Re: "Priority Mechanisms for OLTP and Transactional Web Applications"

Hi Dann,

I am also very happy you are interested in our work. I am working inside
the DB engine and have coauthored the work you are interested in; David
will happily share code with you. The latest and greatest on my side has
to do with componentization of database systems; we are using staging to
make databases work more reliably on modern hardware and expand easily
to networks of workstations. We deal with how to do queue management and
scheduling of different queries to different components in our
architecture. In addition to ICDE 04/05, please refer to our CIDR03,
VLDB04, and SIGMOD05 papers available off of my website.

I would be happy to talk in person about any and all of this.
Cheers,
Natassa

Anastassia Ailamaki
Computer Science Department
Carnegie Mellon University
http://www.cs.cmu.edu/~natassa

> -----Original Message-----
> From: Dann Corbit [mailto:DCorbit(at)connx(dot)com]
> Sent: Wednesday, May 04, 2005 4:39 PM
> To: harchol+(at)mor(dot)sync(dot)cs(dot)cmu(dot)edu; PostgreSQL-development
> Cc: cache+(at)cs(dot)cmu(dot)edu; harchol(at)cs(dot)cmu(dot)edu; natassa(at)cmu(dot)edu;
> bianca(at)cs(dot)cmu(dot)edu
> Subject: RE: "Priority Mechanisms for OLTP and Transactional
> Web Applications"
>
>
>
> > -----Original Message-----
> > From: harchol+(at)mor(dot)sync(dot)cs(dot)cmu(dot)edu
> [mailto:harchol+(at)mor(dot)sync(dot)cs(dot)cmu(dot)edu]
> > Sent: Wednesday, May 04, 2005 12:44 PM
> > To: Dann Corbit
> > Cc: cache+(at)cs(dot)cmu(dot)edu; harchol(at)cs(dot)cmu(dot)edu; natassa(at)cmu(dot)edu;
> > bianca(at)cs(dot)cmu(dot)edu
> > Subject: Re: "Priority Mechanisms for OLTP and Transactional Web
> > Applications"
> >
> > Dear Dann,
> >
> > First of all, thank you for your interest in our
> work. We've
> > got quite a few different priority implementations, based on our
> > papers in: ICDE 2004, ICDE 2005, TOIT 2005, TOCS 2003, and
> some newly
> > submitted papers that we just sent to VLDB 2005.
> >
> > Some of our most recent work, being led by my student Bianca
> > Schroeder, deals with implementing the priority mechanism
> *externally*
> > to the DBMS. The mechanism is a "black box" that sits
> between the web
> > server and the DBMS and schedules which transactions are
> allowed to be
> > sent into the DBMS and when. We find that this simple
> "external black
> > box" achieves comparable results to scheduling internally
> to the DBMS
> > and yet is far more portable, since it can work as a
> front-end to any
> > DBMS.
>
> This is (of course) a fascinating idea, and will be generally
> useful for any sort of database implementation. Since you
> are using a JDBC interface and manipulation the Java calls,
> there is no need to consider modifications to the PostgreSQL
> database [or any other] in such a circumstance. It does make
> an interesting study, and I think it may be even more
> interesting to see if both approaches can work together.
>
> However, the internal modifications are of more immediate
> interest to me, since it allows a simple way to achieve the
> benefits regardless of the interface method chosen.
>
> > If you are interested in the most recent "external
> approach" described
> > above, please let me know and I will gladly forward to you
> our recent
> > proposal on this idea and some papers in submission.
>
> I have seen and downloaded some of the papers from your web site.
>
> > All our earlier work deals with "internal scheduling approaches"
> > (scheduling *within* the DBMS or the OS). The relevant
> papers there
> > can be found on my web page or that of my students, and David
> > McWherter would be happy to help answer questions on implementation.
>
> I have contacted Mr. McWherter and he seems to have some
> interest in helping.
>
> Thank you for your quick and helpful reply.
>
>
> > With best regards,
> > Mor
> >
> > P.S. I didn't cc to "pgsql-hackers(at)postgresql(dot)org" since I
> wasn't sure
> > how far that list extended and didn't want to SPAM folks, but feel
> > free to pass on the above message if you think it's
> relevant to these
> > folks.
> >
> > -------------------------------
> > Mor Harchol-Balter
> > Associate Professor
> > Computer Science Dept
> > Carnegie Mellon University
> > 5000 Forbes Ave.
> > Pittsburgh, PA 15213-3891
> >
> > WEB: www.cs.cmu.edu/~harchol
> > Email: harchol(at)cs(dot)cmu(dot)edu
> > Phone: (412) 268-7893
> > Fax: (412) 268-5576
> > Assistant: Charlotte Yano
> > yano(at)cs(dot)cmu(dot)edu
> > -------------------------------
>