On Sat, Mar 06, 2010 at 11:32:03AM +0530, anshul gangwar wrote:
>
>
> --- On Fri, 5/3/10, Martin Kersten <
Martin.Kersten@cwi.nl> wrote:
>
> From: Martin
Kersten <
Martin.Kersten@cwi.nl>
> Subject: * Re: [Monetdb-developers] need help in monetdb xquery interface
> To: "anshul gangwar" <
anshul1886@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`
and/or
`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.
Stefan