Обсуждение: Urgent help needed for press contact

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Urgent help needed for press contact

От
Francois Suter
Дата:
Hi all,

I was contacted a while ago by a French computer magazine who's going
to run a special issue on open source databases. They are supposed to
run case studies and I directed them to several volunteer French
PostgreSQL users.

Now they have just come back with a spreadsheet for comparing 4 OS DBs:
MySQL, PostgreSQL, Firebird and MAXDB/SAPDB. The deadline for filling
the table is tomorrow morning and there are some answers I don't (and
some stupid questions I would rather not answer, but that's beside the
point).

So I would greatly appreciate any help to answer the following:

-time to install (in hours) (talk about a stupid question!)
- hot backup: do we support that? (I'm not quite sure what is meant by
that: replacing a database with its backup without losing a single
transaction?)
- replication: I mentioned eRserver. Should I mention something else?
- the 3 strongest points
- the 3 weakest points
- minimal configuration in CPU, RAM and disks
- max number of databases, records, record size, simultaneous
connections
- memory footprint per connection
- max number of SQL queries per second (that sounds ridiculous, it
really depends on what query)
- number of users in the world

TIA for the help.

---------------
Francois

Home page: http://www.monpetitcoin.com/

"Would Descartes have programmed in Pascal?" - Umberto Eco


Re: Urgent help needed for press contact

От
Shridhar Daithankar
Дата:
On Wednesday 05 November 2003 16:12, Francois Suter wrote:
> Hi all,
>
> I was contacted a while ago by a French computer magazine who's going
> to run a special issue on open source databases. They are supposed to
> run case studies and I directed them to several volunteer French
> PostgreSQL users.
>
> Now they have just come back with a spreadsheet for comparing 4 OS DBs:
> MySQL, PostgreSQL, Firebird and MAXDB/SAPDB. The deadline for filling
> the table is tomorrow morning and there are some answers I don't (and
> some stupid questions I would rather not answer, but that's beside the
> point).
>
> So I would greatly appreciate any help to answer the following:
>
> -time to install (in hours) (talk about a stupid question!)

15 minutes from source compile on a good(read good CPU) Unix system.
2-3 minutes if you have source package..

Some handy URLs
http://techdocs.postgresql.org/guides/Windows
http://wiki.ael.be/index.php/PostgresQL101

> - hot backup: do we support that? (I'm not quite sure what is meant by
> that: replacing a database with its backup without losing a single
> transaction?)

Hot backup means backing up database without taking it down. We can do that.
(Provided the survey shares same opinion/definition of hot backup)

> - replication: I mentioned eRserver. Should I mention something else?

Yes. GBorg replication page. Net connectivity is dead here, unfortunately. You
have to hunt it yourself.

http://gborg.postgresql.org/project/pgreplication/projdisplay.php
http://gborg.postgresql.org/genpage?replication_research

> - the 3 strongest points

-Focus on
 * SQL compliane
 * Data integrity
- Flexibility
 * User defined rules
 * User defined languages
 * User defined data types
- simplicity
 * Minimum overhead install
 * Database engine does not include any bloated extras
 * Easy to start with and maintain

</Very subjective opinion>

> - the 3 weakest points

- Native windows port
- Built in async. replication and support for hot failover
-

Thats it. I can't fill up third one..:-)

> - minimal configuration in CPU, RAM and disks

Not explicitly tested for minimum configuration but following should work

100MHz CPU/ 8MB RAM/>100MB disk

> - max number of databases, records, record size, simultaneous
> connections

http://www.postgresql.org/users-lounge/limitations.html

Number of connections are limited by configuration and maximum available
shared memory.

> - memory footprint per connection

Not very sure but IIRC it is around 576KB per connection. But lot of this
could be shared as well. Just tested on my machine. +/- sharing tricks played
by linux. This is by using free and getting true memory usage.

> - max number of SQL queries per second (that sounds ridiculous, it
> really depends on what query)

Upto machine and network resources. Depends upon queries as well.

> - number of users in the world

Duh. We don't maintain registers for the users for sure. How the heck do we
answer this?

Probably this questions defines boundary of geekdom and PHBhood. If you can
answer this, you are/can be a PHB..:-)

HTH

 Shridhar


Re: Urgent help needed for press contact

От
Devrim GUNDUZ
Дата:
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Hi,

On Wed, 5 Nov 2003, Shridhar Daithankar wrote:

> > - number of users in the world
>
> Duh. We don't maintain registers for the users for sure. How the heck do we
> answer this?

