On 09/01/2015 02:58 AM, Mark Kirkwood wrote:
> On 01/09/15 21:41, Bruce Momjian wrote:
> I'm thinking that partitioning and sharding are two different things:
>
> Partitioning is about reducing the amount of table data accessed and
> also perhaps easing admin activities (archiving/removing old stuff etc).
>
> Sharding is a about parallelism and redundancy...copies of stuff in
> different places and concurrent access by virtue of it being on
> different nodes!
In our world, they are complimentary. Consider partitioning that uses
FDW tables with proper plan push down etc....
>
> Now *maybe* FDW is a good way to approach this, but really would be nice
> to see a more rigorous analysis (I note that like XC and XL, Greenplum
> looked at the existing mechanisms around at the time and ended up
> writing their own). Now I'm aware that things have moved on - but I
> think there needs to be a proper discussion about design and what we
> think distributed data/sharding etc should provide *before* grabbing
> hold of FDW as *the answer*!
Agreed.
Sincerely,
Joshua D. Drake
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