On 7 August 2011 21:24, Shawn H Corey <shawnhco...@gmail.com> wrote:
> On 11-08-07 11:46 AM, Ramprasad Prasad wrote: > >> I used a mysql database , but the order by clause used to hang the >> process indefinitely >> If I sort files in smaller chunks how can I merge them back ?? >> >> > Please use "Reply All" when responding to a message on this list. > > You need two temporary files and lots of disk space. > > 1. Open the first and second sorted files. > 2. Read one record from each. > 3. Write the lesser record to the first temporary file. > 4. Read another record from the file where you got the record you wrote. > 5. If not eof, goto 3. > 6. Write the remaining of the other file to the end of the temporary file. > > Repeat the above with the first temporary file and the third sorted file, > writing the result to the second temporary file. > > Repeat the above with the second temporary file and the fourth sorted file, > writing the result to the first temporary file. > > And so on... > > Rename the final temporary file to your sorted file name. > > > There would be a CPAN module already doing this ??
