On Mon, Mar 08, 2010 at 07:26:15PM +0530, anshul gangwar wrote:
hello
how can we get the final executed plan i.e at run time in monetdb. as pysical-algebra-plan only shows the result after compilation time.
And at runtime what does it acually does i.e after sampling what does it decide i.e type of join or others thing also.
Except from choosing algorithms and implementations based on the properties of operators' actual input(s) at runtime, the physical algebra plan (MIL program) is executed as is. Choosing the algorothms and implementations is done inside the operators' implementations (see e.g., the code in MonetDB/src/gdk/relop.(mx|c)), and can only be traced by single-stepping the execution in a debugger or by enabling debugging output via the Mserver commandline option --debug=2097152 (see MonetDB4/conf/MonetDB.conf[.in] or <prefix>/etc/MonetDB.conf for all available debug options.) Stefan -- | Dr. Stefan Manegold | mailto:Stefan.Manegold@cwi.nl | | CWI, P.O.Box 94079 | http://www.cwi.nl/~manegold/ | | 1090 GB Amsterdam | Tel.: +31 (20) 592-4212 | | The Netherlands | Fax : +31 (20) 592-4199 |