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The Org Mode 7 Reference Manual
by Carsten Dominik and others
Paperback (6"x9"), 282 pages
ISBN 9781906966089
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14.8.2.11 :cache

The :cache header argument controls the use of in-buffer caching of the results of evaluating code blocks. It can be used to avoid re-evaluating unchanged code blocks. This header argument can have one of two values: yes or no.

no
The default. No caching takes place, and the code block will be evaluated every time it is called.
yes
Every time the code block is run a SHA1 hash of the code and arguments passed to the block will be generated. This hash is packed into the #+results: line and will be checked on subsequent executions of the code block. If the code block has not changed since the last time it was evaluated, it will not be re-evaluated.
ISBN 9781906966089The Org Mode 7 Reference ManualSee the print edition