Can I change some partitions of the partitioned table read-only?

I have a table partitioned by range( partitioned hourly).
I want to keep the history data online for query (the history data is rarely accessd). But in this way the table is too large. The performance may be a big problem. So some problems may be raised:
How can I change the aged partition read-only?
How to decrease the workload on this table and improve the performance?
Oracle 10g (10.2.0.3)+Solaris 10

How can I change the aged partition read-only?In 10.2.x.x I think only tablespaces can be made read only.
In 11g you can place tables in read only mode, but I don't know about specific partitions.

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<Modified subject line>
Moderator Message: Please use more descriptive subject lines in future.
Edited by: Suhas Saha on Nov 17, 2011 12:27 PM

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