905BA44C8A14045C9C228157F|http://testxxx.cn/group1/M00/00/09/CvkBIlgw_viAFHiPAAH0MZwoiCE530.jpg |
+-----------+-------+----------+------------------------------------------------------------------------------------------------------------+
48 rows in set (0.15 sec)

mysql>

    可以看到，执行时间变成了0.15秒，提升了5倍的效率。再看profile的跟踪分析。

    mysql> show profile for query 8;
+-------------------------------+----------+
| Status                        | Duration |
+-------------------------------+----------+
| starting                      | 0.000125 |
| checking permissions          | 0.000015 |
| checking permissions          | 0.000014 |
| Opening tables                | 0.000029 |
| init                          | 0.000055 |
| System lock                   | 0.000020 |
| Waiting for query cache lock  | 0.000013 |
| System lock                   | 0.000050 |
| optimizing                    | 0.000023 |
| statistics                    | 0.000087 |
| preparing                     | 0.000066 |
| Creating tmp table            | 0.000062 |
| Creating tmp table            | 0.000028 |
| Sorting result                | 0.000016 |
| executing                     | 0.000012 |
| Sending data                  | 0.148283 |
| Creating sort index           | 0.000342 |
| Creating sort index           | 0.000223 |
| end                           | 0.000015 |
| query end                     | 0.000046 |
| removing tmp table            | 0.000017 |
| query end                     | 0.000012 |
| removing tmp table            | 0.000062 |
| query end                     | 0.000015 |
| closing tables                | 0.000017 |
| freeing items                 | 0.000019 |
| removing tmp table            | 0.000025 |
| freeing items                 | 0.000016 |
| Waiting for query cache lock  | 0.000012 |
| freeing items                 | 0.000915 |
| Waiting for query cache lock  | 0.000015 |
| freeing items                 | 0.000011 |
| storing result in query cache | 0.000013 |
| cleaning up                   | 0.000024 |
+-------------------------------+----------+
34 rows in set, 1 warning (0.00 sec)

mysql>

    可以看到，只有一次| Sending data | 0.148283 |的消耗，所以效率提升很快。



沪ICP备19023445号-2号
友情链接