On Tue, Mar 13, 2012 at 5:14 AM, Vick Khera <vivek@khera.org> wrote:
> I'll bet what happened was postgres re-wrote your table for you,
> effectively doing a compaction. You can get similar effect by doing
> an alter table and "changing" an INTEGER field to be INTEGER.
> Postgres does not optimize that do a no-op, so you get the re-writing
> effect.
How does table rewriting work? Does it happen a row at a time or all at once?
In other words, how much free disk space is needed on an 800 TB filesystem
to rewrite a 550 TB table? (Have I got enough space?)
Aleksey