Forum OpenACS Development: Response to ACS 4.x won't scale (I hope I am wrong)

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53: Response to ACS 4.x won't scale (I hope I am wrong) (response to 1)
Posted by Dave Hwang on 10/30/01 09:05 PM

Jon, thanks for the script. I ran autoanalyze.sql and then re-ran the trace. The new results are available at http://www.goliath.org/acs/trace-permissions-after-analyze.txt (old results). Here is a summary of the results: 

   Query                    Before ANALYZE     After Analyze
==========================  =================  ==============
1. using IN                 query 232 rows     query 949 rows
2. using JOIN               query 335512 rows  query 8207 rows
3. using JOIN, not          query 561 rows     query 311 rows
   specifying priv
4. using IN and SELECT 'x'      n/a            query 950 rows
   instead of COUNT(*)

So I see that query 1 using IN got worse, and that queries 2 and 3 using JOIN got much better. However, there is still an order of magnitude difference between using IN and using JOIN (949 vs 8207).