Should the PersistenceManager be closed after every query?

I have a utility class that handles querying the datastore. This class
then returns results which are used by JSP pages to show output.

AFAIK, these are my options:

* Make all my data objects detachable (what is the extra cost of doing
this? Don't they have to be copied when detaching?
)
* Make a second call on the utility class to close the PM (defeats the
purpose of having the utility class)

* Leave my PM unclosed (what is/are the implications of this?)

I am referring to a case where I am only doing reads from the data
store.

Regards,
Harshdeep

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