Thank you very much!!
On Mon, Jun 28, 2021 at 1:18 AM Jonathan Lewis <jlewisoracle@xxxxxxxxx>
wrote:
There are two details that show what the hash join is doing:
In the predicate information section the predicate for operation 8 (the
hash join) is access("TMTD"."PMENT"="TAD"."PMENT"); in other words, this is
where TAD and TMTD are joined.
The other detail is in the shape of the plan - it's an example of
NLJ_BATCHING (see
https://jonathanlewis.wordpress.com/2014/04/23/nl-history/ - search for
thge section "Basic Plan for 11g (11.2.0.4)")
The first of the two nested loops you specified was between table TNI and
(only) the index MTD_PK
The second of the two nested loops was between that result and table TMTD
Regards
Jonathan Lewis
On Sun, 27 Jun 2021 at 19:37, Pap <oracle.developer35@xxxxxxxxx> wrote:
Thank you very much Jonathan and Andrew.
Andrew, for my understanding here, I think you got the HASH JOIN access
of TAD clue from below plan, but i am still not able to understand how this
path suggests the HASH JON access of TAD, as because line 9 and 10 shows
two nested loops and HASH Join is in third position in the tree. So I am
assuming line 9- i.e first nested loop JOIN is between TNI and TMTD and
line 10 is for the join between TAD and the result set out of TNI JOIN
TMTD. So doesn't it mean that table TAD is also accessed in a nested loop
path here?
