Several nested loop at the same level in an execution plan
Hi, I am using 11gR2, and I've seen a execution plan in the trace of my SQL query (also shown in pl/sql explain plan) with 4 nested loops all at the same level, what does this mean?
i.e.
- SELECT STATEMENT, GOAL = FIRST_ROWS
+ NESTED LOOPS
+ NESTED LOOPS
+ NESTED LOOPS
+ NESTED LOOPS
each NESTED LOOP can be expanded to 2 further actions, which make sense to me. e.g.
+ NESTED LOOPS
+ TABLE ACCESS BY INDEX ROWID
+ TABLE ACCESS BY INDEX ROWID
THANKS
Ye
>
why there are 4 Nested Loops
what is the final result set for the SELECT statement come from (any one of the 4)
the query run so slow in 11R2
>
So far you are the only one who knows what the query and execution plan are because you haven't posted them
>
Then you need to post the query, tell us what indexes are on the join columns and post the complete plan.
>
We can't even begin to explain why Oracle might have chosen the plan it did if we can't see the query and plan you want explained.
And if we only see the plan we might be able to tell you what Oracle is doing but without knowing what indexes might be on the join columns and the filter criteria columns we can't tell you why Oracle chose the plan it chose.
And the excerpt of the plan you did provide is incomplete. You removed the indenting possibly because you did not enclose it in 'code' tags (see the FAQ).
>
- SELECT STATEMENT, GOAL = FIRST_ROWS
+ NESTED LOOPS
+ NESTED LOOPS
+ NESTED LOOPS
+ NESTED LOOPS
>
There can't be four nested loops like that at the top level since the top level will be combining the result sets from it's children. A nested loop will have two children; like the last part you showed:
>
+ NESTED LOOPS
+ TABLE ACCESS BY INDEX ROWID
+ TABLE ACCESS BY INDEX ROWID
>
The two 'TABLE ACCESS ...' will be indented on a normal plan.
Without the query and plan there isn't much we can tell you.
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