R - OSX Mountain Lion and CPU Limit - r

Question

I am collecting data via SQL query though R. I have a loop to pull small chunks of a large table, save the chunk and drop the chunk, on repeat for an hour or so till the whole table is in flat files in my RSQL directory.
However, R shoots a Cputime limit exceeded: 24 error every so often.
I am running Mountain Lion.
I have tried
nice -19n R CMD BATCH myscript.R
and the OS continues to kill the process at odd intervals. I do not believe the script to be getting stuck on a particular operation, it just takes a while to plough through the loop.
The loop looks like so..
for (i in 1:64){
foobyte <- NULL
for (j in 0:7){
max id = 1000000
rows = 1e5
to = max_id * (rows * j) - (i * 7 * rows)
from = max_id * (rows * (j-1)) - (1 * 7 * rows)
foobit <- queryDB(paste("SELECT * FROM foobar where id <= ', to,' and id > ',from,';")
foobyte <- rbind(foobit, foobyte)
}
filename <- paste("/my/data/dir/foobyte", j, ".csv", sep="")
write.table(foobyte, filename)
}
It runs for 30-90 minutes before crashing. I will try firing up R from a shell script calling ulimit in only that terminal session, and see how this works.

Answer 1

Tried ulimit... Appears I do not have access, even via sudo. I get the same output from
ulimit -a -H
before and after giving
ulimit -t 12000 # sets cputime limit to 12000 seconds from 600 seconds
SOLVED via Debian Virtual Machine. If someone has a Mountain Lionic solution, please let us know.

Answer 2

A cursory google search for "Cputime limit exceeded: 24" shows me that this is not an R specific error.
Based on the loop you've posted, I'm guessing its exceeding the cpu time limit on the queryDB call, due to the size of the chunks you're retrieving from the database.
I'm not sure if your from and to math checks out: At rows = 1e5, you're loading 1e11 ids, if you reduce it so rows = 1, you're loading 1e6 ids from the table.
Either way, try reducing size of the chunks you're loading from the database, and see if that helps