On Tue, Nov 8, 2011 at 5:50 PM, Gabor Grothendieck <ggrothendi...@gmail.com>wrote:
> In R, the RSQLite driver for SQLite currently has > SQLITE_MAX_VARIABLE_NUMBER set to 999. This is used by many people > for many different projects and on different platforms and it seems > that a number of these projects want a larger number. Users don't > compile this themselves so they are stuck with whatever number is > compiled in for them. > > What are the considerations for setting this number? > > Is there any general advice that can be given on how to set this number? > I just checked and it appears that MacOS Lion compiles it a 500000. Whenever you use a value like ?N, SQLite allocates an array of N objects, each of 72 bytes in size. So doing "SELECT ?500000" on Lion requires a 36MB memory allocation (with its accompanying memset()). That's really the only downside to choosing a really large SQLITE_MAX_VARIABLE_NUMBER. > > -- > Statistics & Software Consulting > GKX Group, GKX Associates Inc. > tel: 1-877-GKX-GROUP > email: ggrothendieck at gmail.com > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > -- D. Richard Hipp d...@sqlite.org _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
