[R] ROracle 0.5-0 package update
dj at research.bell-labs.com
Tue Apr 22 14:23:20 CEST 2003
An update to the ROracle package is now in CRAN.
* This version has an experimental dynamic SQL binding to data
frames. SQL statements can be "prepared" (parsed and cached for
improved performance), and columns of data frames bound to them
for automatic data transfer). For details see the help() for
"Oracle", "dbPrepareStatement" and "dbExecStatement".
* Host arrays are now operational. These are buffers used by Oracle's
internal implementation to reduce network traffic and speed
up fetches and prepared statements. Currently fetches use a
default buffer size (host arrays) of size 500 (previous version
did no buffering). **Very preliminary** results suggest performance
improvements on fetching of about a factor of 2.
(Note that the maximum size of these buffers is limited to about
65K bytes per column.)
* dbCommit() and dbRollback() are now explicitly implemented,
but save points are not (but you may code them through dynamic SQL).
* The precompiler ProC/C++ is now used with the option PARSE=none
to avoid bogus C errors with some compilers and/or platforms
(e.g., Mac OS X).
David A. James
Statistics Research, Room 2C-253 Phone: (908) 582-3082
Bell Labs, Lucent Technologies Fax: (908) 582-3340
Murray Hill, NJ 09794-0636
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