Often, you either can't or don't want to rewrite the query. However, you can still try and speed it up through any of the techniques we will discuss here.
Speeding up queries without rewriting them
How to do it…
By now, we assume that you've looked at various problems already, so the following are more advanced ideas for you to try.
Increasing work_mem
For queries involving large sorts or for join queries, it may be useful to increase the amount of working memory that can be used for query execution. Try setting the following:
SET work_mem = &apos...