Huge harddisk space overhead

Dear all,

I am new to PostgreSQL and I am having a problem where I could not find a post or article explaining the following problem:


I wanna store the content of an ascii file (numbers 1 to 30.000.000) in a postgre table.

The table has one coulmn defined as integer

I use a copy statement.

Afterwards the table is filled with the correct content.
I have no indexes but the disk space even after VACUUM is 1,3 GB.

Of course a database usually has a small overhead

but why is it 4 times the size of the ascii file.

What can I do to make the table smaller??

Thank you in advance

Neo

No one any idea?

Is this the wrong place to post?
Did I miss anything?