Re: Quick Performance Poll

I have been following your work with great interest.  I believe I spoke to someone from Greenplum at linux world in
Boston a couple of weeks ago.

---------- Original Message -----------
From: "Luke Lonergan" <llonergan@greenplum.com>
To: jim@contactbda.com, "Simon Dale" <sdale@rm.com>, pgsql-performance@postgresql.org
Sent: Thu, 20 Apr 2006 08:03:10 -0700
Subject: Re: [PERFORM] Quick Performance Poll

> Jim,
>
> On 4/20/06 7:40 AM, "Jim Buttafuoco" <jim@contactbda.com> wrote:
>
> > First of all this is NOT a single table and yes I am using partitioning and
> > the constaint exclusion stuff.  the largest
> > set of tables is over 2T.  I have not had to rebuild the biggest database yet,
> > but for a smaller one ~1T the restore
> > takes about 12 hours including many indexes on both large and small tables
>
> You would probably benefit greatly from the new on-disk bitmap index feature
> in Bizgres Open Source.  It's 8.1 plus the sort speed improvement and
> on-disk bitmap index.
>
> Index creation and sizes for the binary version are in the table below (from
> a performance report on bizgres network.  The version in CVS tip on
> pgfoundry is much faster on index creation as well.
>
> The current drawback to bitmap index is that it isn't very maintainable
> under insert/update, although it is safe for those operations.  For now, you
> have to drop index, do inserts/updates, rebuild index.
>
> We'll have a version that is maintained for insert/update next.
>
> - Luke
>
>   #   Indexed Columns   Create Time (seconds)   Space Used (MBs)
>                                 BITMAP   BTREE   BITMAP   BTREE
>   1   L_SHIPMODE                454.8   2217.1   58     1804
>   2   L_QUANTITY                547.2   937.8    117    1804
>   3   L_LINENUMBER              374.5   412.4    59     1285
>   4   L_SHIPMODE, L_QUANTITY    948.7   2933.4   176    2845
>   5   O_ORDERSTATUS             83.5    241.3    5      321
>   6   O_ORDERPRIORITY           108.5   679.1    11     580
>   7   C_MKTSEGMENT              10.9    51.3     1      45
>   8   C_NATIONKEY               8.3     9.3      2      32
------- End of Original Message -------