On 12/8/06, Erik van Zijst <[EMAIL PROTECTED]> wrote: > 2. R's native C-api > [http://cran.r-project.org/doc/manuals/R-exts.html#The-R-API] does not > separate parsing from evaluation. When the same script is evaluated 10 > times, it is also parsed 10 times. > > I'm mostly concerned about the second issue. Our scripts are registered > once and continuously evaluated. I want to avoid parsing the same script > again each time it is evaluated. Does the engine recognize previously > parsed scripts (like oracle does for SQL queries)?
A database server is doing rather more than simply parsing a query--it's also running a query planner to optimize execution and quite possibly a number of other things so it behooves the DBMS to cache that information whenever possible. The closest functional equivalent in R would be wrapping everything in a function and then serializing the resulting function somewhere. ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
