Wrong Cardinality And Nested Loop Issue (Doc ID 2666644.1)

Last updated on JULY 20, 2024

Applies to:

Oracle Database - Enterprise Edition - Version 12.2.0.1 and later
Information in this document applies to any platform.

12.2.0.1 version simple query with ANSI JOIN is using Nested Loops / Merge Join method for this query
CBO generates lateral view based execution for right outer joins that have
filter predicates on the right side of the join (as part of the join):

Plan hash value: 2519657318

------------------------------------------------------------------------------
-----------
| Id | Operation | Name | Rows | Bytes | Cost
(%CPU)| Time |
------------------------------------------------------------------------------
-----------
| 0 | SELECT STATEMENT | | 1 | 26 | 11M(15)| 00:07:21 |
| 1 | SORT AGGREGATE | | 1 | 26 | | |
| 2 | NESTED LOOPS OUTER | | 78M| 1935M| 11M (15)| 00:07:21 |
| 3 | TABLE ACCESS FULL | T1 | 98335 | 2496K| 114 (15)| 00:00:01 |
| 4 | VIEW | VW_LAT_C83A7ED5 | 794 | | 115 (15)| 00:00:01 |◄◄◄◄◄
|* 5 | FILTER | | | | | |
|* 6 | TABLE ACCESS FULL| T2 | 794 | 20644 | 115 (15)| 00:00:01 |
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Symptoms

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