hoder.org

http://www.hobid.com/mcii

We are an independent electronic component distributor. Our strength lies in locating obsolete parts and hard-to-find components that are often cirtical to our customers’ operations. We also are very strong in supplying load cells and strain gauges.

http://www.hobid.com/newcentury

http://www.icic.biz/offerlist/   is an online global marketplace primarily for electronic components. The main goal of our site to find the most reliable suppliers from China to serve the inustrial need all over the world.

http://www.Hobid.biz - Request and compare quotes from leading distributors in the industry
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electronic components stock
   00443-62030    030-1975-001    0325-6017-001    0363-D25K10R    37693
   10-2-470    1004-375    101-99-00002    1010    10175247
   10183054    10184981    102    102070-002    10270960
   10272355    10309-B    103149-8    104389    105-0753-001
   105.518-8    1054-5013-31    10664168    108951P1 REV. A    109662-002
   10H501/BEAJC/883C    10H516/BEAJC/883    10H558/BEAJC/883C    1250-003    1275-415
   13086588-9    141-104-0001    142016-01    143511-02    148088-02
   15-1330-429-1    15-1330418-1    15-553167-1    150516-3052    150D106X9035R2
   151-0603-00    15157308    16366F TYPE WTG    171J    17C3-2177
   1816-0136    1820-0285    183115    1899-440-0/97942    18CV8SC-25

http://www.datasheet.ws/
Part No.  Technical Notes 
   2743019447  SURFACE MOUNT BEAD, 5.1MM LG., (DIFFERENTIAL-MODE), BROADBAN 
   2743021447  SURFACE MOUNT BEAD, 9.6MM LG., (DIFFERENTIAL-MODE), BROADBAN 
   2944666671  WOUND FERRITE BEAD, 2 1/2 TURNS, BROADBAND FREQUENCIES 1-2 
   AMK105BJ225MV  CAP, MLCC, 0402, 4V, X5R, 2.2UF, ¡À20%, T&R 
   AMK105BJ225MV-F  CAP, MLCC, 0402, 4V, X5R, 2.2UF, ¡À20%, T&R 
   AMK105BJ475MV  CAP, MLCC, 0402, 4V, X5R, 4.7uF, ¡À20%, T&R 
   AMK105BJ475MV-F  CAP, MLCC, 0402, 4V, X5R, 4.7uF, ¡À20%, T&R 
   AMK107BJ106MA  CAP, MLCC, 0603, 4V, X5R, 10UF, ¡À20%, T&R 
   AMK107BJ106MA-T  CAP, MLCC, 0603, 4V, X5R, 10UF, ¡À20%, T&R 
   AMK107BJ226MA  CAP, MLCC, 0603, 4V, X5R, 22uF ¡À20%, T&R 
   AMK107BJ226MA-T  CAP, MLCC, 0603, 4V, X5R, 22uF ¡À20%, T&R 
   AMK107BJ475MK  CAP, MLCC, 0603, 4V, X5R, 4.7UF, ¡À20%, T&R 
   AMK107BJ475MK-T  CAP, MLCC, 0603, 4V, X5R, 4.7UF, ¡À20%, T&R 
   AMK316BJ107ML  CAP, MLCC, 1206, 4V, X5R, 100UF, ¡À20%, T&R 
   AMK316BJ107ML-T  CAP, MLCC, 1206, 4V, X5R, 100UF, ¡À20%, T&R 
   AMK316BJ476ML  CAP, MLCC, 1206, 4V, X5R, 47UF, ¡À20%, T&R 
   AMK316BJ476ML-T  CAP, MLCC, 1206, 4V, X5R, 47UF, ¡À20%, T&R 
   BK1005HM102  FERRITE BEAD, MULTILAYER CHIP, 0402, 1000 OHMS, ¡À25%, T&R 

http://www.hobid.info/

Tecal Electronics, LLC

November 15th, 2008

http://icinventory.biz/
AZEGO Technology Services inventory file

November 14th, 2008

Modes of Operation

vi, the Unix visual editor, has two modes of operation:

1. Command mode–This is vi’s initial and normal state. In this mode, most commands you type are not displayed. Only commands preceded by :, /, or ! are displayed on the status line, which also gives feedback about input, output, and large changes. Execute these commands with <Return> or <Esc>. Use <Esc> to change from text input mode to command mode (when in doubt, press <Esc>).
2. Text input (Insert) mode–This mode is entered by pressing a, A, i, I, o, or O. Press <Esc> to end text input mode and return to command mode.

For more information about using vi, see the online help note (on Uniform Access Unix computers, enter help vi).

The following notations are used in this document (variables appear in italics):

Craigslist 的数据库架构    每月超过 1000 万人使用该站服务，月浏览量超过 30 亿次，(Craigslist每月新增的帖子近 10 亿条??)网站的网页数量在以每年近百倍的速度增长。Craigslist 至今却只有 18 名员工(现在可能会多一些了)。Tim O’reilly 采访了 Craigslist 的 Eric Scheide ，于是通过这篇 Database War Stories #5: craigslist 我们能了解一下 Craigslist 的数据库架构以及数据量信息。

数据库软件使用 MySQL 。为充分发挥 MySQL 的能力，数据库都使用 64 位 Linux 服务器, 14 块 本地磁盘(72*14=1T ?), 16G 内存。

