caching - How granular should data in memcached be? -


I am curious about anything .. Will the generation of an RSS feed be "most efficient" to cache ? Or API response (like the response to / api / movies / info / a12345 ).

For example, should I cache the entire feed, and try and return back, as the Psuedo code: 

  id = GET_PARAMS ['id'] Cached = memcache.get ("feed_% s"% id) if not cached: None Cached: Returns cached: feed = gener_feed (id) Memcache.put ("feed_% s"% id, feed) Return feed < / Code>

Or cache query results and generate documents each time? 

  Id = sanitize (GET_PARMS ['id']) query = query ("SELECT title, body posts from WHERE id = %%", id) cached_query_result = memcache.get (query.hash) ()) If cached_query_result: feed = gener_feed (Cached_query_result) returns feed and: query_result = query.execute () memcache.put ("feed_% s"% id, query_result) feed = generated_feed (query_result)

(Or, some other way I remember?)

My experience For example, you should apply both to your solutions of many L-cache (provided that it is not the only code which is "SELECT title, body posts from WHERE id = %%" Uses Land. If it uses only the first one).

In the second version of the code, you memcache.get (query.hash ()) , but memcache.put ("feed_% s"%) Id, query_result ) . This will probably not work as you want (unless you have an unusual version of hash);)

I prefer to use something like query.hash () post-title-body-% id try to delete a video when it is stored in the cache , Because query.hash () . It can hang for months as a zombie-video.

By the way: 

  id = GET_PARMS ['id'] query = query ("select title, body terms by WHERE id = %%", id)

Do you take anything and put it in the right SQL query? This is bad (the result of SQL injection attacks).


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