Re^4: seeking help for seek function

hi, thanks for your reply. Actually, i am getting the file position from the first file and find records in the first file too. I am using the second file, only to know which record i should fetch based on the id given in second file. Thus i am matching the id's from the second file to the first file. The second file is important for the cluster headings.Thanks !!!

Comment on Re^4: seeking help for seek function

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Re^5: seeking help for seek function by Marshall (Canon) on Mar 25, 2010 at 10:56 UTC
I don't know how big file2 is. I guess file 1 is the big one with all the data. An alternate approach would be to process file 2 a bit more, perhaps make a hash structure with these id's as keys and values either a hash or array with the cluster number and place for data from file 1. Read file 1 sequentially and save the data if needed in the structure that describes file 2. Then print structure when finished reading file 1. You are reading file1 all the way thru and then seeking around in it and structure to describe seek positions I assume is gonna be pretty big. Anyway if the data you need from file 1 fits into memory (the stuff that file 2 wants to know), this approach is faster because you don't have to do all the seeking around which is a fairly slow operation. Just an idea.	[reply]

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Re^5: seeking help for seek function
by Marshall (Canon) on Mar 25, 2010 at 10:56 UTC

You are reading file1 all the way thru and then seeking around in it and structure to describe seek positions I assume is gonna be pretty big. Anyway if the data you need from file 1 fits into memory (the stuff that file 2 wants to know), this approach is faster because you don't have to do all the seeking around which is a fairly slow operation. Just an idea.

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