On 2/14/07, Luke Lonergan <llonergan@greenplum.com> wrote:
>
> Here's one:
>
> Insert performance is limited to about 10-12 MB/s no matter how fast the
> underlying I/O hardware. Bypassing the WAL (write ahead log) only boosts
> this to perhaps 20 MB/s. We've found that the biggest time consumer in the
> profile is the collection of routines that "convert to datum".
>
> You can perform the test using any dataset, you might consider using the
> TPC-H benchmark kit with a data generator available at www.tpc.org. Just
> generate some data, load the schema, then perform some COPY statements,
> INSERT INTO SELECT FROM and CREATE TABLE AS SELECT.
I am curious what is your take on the maximum insert performance, in
mb/sec of large bytea columns (toasted), and how much if any greenplum
was able to advance this over the baseline. I am asking on behalf of
another interested party. Interested in numbers broken down per core
on 8 core quad system and also aggreate.
merlin
