Hi list,
I am still fighting with the really slow database queries (see
http://www.nabble.com/%22like%22-vs-%22substring%22-again-t4447906.html),
and I still believe that the cause of the problem is that the query
planner makes incorrect estimations about the selectivity of the where
clauses.
Christian Schröder wrote:
Or would it be possible to tweak how the planner determines the
selectivity? I have read in the docs (chapter 54.1) that in case of
more than one condition in the where clause, independency is
assumed. In my case (... where test like '11%' and test not like
