[Monetdb-developers] Fw: Re: Fw: Re: need help in monetdb xquery interface
Stefan.Manegold at cwi.nl
Sat Mar 6 15:09:20 CET 2010
On Sat, Mar 06, 2010 at 07:27:09PM +0530, anshul gangwar wrote:
> how can we get the estimate of the size of result of query based on any two attributes with varying rangeAnshul
Well, I guess you'd need to browse the related research literature for
XML/XQuery cost modeling / result size estimation techniques --- however, to
my knowledge that area is not yet as well charted and understood as cost
modeling / result size estimation for relational algebra and SQL.
Of course, the details highly depend on your XML document structure and data
distribution as well as the shape and characteristics of your XQuery queries
> On Sat, Mar 06, 2010 at 11:32:03AM +0530, anshul gangwar wrote:
> > --- On Fri, 5/3/10, Martin Kersten <Martin.Kersten at cwi.nl> wrote:
> > From: Martin Kersten <Martin.Kersten at cwi.nl>
> > Subject: * Re: [Monetdb-developers] need help in monetdb xquery interface
> > To: "anshul gangwar" <anshul1886 at yahoo.co.in>
> > Date: Friday, 5 March, 2010, 11:26 PM
> > anshul gangwar wrote:
> > > hello ,
> > > I want to know whether there is any expression or command or anything equivalent to explain sql construct. Also What is the way to
> > There is material for you to study on the website:
> > http://monetdb.cwi.nl/SQL/Documentation/SQL-Runtime-Features.html
> > http://monetdb.cwi.nl/SQL/Documentation/EXPLAIN-Statement.html#EXPLAIN-Statement
> > > get histogram statistics i.e way to find that histogram exists on attribute or not through Xquery interface. not through sql .
> > MonetDB does not rely on separate statistics tables.
> > > Please reply as soon as possible.
> > >
> > > thank you.
> > Actually i want the xquery construct equivalent to sql explain construct and
> MonetDB/XQuery does not provide such feature.
> To see the equivalent of the SQL EXPLAIN output, i.e., the MIL plan
> generated from your XQuery query, you need to use the Pathfinder stand-alone
> compiler "pf"; see
> `pf --help`
> `pf --fullhelp`
> for details.
> > so how it simulates histogram features i.e to get that percentage of query etc.
> Like MonetDB/SQL also
> MonetDB/XQuery does not rely on separate statistics
> such as histograms.
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