Re: Slow update with simple query

Arnaud Lesauvage <thewild@freesurf.fr> writes:
> Indeed, the new query does not perform that well :

> "Hash Join  (cost=112.75..307504.97 rows=2024869 width=355) (actual time=53.995..246443.811 rows=2020061 loops=1)"
> ...
> "Total runtime: 2777844.892 ms"

> I removed all unnecessary indexes on t1 before running the query (I left the index on uid and the multicolumn index
containindthe updated field). 
> I believe the multicolumn-functional-index computation is taking some time here, isn't it ?

Given that the plan itself only takes 246 sec, there's *something*
associated with row insertion that's eating the other 2500+ seconds.
Either index entry computation or constraint checking ...

            regards, tom lane