[R] RODBC, optimizing memory, "Error: cannot allocate vector of size 522 Kb".

[Prof Brian Ripley]

This question is nothing to do with RODBC.

You need to study the rw-FAQ Q2.9: I believe you should be able to get up 
to (almost) 3GB on that system.  (BTW, you seem confused about units: I 
hope you have 3GB of RAM, where G means 1024^3.)


On Thu, 13 Dec 2007, Thomas Pujol wrote:

> I am using RODBC and "odbcConnect".  I have successfully used 
> odbcConnect to extract "modest" amounts of data from SQL.  For 
> convenience, (and maybe speed?) I wish, if possible, to extract larger 
> amounts of data in a single query.
>
>  (I am running R2.6.0 under a machine running Windows Small Business 
> Server with 3mb of RAM.  I run gc() prior to attempting the query.  I 
> have attempted to maximize the memory R uses by running the command 
> "memory.size(4095)")
>
>  After attempting my "odbcConnect" query, I receive the following error message:
>   "Error: cannot allocate vector of size 522 Kb".
>
>  After I received the message, I obtained the following statistics re my memory use:
>   memory.limit(size = NA)/1000 #reports memory size
> [1] 4.095
>> memory.size(max = F)/1000 #reports amount of memory currently in use
> [1] 1.930705
>> memory.size(max = T)/1000 #reports maximum amount of memory obtained from the OS
> [1] 1.93925
>
>  Before I give up and go back to running many queries to extract my data, I wanted to ask if there were any suggestions. (I really do wish to extract all this data for local storage as R-files on my hard-drive, it is just a question of the easiest and fastest process.)  Thanks.
>
>
>
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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