Hi,
BrowserUK's reply looks quite good.
I just would like to chip in that if you are willing to chunk your data file in 100MB bites, based on my timing of unix sort on a 100MB file of 9 digit numbers it would cost you 100 hours to get sort all the data first. If you can at the same time ensure fixed length columns it will help.
You really do not want to do any disk I/O since on my machine it takes 7 hours just to read the file once. If you have sorted kill list that is chunked according to the extents of each data chunk you also only have 1/40 of the kill list to worry about (if distribution is even).
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|