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List:       pgsql-hackers
Subject:    Re: [HACKERS] Large number of open(2) calls with bulk INSERT into empty table
From:       Tom Lane <tgl () sss ! pgh ! pa ! us>
Date:       2011-11-30 18:45:15
Message-ID: 25165.1322678715 () sss ! pgh ! pa ! us
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Robert Haas <robertmhaas@gmail.com> writes:
> Yikes!  A table with 4 bytes of useful data is consuming 40kB on disk
> - 8kB in the main form, 8kB in the VM fork, and 24kB in the FSM fork.
> Ouch!

Yeah, ouch.  Why is the FSM fork eating so much space --- I'd have
expected 8k there, but 24?

Also, if VACUUM is going to cause the FSM to be created anyway, there
may not be a lot of point to refraining from creating the first page
right away.

			regards, tom lane

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