問題描述
我有一個實時服務器和我的開發服務器，我發現我的 LIVE(不是開發)服務器上的查詢運行速度慢了 10 倍，即使實時服務器更強大，而且它們都是運行可比負載.這不是數據庫結構的事情，因為我將備份從實時服務器加載到我的開發服務器中.
有人對我可以在哪里查找差異有任何想法嗎?它可能是一個 MySQL 配置的東西嗎?我應該從哪里開始尋找?
實時服務器:
<前>mysql> SELECT count(`Transaction`.`id`) 作為count, sum(`Transaction`.`amount`) 作為sum, sum(Transaction.citiq_margin+rounding + Transaction.citiq_margin_vat) 作為收入來自`transactions` AS `Transaction` LEFT JOIN `meters` AS `Meter` ON (`Transaction`.`meter_id` = `Meter`.`id`) LEFT JOIN `units` AS `Unit` ON (`Meter`.`unit_id` = `Unit`.`id`) WHERE (NOT (`Unit`.`building_id` IN ('1', '85')) AND NOT (`Transaction`.`state` >= 90)) AND DAY(`Transaction`.`created`) = DAY(NOW()) AND YEAR(`Transaction`.`created`) = YEAR(NOW()) AND (MONTH(`Transaction`.`created`)) = MONTH(NOW());+-------+---------+---------+|計數 |總和 |收入|+-------+---------+---------+|第413話3638550 |409210 |+-------+---------+---------+1 排(2.62 秒)[root@mises ~]# 正常運行時間17:11:57 55 天，1 分鐘，1 個用戶，平均負載:0.45、0.56、0.60開發服務器(由于備份有輕微的時間延遲，結果計數不同):
<前>mysql> SELECT count(`Transaction`.`id`) 作為count, sum(`Transaction`.`amount`) 作為sum, sum(Transaction.citiq_margin+rounding + Transaction.citiq_margin_vat) 作為收入來自`transactions` AS `Transaction` LEFT JOIN `meters` AS `Meter` ON (`Transaction`.`meter_id` = `Meter`.`id`) LEFT JOIN `units` AS `Unit` ON (`Meter`.`unit_id` = `Unit`.`id`) WHERE (NOT (`Unit`.`building_id` IN ('1', '85')) AND NOT (`Transaction`.`state` >= 90)) AND DAY(`Transaction`.`created`) = DAY(NOW()) AND YEAR(`Transaction`.`created`) = YEAR(NOW()) AND (MONTH(`Transaction`.`created`)) = MONTH(NOW());+-------+---------+---------+|計數 |總和 |收入|+-------+---------+---------+|第357話3005550 |338306 |+-------+---------+---------+1 排(0.22 秒)[www@smith 測試]$ 正常運行時間18:11:53 up 12 days, 1:57, 4 users, load average: 0.91, 0.75, 0.62實時服務器(2 個至強四核):
<前>處理器:7vendor_id : 正版英特爾CPU系列:6型號 : 44型號名稱 : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz踏步:2CPU 兆赫:2395.000緩存大小:12288 KB物理 ID:0兄弟姐妹:8核心編號:10CPU核心:4開發服務器(1 個四核)
<前>處理器:3vendor_id : 正版英特爾CPU系列:6型號 : 23型號名稱 : Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz步數:10微碼:0xa07CPU 兆赫:1998.000緩存大小:2048 KB物理 ID:0兄弟姐妹:4核心編號:3CPU核心:4實時服務器:
- CentOS 5.7
- MySQL 5.0.95 版
開發服務器:
- ArchLinux
- MySQL 5.5.25a 版
因此，我在運行 Centos、1 個 CPU 和 512MB 內存的虛擬機上運行相同的數據庫和查詢:它在 0.3 秒內提供了該查詢的答案;系統負載為 0.4 :/
唯一真正的區別似乎是我在該服務器上運行 Mysql 5.5.在我的案例中，從 Mysql 5.0 到 Mysql 5.5，似乎真的性能提高了 10 倍.
