Hmm... from the 'performance' point of view, since the data comes from a quite complex select statement, Isn't it better/quicker to have this select replaced by a select into and creating a temporary database?
> The problem, as I understand it, is that 7.4 introduced massive > improvements in handling moderately large in() clauses, as long as they > can fit in sort_mem, and are provided by a subselect. > > So, creating a temp table with all the values in it and using in() on > the temp table may be a win: > > begin; > create temp table t_ids(id int); > insert into t_ids(id) values (123); <- repeat a few hundred times > select * from maintable where id in (select id from t_ids); > ... ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
