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See this thread and this one for details.
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what is connection pool

 
chennaisen kumar
Greenhorn
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its a interview question - can anybody help me
 
Amol Fuke
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Connection pool is the group of connection objects.You can implment your own connection pool or can use application servers connection pool.At the start up ,server creates connection pool with connection objects.You can specify pool size.
Whenever you make database transaction ,connection object from pool is used.Once your transaction is over object is returned to the pool.
 
David O'Meara
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Android Eclipse IDE Ubuntu
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You could also see this recent thread.
 
Annie Smith
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An article on connection pooling
 
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