Sunday, 4 September 2011

Difference between object pooling and connection pooling

Object pooling is a COM+ service that enables you to reduce 
the overhead of creating each object from scratch. When an 
object is activated, it is pulled from the pool. When the 
object is deactivated, it is placed back into the pool to 
await the next request. You can configure object pooling by 
applying the ObjectPoolingAttribute attribute to a class 
that derives from the 
System.EnterpriseServices.ServicedComponent class. 
Object pooling lets you control the number of connections 
you use, as opposed to connection pooling, where you 
control the maximum number reached.
Following are important differences between object pooling 
and connection pooling: 
•	Creation. When using connection pooling, creation 
is on the same thread, so if there is nothing in the pool, 
a connection is created on your behalf. With object 
pooling, the pool might decide to create a new object. 
However, if you have already reached your maximum, it 
instead gives you the next available object. This is 
crucial behavior when it takes a long time to create an 
object, but you do not use it for very long. 
•	Enforcement of minimums and maximums. This is not 
done in connection pooling. The maximum value in object 
pooling is very important when trying to scale your 
application. You might need to multiplex thousands of 
requests to just a few objects. (TPC/C benchmarks rely on 
this.)

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