我只有在將實時服務器從 Mysql 5.0 遷移到 Mysql 5.5 后才能確定，一旦完成，我將確認結果.
I have a live server and my dev server, and I am finding that queries on my LIVE (not dev) server run 10x slower, even though the live server is more powerful and they are both running comparable load. It's not a database structure thing because I load the backup from the live server into my dev server.
Does anybody have any ideas on where I could look for the discrepancy? Could it be a MySQL config thing? Where should I start looking?
Live Server:
mysql> SELECT count(`Transaction`.`id`) as count, sum(`Transaction`.`amount`) as sum, sum(Transaction.citiq_margin+rounding + Transaction.citiq_margin_vat) as revenue FROM `transactions` AS `Transaction` LEFT JOIN `meters` AS `Meter` ON (`Transaction`.`meter_id` = `Meter`.`id`) LEFT JOIN `units` AS `Unit` ON (`Meter`.`unit_id` = `Unit`.`id`) WHERE (NOT (`Unit`.`building_id` IN ('1', '85')) AND NOT (`Transaction`.`state` >= 90)) AND DAY(`Transaction`.`created`) = DAY(NOW()) AND YEAR(`Transaction`.`created`) = YEAR(NOW()) AND (MONTH(`Transaction`.`created`)) = MONTH(NOW());
+-------+---------+---------+
| count | sum | revenue |
+-------+---------+---------+
| 413 | 3638550 | 409210 |
+-------+---------+---------+
1 row in set (2.62 sec)
[root@mises ~]# uptime
17:11:57 up 55 days, 1 min, 1 user, load average: 0.45, 0.56, 0.60
Dev Server (result count is different because of slight time delay from backup):
mysql> SELECT count(`Transaction`.`id`) as count, sum(`Transaction`.`amount`) as sum, sum(Transaction.citiq_margin+rounding + Transaction.citiq_margin_vat) as revenue FROM `transactions` AS `Transaction` LEFT JOIN `meters` AS `Meter` ON (`Transaction`.`meter_id` = `Meter`.`id`) LEFT JOIN `units` AS `Unit` ON (`Meter`.`unit_id` = `Unit`.`id`) WHERE (NOT (`Unit`.`building_id` IN ('1', '85')) AND NOT (`Transaction`.`state` >= 90)) AND DAY(`Transaction`.`created`) = DAY(NOW()) AND YEAR(`Transaction`.`created`) = YEAR(NOW()) AND (MONTH(`Transaction`.`created`)) = MONTH(NOW());
+-------+---------+---------+
| count | sum | revenue |
+-------+---------+---------+
| 357 | 3005550 | 338306 |
+-------+---------+---------+
1 row in set (0.22 sec)
[www@smith test]$ uptime
18:11:53 up 12 days, 1:57, 4 users, load average: 0.91, 0.75, 0.62
Live Server (2 x Xeon Quadcore):
processor : 7 vendor_id : GenuineIntel cpu family : 6 model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz stepping : 2 cpu MHz : 2395.000 cache size : 12288 KB physical id : 0 siblings : 8 core id : 10 cpu cores : 4
Dev Server (1 x Quadcore)
processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz stepping : 10 microcode : 0xa07 cpu MHz : 1998.000 cache size : 2048 KB physical id : 0 siblings : 4 core id : 3 cpu cores : 4
Live Server:
- CentOS 5.7
- MySQL ver 5.0.95
Dev Server:
- ArchLinux
- MySQL ver 5.5.25a
So, I ran the same database and queries on a Virtual Machine running Centos, 1 CPU and 512MB of memory: it provides the answer to that query in 0.3 seconds; system load is 0.4 :/
The only real difference seems to be that I am running Mysql 5.5 on that server. And it seems that there really is a 10x performance improvement in my case from Mysql 5.0 to Mysql 5.5.
I will only know for sure once I have migrated my live servers from Mysql 5.0 to Mysql 5.5, I will confirm the results once I have done that.
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