不同的服务使用不同方式的数据库集群。
论坛
1 主(master) 1 从(slave)。Slave 大多用于备份. myIsam 表. 索引达到 17G。最大的表接近 4200 万行。
分类信息
1 主 12 从。 Slave 各有个的用途. 当前数据包括索引有 114 G , 最大表有 5600 万行(该表数据会定期归档)。 使用 myIsam。分类信息量有多大? “Craigslist每月新增的帖子近 10 亿条”，这句话似乎似乎有些夸张，Eric Scheide 说昨日就超过 330000 条数据，如果这样估计的话，每个月的新帖子信息大约在 1 亿多一些。
归档数据库
1 主 1 从. 放置所有超过 3 个月的帖子。与分类信息库结构相似但是更大， 数据有 238G， 最大表有 9600 万行。大量使用 Merge 表，便于管理。
搜索数据库
4 个 集群用了 16 台服务器。活动的帖子根据 地区/种类划分，并使用 myIsam 全文索引，每个只包含一个子集数据。该索引方案目前还能撑住，未来几年恐怕就不成了。
Authdb
1 主 1 从，很小。

目前 Craigslist 在 Alexa 上的排名是 30，上面的数据只是反映采访当时(April 28, 2006)的情况，毕竟，Craigslist 数据量还在每年 200% 的速度增长。

Craigslist 采用的数据解决方案从软硬件上来看还是低成本的。优秀的 MySQL 数据库管理员对于 Web 2.0 项目是一个关键因素。

 

http://www.diybl.com/course/7_databases/mysql/myxl/2007614/52429.html

如何将Access和Excel导入到Mysql中

 

http://info.codepub.com/2008/08/info-21401.html

构建支持Master/Slave读写分离的数据库操作类

PHP+MYSQL 简单实现中文分词全文索引

http://info.codepub.com/2008/07/info-20442.html

 

http://unix-cd.com/vc/www/26/2008-07/10189.html

http://www.example.net.cn/archives/example/index.html

http://hi.baidu.com/xproduct/blog/item/850c19f44c1eb76cddc47480.html

 http://www.yesadmin.com/647/139291/index.html

mysql主从数据库同步

MySQL数据库磁盘优化

所谓死锁<DeadLock>: 是指两个或两个以上的进程在执行过程中,因争夺资源而造成的一种互相等待的现象,若无外力作用,它们都将无法推进下去.此时称系统处于死锁状态或系统产生了死锁,这些永远在互相等待的进程称为死锁进程.

Stop PHP nobody Spammers
http://www.webhostgear.com/232.html
Update: May 25, 2005:
- Added Logrotation details
- Added Sample Log Output

PHP and Apache has a history of not being able to track which users are sending out mail through the PHP mail function from the nobody user causing leaks in formmail scripts and malicious users to spam from your server without you knowing who or where.

Watching your exim_mainlog doesn’t exactly help, you see th email going out but you can’t track from which user or script is sending it. This is a quick and dirty way to get around the nobody spam problem on your Linux server.

If you check out your PHP.ini file you’ll notice that your mail program is set to: /usr/sbin/sendmail and 99.99% of PHP scripts will just use the built in mail(); function for PHP - so everything will go through /usr/sbin/sendmail =)

Requirements:
We assume you’re using Apache 1.3x, PHP 4.3x and Exim. This may work on other systems but we’re only tested it on a Cpanel/WHM Red Hat Enterprise system.

Time:
10 Minutes, Root access required.

Step 1)
Login to your server and su - to root.

Step 2)
Turn off exim while we do this so it doesn’t freak out.
/etc/init.d/exim stop

Step 3)
Backup your original /usr/sbin/sendmail file. On systems using Exim MTA, the sendmail file is just basically a pointer to Exim itself.
mv /usr/sbin/sendmail /usr/sbin/sendmail.hidden 

Step 4)
Create the spam monitoring script for the new sendmail.
pico /usr/sbin/sendmail

Paste in the following:

#!/usr/local/bin/perl

# use strict;
 use Env;
 my $date = `date`;
 chomp $date;
 open (INFO, “>>/var/log/spam_log”) || die “Failed to open file ::$!”;
 my $uid = $>;
 my @info = getpwuid($uid);
 if($REMOTE_ADDR) {
         print INFO “$date - $REMOTE_ADDR ran $SCRIPT_NAME at $SERVER_NAME n”;
 }
 else {

        print INFO “$date - $PWD -  @infon”;

 }
 my $mailprog = ‘/usr/sbin/sendmail.hidden’;
 foreach  (@ARGV) {
         $arg=”$arg” . ” $_”;
 }

 open (MAIL,”|$mailprog $arg”) || die “cannot open $mailprog: $!n”;
 while (<STDIN> ) {
         print MAIL;
 }
 close (INFO);
 close (MAIL); 

Step 5)
Change the new sendmail permissions
chmod +x /usr/sbin/sendmail

Step 6)
Create a new log file to keep a history of all mail going out of the server using web scripts
touch /var/log/spam_logchmod 0777 /var/log/spam_log

Step 7)
Start Exim up again.
/etc/init.d/exim start 

Step
Monitor your spam_log file for spam, try using any formmail or script that uses a mail function - a message board, a contact script.
tail - f /var/log/spam_log 

Sample Log Output

Mon Apr 11 07:12:21 EDT 2005 - /home/username/public_html/directory/subdirectory -  nobody x 99 99   Nobody / /sbin/nologin

Log Rotation Details
Your spam_log file isn’t set to be rotated so it might get to be very large quickly. Keep an eye on it and consider adding it to your logrotation.

pico /etc/logrotate.conf

FIND:
# no packages own wtmp — we’ll rotate them here
/var/log/wtmp {
    monthly
    create 0664 root utmp
    rotate 1
}

ADD BELOW:

# SPAM LOG rotation
/var/log/spam_log {
    monthly
    create 0777 root root
    rotate 1
}

Notes:
You may also want to chattr + i /usr/sbin/sendmail so it doesn’t get overwritten.