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which scenarios we go for jdbc,and which scenario we go for
connection polling and wat r advantages and disadvantages
using connection pooling.
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Answer Posted / mukundan
First part of the question seems irrelevant as JDBC has to
be used to access RDB irrespective of whether Connection
pooling is used or not.
Advantage of creating and using connection pooling is to
share the number of connections to the database in an
organized and distributed ways when the same RDB is used by
multiple applications.
Using connection pooling is advantageous
(1) the application doesn't overshoot with the number of
connections available/allotted for the application
(2) creating connection with a RDB is a costly operation
where as this is done one time and a pool of connection is
created during the startup of the application
(3) Connections from the pool are readily available for use
and they are reused which is much faster as per (2) above
Disadvantages of Connection pooling:
(1) When multiple application uses a RDB, each application
grabs its share (the allotted number of connections) during
start-up irrespective of its usage of the grabbed
connections. For example, if one application grabs 100
connections up front and its peak usage is only 40 or 50
then they are strictly not available to any other
application who's peak usage may be more than their allocation.
(2) If connections are not released appropriately by the
applications then the performance of the systems could go
haywire.
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