Re: Block size with pg_dump?

Erik Jones wrote:
> >>> On the way back, likewise I could pipe the tape through dd before
> >>> giving it
> >>> to pg_restore.
> >>>
> >>> Does pg_dump care what blocksize it gets? If so, what is it?
> >>
> >> I assume you could pipe pg_dump into dd and specify the block size in
> >> dd.
> >>
> > Of course on the way out I can do that.
> >
> > The main question is, If I present pg_restore with a 65536-byte
> > blocksize
> > and it is expecting, e.g., 1024-bytes, will the rest of each block get
> > skipped? I.e., do I have to use dd on the way back too? And if so,
> > what
> > should the blocksize be?
>
> Postgres (by default) uses 8K blocks.

That is true of the internal storage, but not of pg_dump's output
because it is using libpq to pull rows and output them in a stream,
meaning there is no blocking in pg_dumps output itself.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://www.enterprisedb.com

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