There is a section in pgsql.com/user_gallery; but I'm pretty sure that it
is not accurate :))

Regards,

- --
Devrim GUNDUZ
devrim@gunduz.org                devrim.gunduz@linux.org.tr
            http://www.tdmsoft.com
            http://www.gunduz.org
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Re: Urgent help needed for press contact

От
Peter Eisentraut
Дата:
Francois Suter writes:

> -time to install (in hours) (talk about a stupid question!)

0.084 h plus time for download/CD access

> - hot backup: do we support that? (I'm not quite sure what is meant by
> that: replacing a database with its backup without losing a single
> transaction?)

Yes (pg_dump)

Hot backup means that you can back up the data without interfering with
the ongoing use of the database.

> - replication: I mentioned eRserver. Should I mention something else?

pgreplicator, dbmirror, clustered JDBC (well, not really replication, but
same result)

> - the 3 strongest points

features, extensible, really free

> - the 3 weakest points

too many features, too extensible, upgrades

> - minimal configuration in CPU, RAM and disks

1 CPU, 4 MB RAM, 1 disk (say, 100 MB)

> - max number of databases, records, record size, simultaneous
> connections

unlimited, unlimited, 1.6 TB, process limit of OS

> - memory footprint per connection

I count about 800 kB.

> - max number of SQL queries per second (that sounds ridiculous, it
> really depends on what query)

yeah...

> - number of users in the world

many :-)

--
Peter Eisentraut   peter_e@gmx.net


Re: Urgent help needed for press contact

От
"Merlin Moncure"
Дата:
> - the 3 strongest points
candidates:
MVCC
Extensibility (particularly wrt languages. Pl/sql, etc.)
Not frequently mentioned, but I find the psql shell to be far superior
to the other's (particularly wrt sql command help sytax) which
translates into easier administration.

- the 3 weakest points
win32 port.  beyond that, the other open source databases are simply not
competitive in a broad sense.

- max number of SQL queries per second (that sounds ridiculous, it
Maybe this is not quite so ridiculous.  In my particular case, this
happens to be very important.  I use postgres to emulate a COBOL file
system for integration with legacy applications.  Since COBOL
applications always process one record at a time (think cursors) the
query turnaround time becomes important (assuming network latency is not
a major factor).  From my work in this area, I can tell you that, even
on older hardware, pg can process between 200-1000 queries per second
(queries being select * from t where id = x type things), with the
average being about 500.  Of course, this is highly dependant on
situational factors.

Generally, though, the database's ability to deal with transactions is
(much) more important. i.e. tpc score.

Regards and Good Luck,
Merlin

Re: Urgent help needed for press contact

От
Robert Treat
Дата:
On Wed, 2003-11-05 at 09:53, Merlin Moncure wrote:
> - the 3 weakest points
> win32 port.  beyond that, the other open source databases are simply not
> competitive in a broad sense.
>
PITR, 2 phase commit, simplicity of replication, updateable views...
some of those database have some of these things which we do not.

Robert Treat
--
Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL


Re: Urgent help needed for press contact

От
"Joshua D. Drake"
Дата:
>>- replication: I mentioned eRserver. Should I mention something else?
>>
>>
>
>pgreplicator, dbmirror, clustered JDBC (well, not really replication, but
>same result)
>
>
>

I would not mention pgreplicator as it doesn't work with newer versions.

ErServer, Rserv, dbmirror, Mammoth Replicator

>>- minimal configuration in CPU, RAM and disks
>>
>>
>
>1 CPU, 4 MB RAM, 1 disk (say, 100 MB)
>
>
>
Perhaps a more reasonable requirement should be listed. 32 Megs maybe?

>>- max number of SQL queries per second (that sounds ridiculous, it
>>really depends on what query)
>>
>>
>
>
>

O.k. well how about this... depends entirely on the hardware being used
but on sub 2000.00
machines in real world tests we can get 5000 TPS.


>
>
>>- number of users in the world
>>
>>
>
>many :-)
>
>
>


--
Command Prompt, Inc., home of Mammoth PostgreSQL - S/ODBC and S/JDBC
Postgresql support, programming shared hosting and dedicated hosting.
+1-503-222-2783 - jd@commandprompt.com - http://www.commandprompt.com
Editor-N-Chief - PostgreSQl.Org - http://www.postgresql.org



Re: Urgent help needed for press contact

От
Francois Suter
Дата:
Thanks to all for your help and answers. My deadline is now, so I won't
be able to take into account later comments, but I think I could answer
the questions in a satisfactory way. I will try to keep this list
posted on this article when it is published.

Cheers.

