Re: Performance of joins to inserted pseudo-table

Not sure if this helps but we've found by turning on "hash_join" the performance of a self join of inserted table is substantially quicker.

Hash joins are turned off in our sever (15.7 SP11) and it seems to be the default

name          currentsetting      defaultsetting

hash_join    0                          0               

Is this because our optgoal is set to "allrows_oltp" ?

Incidently the manual says, we set the optgoal rather than use "set hash_join" but we get the message.

     SET PLAN OPTGOAL command not allowed within a trigger.

Why is this ?