Обсуждение: Largest PG database known to man!

On 10/1/2013 2:49 PM, Mark Jones wrote:
> We are currently working with a customer who is looking at a database
> of between 200-400 TB! They are after any confirmation of PG working
> at this size or anywhere near it.


is that really 200-400TB of relational data, or is it 199-399TB of bulk
data (blobs or whatever) interspersed with some relational metadata?

what all is the usage pattern of this data?   that determines the
feasibility of something far more than just the raw size.




--
john r pierce                                      37N 122W
somewhere on the middle of the left coast

Thanks for your quick response John.

From the limited information, it is mostly relational.
As for usage patterns, I do not have that yet.
I was just after a general feel of what is out there size wise.

Regards


----------------------------------------------------
   Mark Jones
   Principal Sales Engineer Emea


   http://www.enterprisedb.com/

   Email: Mark.Jones@enterprisedb.com
   Tel: 44 7711217186
   Skype: Mxjones121














On 01/10/2013 22:56, "John R Pierce" <pierce@hogranch.com> wrote:

>On 10/1/2013 2:49 PM, Mark Jones wrote:
>> We are currently working with a customer who is looking at a database
>> of between 200-400 TB! They are after any confirmation of PG working
>> at this size or anywhere near it.
>
>
>is that really 200-400TB of relational data, or is it 199-399TB of bulk
>data (blobs or whatever) interspersed with some relational metadata?
>
>what all is the usage pattern of this data?   that determines the
>feasibility of something far more than just the raw size.
>
>
>
>
>--
>john r pierce                                      37N 122W
>somewhere on the middle of the left coast
>
>
>
>--
>Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
>To make changes to your subscription:
>http://www.postgresql.org/mailpref/pgsql-general

Hi all,

We are currently working with a customer who is looking at a database of between 200-400 TB! They are after any confirmation of PG working at this size or anywhere near it.

Anyone out there worked on anything like this size in PG please? If so, can you let me know more details etc..  

----------------------------------------------------

   Mark Jones
   Principal Sales Engineer Emea

   http://www.enterprisedb.com/
   
   Email: Mark.Jones@enterprisedb.com
   Tel: 44 7711217186
   Skype: Mxjones121

On 10/1/2013 3:00 PM, Mark Jones wrote:
> >From the limited information, it is mostly relational.

phew.   thats going to be a monster.    400TB on 600GB 15000rpm SAS
drives in raid10 will require around 1400 drives.   at 25 disks per 2U
drive tray, thats 2 6' racks of nothing but disks, and to maintain a
reasonable fanout to minimize IO bottlenecks, would require on the order
of 25 SAS raid cards.   or, a really big SAN with some serious IOPS.
and naturally, you should have at least 2 of these for availability.

if we assume the tables average 1KB/record (which is a fairly large
record size even including indexing), you're looking at 400 billion
records.   if you can populate these at 5000 records/second, it would
take 2.5 years of 24/7 operation to populate that.

this sort of big data system is probably more suitable for something
like hadoop+mongo or whatever on a cloud of 1000 nodes, not a monolithic
SQL relational database.


--
john r pierce                                      37N 122W
somewhere on the middle of the left coast

On 02/10/13 07:49, Mark Jones wrote:
> Hi all,
>
> We are currently working with a customer who is looking at a database
> of between 200-400 TB! They are after any confirmation of PG working
> at this size or anywhere near it.
> Anyone out there worked on anything like this size in PG please? If
> so, can you let me know more details etc..
> ----------------------------------------------------
>
Wow that's awesome - but you know the difference between 200TB and 400TB
is quite significant (100%)? Like a whole bunch of cash
significant...unless we are talking GB.
But is that it? This isn't really fair, is this a test?
Jules

* John R Pierce (pierce@hogranch.com) wrote:
> if we assume the tables average 1KB/record (which is a fairly large
> record size even including indexing), you're looking at 400 billion
> records.   if you can populate these at 5000 records/second, it
> would take 2.5 years of 24/7 operation to populate that.

5000 1KB records per second is only 5MB/s or so, which is really quite
slow..  I can't imagine that they'd load all of this data by doing a
commit for each record and you could load a *huge* amount of data *very*
quickly, in parallel, by using either unlogged tables or wal_level =
minimal and creating the tables in the same transaction that's loading
them.

> this sort of big data system is probably more suitable for something
> like hadoop+mongo or whatever on a cloud of 1000 nodes, not a
> monolithic SQL relational database.

Or a federated PG database using FDWs..

Sadly, I've not personally worked with a data system on the 100+TB range
w/ PG (we do have a Hadoop environment along that scale) but I've built
systems as large as 25TB which, built correctly, work very well.  Still,
I don't think I'd recommend building a single-image PG database on that
scale but rather would shard it.

    Thanks,

        Stephen

On 10/1/2013 6:53 PM, Stephen Frost wrote:
> I don't think I'd recommend building a single-image PG database on that
> scale but rather would shard it.

sharding only works well if your data has natural divisions and you're
not doing complex joins/aggregates across those divisions.



--
john r pierce                                      37N 122W
somewhere on the middle of the left coast