find numeric duplicates from 300 million lines....

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# 1  
find numeric duplicates from 300 million lines....

these are numeric ids..

I have text file having 300 millions of line as shown above. I want to find duplicates from this file. Please suggest the quicker way..
sort | uniq -d will take longer time and may run out of memory.

# 2  
Is the data in any particular order? Did it come from a database?

Do you have a database engine? Some processes are just not suitable for Shell tools.
# 3  
Yes the data is in the same order as i have provided. I am not getting data from database. This is in text file only.
# 4  
You might get enough information from this thread.

Off course, if you have no option left ( within database, as methyl suggested )
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