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What is Page File

In short Page File is simply a file on the hard drive that handles situations where the system wants to move or page out sections of memoryThere are several situations that cause this, but the one you're most concerned about is when the system is out of physical memory.Tech net Article is best to configure & monitor Paging File.


A very important question was raised by Parikshit Bisht @ SQLBangalore UG . I am just converting this group discussion into the blog-post, and the Question was as below :  

(1) How we de-fragment page file. 
(2) If my server is 32 bit with 4 GB of RAM. Then what size you suggest me to mention in page file. Same question as regard with 64 bit.
(3) If page file is small size, what problem we face as per SQL Point of view...

Balmukund Lakhani Sir : He said,

Since you have already read many articles, you should know that Page File comes into picture whenever a process data has to be paged out of physical RAM to this physical file.  There are many KB articles on Microsoft site to provide you recommendations. Since you have asked not to paste the link, I would provide KB number 314482 and 889654.Let me attempt to answer the questions now.

1. Here is what I should suggest

a.) Create a temporary page file on another drive
b.) Reboot
c.) Defragment the drive that held the original page file
d.) Eliminate the temporary page file
e.) Recreate the original page file
f.) Reboot
g.) If you want to spend money, Diskeeper is a 3rd party software which does that. (I am not providing any recommendation)

2. Refer the KB which is provided earlier. 

3. Of course, performance hit. If memory page which is SQL data page is paged out, it has be read again from pagefile to memory. 

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