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深入分析MySQL Sending data查詢慢問題_Mysql_腳本之家
通過一個實例給大家分享了MySQL Sending data表查詢慢問題解決辦法。最近在代碼優(yōu)化中,發(fā)現(xiàn)了一條sql語句非常的慢,于是就用各種方法進行排查,最后終于找到了原因。一、事故現(xiàn)場 1 2 3 4 SELECT og.goods_barcode, og.color_id, og.size_id, SUM(og.goods_number) AS sold_number FROM order o LEFT JOIN ...
www.dbjr.com.cn/article/1300...htm 2025-6-8
基于UDP傳輸協(xié)議的實現(xiàn)分析之流量和擁塞控制_網(wǎng)絡協(xié)議_網(wǎng)絡_腳本之...
where B is the estimated link capacity and C is the current sending speed. All are counted as packets per second. PS is the fixed size of UDT packet counted in bytes. Beta is a constant value of 0.0000015. 4) The SND period is updated as: SND = (SND * SYN) / (SND * inc + SY...
www.dbjr.com.cn/network/2215...html 2025-6-8
WFTPD Pro Server _Exploit_網(wǎng)絡安全_腳本之家
*WFTPD server <= 3.25 SITE ADMN DoS * * * *Sending command SITE ADMN \32 makes server BOOM * * * *usage: wftpd_dos.exe ip port user pass * * * *Coded by Marsu <Marsupilamipowa@hotmail.fr> * ***/ #include "winsock2.h" #include "stdio.h" #include "stdlib.h" #pragma comme...
www.dbjr.com.cn/hack/57...html 2025-6-9
linux下面建立GPRS無線MODEM撥號的方法_RedHat/Centos_操作系統(tǒng)_腳...
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 OK --> Modem initialized. --> Sending: ATDT*99***1# --> Waiting for carrier. ATDT*99***1# CONNECT --> Carrier detected. Waiting for prompt. ~[7f]}#@!}!}!} }7}"}&} } } } }#}%B#}%}%}&I=}3[18]}(}"}^...
www.dbjr.com.cn/os/RedHat/10...html 2025-5-23
在Linux中使用Smartctl監(jiān)控磁盤性能的方法_LINUX_操作系統(tǒng)_腳本之家
Sending command: "Execute SMART Extended self-test routine immediately in off-line mode". Drive command "Execute SMART Extended self-test routine immediately in off-line mode" successful. Testing has begun. Please wait 102 minutes for test to complete. ...
www.dbjr.com.cn/LINUXjishu/3406...html 2025-5-19
mysql 卡死 大部分線程長時間處于sending data的狀態(tài)_Mysql_腳本之家
看mysql的說明,sending data狀態(tài)表示兩種情況,一種是mysql已經(jīng)查詢了數(shù)據(jù),正在發(fā)給客戶端;另一種情況是,mysql已經(jīng)知道某些數(shù)據(jù)需要去什么地方讀取,正在從數(shù)據(jù)文件中讀取 mysql官方說,這不是mysql的bug,但是官方也沒說怎么處理...那么,看情況,就應該是配置方面的問題了。 首先從...
www.dbjr.com.cn/article/166...htm 2025-6-8
Mysql查詢很慢卡在sending data的原因及解決思路講解_Mysql_腳本之家
但是還是有一些沒辦法緩存的,或者說,每次查詢都是不一樣的結果的就沒辦法了。用navicat的查詢概況可以看到卡住的地方是在:Sending data一段,用時3.5秒,占了99%的查詢時間。 在網(wǎng)上查了一些,有些是因為sql語句的問題,但是我這個完全沒有用到varchar,也沒用到in方法。
www.dbjr.com.cn/article/1590...htm 2025-6-1
例子1. Sending mail. Using mail() to send a simple email: <?php// The message$message = "Line 1\nLine 2\nLine 3";// In case any of our lines are larger than 70 characters, we should use wordwrap()$message = wordwrap($message, 70);// Sendmail('caffinated@example.com', '...
www.dbjr.com.cn/shouce/php5/zh/function... 2025-5-27