Jeff wrote:
Your application simply uses approach (b) and MySQL does the rest automatically. So if you

  SELECT * FROM mytable WHERE something='complex' LIMIT 0,30;

and then on another page / connection:

  SELECT * FROM mytable WHERE something='complex' LIMIT 30,30;

and then...

  SELECT * FROM mytable WHERE something='complex' LIMIT 60,30;

The main hit is on the first query, and provided that the data is not updated on the server, query 2 and query 3 are served directly from the cache.

Have you tried this? I was under the impression that MySQL would just stop when it finds enough row to satisfy LIMIT, so it wouldn't cache the whole result set.

- Perrin

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