What is happening in this plan
Hi, please take a look at the sub query and its plan. Step 9 in the Plan applies to the condition (ebill.is_synced_to_orig = 0 OR ebill.is_synced_to_orig IS NULL). but since this is a systematic index scan it applies is_synced_to_orig = 0 condition. But ideally another selectivity also consider right somewhere else. but I couldn't see that in the plan.Oracle jumps this condition? appreciate if anyone can tell what is happening in this plan for is_synced_to_orig IS NULL condition. Thank you...
SELECT ebill.ebill_summary_id
From ebill_summary INNER JOIN author orig electronic invoicing
ON ebill.originator_id = orig.originator_id
AND (ebill.is_synced_to_orig = 0 OR ebill.is_synced_to_orig IS NULL)
INNER JOIN entity e
ON e.entity_id = orig.entity_id
AND e.entity_type_id = 1
AND e.entity_id = 1
LEFT OUTER JOIN te_pmt_task_lock tl
ON tl.payment_request_id = ebill.ebill_summary_id
AND tl.te_task_id = 1234
AND tl.is_expired = 1
WHERE tl.payment_request_id IS NULL AND ROWNUM < = 1000;
------------------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | 1. 56. 16 (0) | 00:00:01 |
|* 1 | COUNTY STOPKEY |
|* 2 | FILTER |
| 3. NESTED EXTERNAL LOOPS | 1. 56. 16 (0) | 00:00:01 |
| 4. NESTED LOOPS | 1. 47. 2 (0) | 00:00:01 |
| 5. NESTED LOOPS | 1. 43. 1 (0) | 00:00:01 |
|* 6 | TABLE ACCESS BY INDEX ROWID | ENTITY | 1. 4. 1 (0) | 00:00:01 |
|* 7 | INDEX UNIQUE SCAN | ENTITIES_PK | 1 | | 0 (0) | 00:00:01 |
| 8. TABLE ACCESS BY INDEX ROWID | EBILL_SUMMARY | 1. 39. 0 (0) | 00:00:01 |
|* 9 | INDEX RANGE SCAN | EBILL_IS_SYNCED_TO_ORIG_IDX | 1 | | 0 (0) | 00:00:01 |
| * 10 | TABLE ACCESS BY INDEX ROWID | ORDERING PARTY | 1. 4. 1 (0) | 00:00:01 |
| * 11 | INDEX RANGE SCAN | ORIGINATOR_ENTITY_IDX | 1 | | 0 (0) | 00:00:01 |
| * 12 | INDEX RANGE SCAN | TEPMTTSKLCK_TSKEXPRDPYNREQ_ID | 1. 9. 14 (0) | 00:00:01 |
------------------------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
1 - filter(ROWNUM<=1000)
2 - filter("TL".") (PAYMENT_REQUEST_ID"IS NULL)
6 - filter("E".") ENTITY_TYPE_ID "= 1)
7 - access("E".") ENTITY_ID "= 1)
9 - access("EBILL".") IS_SYNCED_TO_ORIG "= 0)
10 - filter("EBILL".") ORIGINATOR_ID "=" ORIG. " ("' ORIGINATOR_ID")
11 - access("ORIG".") ENTITY_ID "= 1)
12 - access("TL".") TE_TASK_ID "(+) = 1234 AND"TL"". "" IS_EXPIRED "(+) = 1 AND"
"TL". "' PAYMENT_REQUEST_ID ' (+) ="BILLING ". ("' EBILL_SUMMARY_ID")
Well, if the column is declared as NOT NULL and you ask all lines such as the column = 1 OR it is null, then really you ask for all data where column = 1 since by definition, it cannot be null (the NOT NULL column constraint prohibits NULL data does not happen).
Make sense?
Now, I'm not saying that that's your problem, but because I didn't know what your tables look like... it's also good to guess I can muster.
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