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<h4><a name="cache">6.1.7 <code>cache</code></a></h4>
<p><strong>Usage:</strong>
<pre> cache</pre></p>
<p>Stores in memory or on disk a temporary copy of the table at
this point in the pipeline.
This can provide improvements in efficiency if there is
an expensive step upstream and a step which requires
more than one read of the data downstream.
If you see an error like "Can't re-read data from stream"
then adding this step near the start of the filters
might help.
</p>
<p>The result of this filter is guaranteed to be random-access.
</p>
<p>See also the <a href="random.html"><code>random</code></a>
filter, which caches only when the input table is not
random-access.
</p>
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<hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
<a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
<a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
<a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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