Tablespace files deleted in continuous run

HI,

I am using PostgreSQL 8.4 in windows. I have created a database and
some tables on it. Also created a table space and some tables in it. My
application inserts data into these tables in every second. The
application is a continuous running application. My issue is that after
a 20-30 days continuous run ( Machine logged off 2 times), some of the
files in the \16384 folder of newly created table space are dropped
automatically. Can you tell me the reason for this.? How can we
recover from this?

I have a task that delete the data(only data stored in table) from the
tables in the tablespace in certain interval. Is there any problem
related to this?

Can you tell me the reason for this?

Thanks & Regards,

Vishnu S

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