What is an IIS application pool?

Question

What exactly is an application pool? What is its purpose?

Answer 1

IIS-Internet information Service is a web server used to host one or more web application . Lets take any example here say Microsoft is maintaining web server and we are running our website abc.com (news content based)on this IIS. Since, Microsoft is a big shot company it might take or also ready to host another website say xyz.com(ecommerce based).

Now web server is hosting i.e providing memory to run both websites on its single web server.Thus , here application pools come into picture . abc.com has its own rules, business logic , data etc and same applies to xyz.com.

IIS provides two application pools (path) to run two websites in their own world (data) smoothly in a single webserver without affecting each ones matter (security, scalability).This is application pool in IIS.

So you can have any number of application pool depending upon on servers capacity

Answer 2

An application pool is a group of one or more URLs that are served by a worker process or set of worker processes. Application pools are used to separate sets of IIS worker processes that share the same configuration and application boundaries.

Answer 3

application pool provides isolation for your application. and increase the availability of your application because each pool run in its own process so an error in one app won't cause other application pool . and we have shared pool that hosts several web applications running under it and dedicated pool that has single application running on it .

Answer 4

An application pool is a group of urls served by worker processors or set of worker processors.

There can exist any number of application pools.

In IIS it is possible to create more than one application pool.

An application in different application pool runs in different worker processors.

Advantage: If an error occurred in one application pool will not effect the applications running in another application pool.

Answer 5

An application pool is a group of one or more URLs that are served by a worker process or set of worker processes. Any Web directory or virtual directory can be assigned to an application pool.

Every application within an application pool shares the same worker process.

Answer 6

Assume scenario where swimmers swim in swimming pool in the areas reserved for them.what happens if swimmers swim other than the areas reserved for them,the whole thing would become mess.similarly iis uses application pools to seperate one process from another.