Re: Convert PLSQL update with forall

In principle, there is no reason why a FORALL would make this quicker. Fetching data from sql into plsql to then drive other sql should be avoided.

Best approach *should* be a single MERGE statement, no loops.

But there are always caveats and exceptions.

Cheers
Dominic

Sent from my iPhone

> On 20 May 2018, at 17:37, amonte <ax.mount_at_gmail.com> wrote:
>
> Hello
>
> I have a plsql procedure which contains a complex cursor and a couple of update statements using the cursor output, it looks like
>
>
> begin
>
> for indx in (complex query)
> loop
>
> if indx.c10 = 'NO' then
> update t1
> set c3 = c2 + c4
> where c1 = indx.c1
> and c2 = indx.c2;
> else
> update t1
> set c5 = c7 + c8
> where c1 = indx.c1
> and c2 = indx.c2
> end if;
>
> end loop;
> end;
> /
>
> The cursor (join of 7 tabls and a few EXISTS subqueries) returns aproximately 2 million rows and the process is not as fast as desired. I was looking into FORALL to improve this procedure but I cannot find a way due to the conditional updates (two different update statements). Anyone's got an idea if FORALL can be implemented in such situations?
>
> Thank you very much
>
> Alex
>

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