---------------
Francois

Home page: http://www.monpetitcoin.com/

"Would Descartes have programmed in Pascal?" - Umberto Eco


Re: Urgent help needed for press contact

От
Richard Schilling
Дата:
Happy to help out.  I have some good case studies:

http://www.thenew-hometeam.com is run on a postgres database.  We never exceed 10 seconds retreival time on queries on
thedatabase. 

> -time to install (in hours) (talk about a stupid question!)

Average time: 10-30 minutes.

> - hot backup: do we support that? (I'm not quite sure what is meant by
> that: replacing a database with its backup without losing a single
> transaction?)

yes - we support it in our operations.  All databaes are backed up on spare drives, and we can bring a database back up
inless than 30 minutes in a worst case scenario. 

> - replication: I mentioned eRserver. Should I mention something else?
> - the 3 strongest points

pick three: JDBC and ODBC drivers are free, use of genetic algorithms, access to original developers, wide availability
ofskillset, excellent software engineering choices by the designers, compact size, robustness 

> - the 3 weakest points

NOTE: These are probably the weakest points from the standpoint of the average enterprise customer (e.g. Microsoft SQL
customers)lack of more tools like pgAccess, high level of skill required to finetune (which I don't mind either), and
lackof a native Windows executable build (which I don't mind). 

> - minimal configuration in CPU, RAM and disks

see recommended hardware.  I've run this on a 486 with less than 500 mb of disk space and 128 MB of RAM.

> - max number of databases, records, record size, simultaneous

not sure - haven't hit a maximum yet.  We're at several dozen at this point.  Note, Microsoft SQL can usually only
handleone or two large databases at once. 


> connections
> - memory footprint per connection

not sure - it's documented in the installation notes for the Sun boxes.

> - max number of SQL queries per second (that sounds ridiculous, it
> really depends on what query)

I would guess, on a small query several thousand into the tens of thousands.

> - number of users in the world

I would take the number of downloads and multiply by a factor of 20-50.



On 2003.11.05 02:42 Francois Suter wrote:
> Hi all,
>
> I was contacted a while ago by a French computer magazine who's going
> to run a special issue on open source databases. They are supposed to
> run case studies and I directed them to several volunteer French
> PostgreSQL users.
>
> Now they have just come back with a spreadsheet for comparing 4 OS DBs:
> MySQL, PostgreSQL, Firebird and MAXDB/SAPDB. The deadline for filling
> the table is tomorrow morning and there are some answers I don't (and
> some stupid questions I would rather not answer, but that's beside the
> point).
>
> So I would greatly appreciate any help to answer the following:
>
> -time to install (in hours) (talk about a stupid question!)
> - hot backup: do we support that? (I'm not quite sure what is meant by
> that: replacing a database with its backup without losing a single
> transaction?)
> - replication: I mentioned eRserver. Should I mention something else?
> - the 3 strongest points
> - the 3 weakest points
> - minimal configuration in CPU, RAM and disks
> - max number of databases, records, record size, simultaneous
> connections
> - memory footprint per connection
> - max number of SQL queries per second (that sounds ridiculous, it
> really depends on what query)
> - number of users in the world
>
> TIA for the help.
>
> ---------------
> Francois
>
> Home page: http://www.monpetitcoin.com/
>
> "Would Descartes have programmed in Pascal?" - Umberto Eco
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: Have you searched our list archives?
>
>                http://archives.postgresql.org
>

Re: Urgent help needed for press contact

От
Shridhar Daithankar
Дата:
On Wednesday 05 November 2003 16:48, Shridhar Daithankar wrote:
> On Wednesday 05 November 2003 16:12, Francois Suter wrote:
> > Hi all,
> >
> > I was contacted a while ago by a French computer magazine who's going
> > to run a special issue on open source databases. They are supposed to
> > run case studies and I directed them to several volunteer French
> > PostgreSQL users.
> >
> > Now they have just come back with a spreadsheet for comparing 4 OS DBs:
> > MySQL, PostgreSQL, Firebird and MAXDB/SAPDB. The deadline for filling
> > the table is tomorrow morning and there are some answers I don't (and
> > some stupid questions I would rather not answer, but that's beside the
> > point).
> >
> > So I would greatly appreciate any help to answer the following:
> >
> > -time to install (in hours) (talk about a stupid question!)
>
> 15 minutes from source compile on a good(read good CPU) Unix system.
> 2-3 minutes if you have source package..

Oops.. Precompiled package. This is for a Unix system. Not for a windows
system..

> Yes. GBorg replication page. Net connectivity is dead here, unfortunately.
> You have to hunt it yourself.
>
> http://gborg.postgresql.org/project/pgreplication/projdisplay.php
> http://gborg.postgresql.org/genpage?replication_research

Obviously net worked in the meantime..:-)

 Shridhar