Knowledge base for Windows Webmasters, Administrators and Web hosting compagnies, with a special attention to WAMP (Windows Apache MySQL PHP). Most articles/tips are currently in use on web hosting servers. This is an open site, please participate or even join us.
New:
eAccelerator 0961 for PHP 5.3.3
eAccelerator 0961 for PHP 5.2.14
eAccelerator 0.9.5.1 for PHP 4.4.9

eAccelerator binaries for PHP 5.x (windows builds)

For the Windows eAccelerator for php 5.3+ visit our new page at:eAccelerator binaries for PHP 5.3+.

Updated: eAccelerator download using latest code (0.9.5.3 with PHP 5.2.9).

Please find following the compiled binaries of eAccelerator for Windows using Microsoft VC++ 6. For PHP 4 versions: eAccelerator binaries for PHP 4.x.
If you need a version not offered here, let us know (post comment).

thread_cache_size thread_concurrency

The thread cache hit rate can be calculated with Threads_created/Connections. Ideally you want the threads cached to be able to handle all connections. So a stable (zero growth) or low Threads_created status variable is the goal.

A thread_cache_size of zero is the default for my-medium.cnf but the recommended size in my-large.cnf is 8.
Depending on your specific situation, in some case this value can be very high (like 150+).
For an idea of the value needed, check the status variable Max_used_connections. If possible have thread_cache_size equal to the peak Max_used_connections value.
According to my-large.cnf the value for thread_concurrency should follow: number of CPU's*2 for thread_concurrency

My Values:

Apache Better Log Rotation mod_log_rotate

Important: The Apache provided tool rotatelogs.exe is to buggy to use "for real", see: Apache Rotatelogs.exe for Windows Server

FrontPage Guestbook, Board, Forms spam

The main raison for people spamming your FrontPage Guestbook, Forum/Board or forms is that the search engine Google, counts every "back link" (i.e. link pointing to these SPAM sites) as a positive vote. So if they can get a link to their site on your Guestbook, Google will interpret this as an "endorsement" of their site and give then additional "importance".

This spamming activity is especially common nowadays since they are thousands of automated scripts looking for FrontPage (or not, they will try to spam anything really...) guestbooks, boards, or forms to post SPAM links.

eAccelerator

We have been using this PHP accelerator (0.9.X), on multiple servers, for a long time. It's used on some high traffic sites without any problem.

Install:
a) Download a copy of eAccelerator that is compatible with your version of PHP.
This can be an issue with eAccelerator. Sometimes it can take a little time before the Windows binaries are available for the most recent version of PHP.

Setting up PHP as Fast CGI (FCGI) under Apache

1) Download the Apache mod_fcgi module: http://fastcgi.coremail.cn/

2) Configuration in your Apache httpd.conf:
a) LoadModule fcgid_module modules/mod_fcgid.so

b.1) <Directory "C:/Apache2/htdocs/php/">
    SetHandler fcgid-script
    Options execCGI

APC binaries for PHP 5.x (windows builds)

Updated: APC download using latest code (3.0.12p2).