The index used only when given Index indicator
Hello
Version of RDBMS - 11.2.0.3.0
I have a situation where only when I use the Index indicator, index does is used.
Use case: -.
1. SELECT query on a table with about 100 KB of data.
2. have the index on the column that is used in the WHERE clause of the SELECT query.
CREATE TABLE him_entity (id NUMBER, him_val CHAR(1)); INSERT INTO him_entity SELECT rownum,'1' FROM dual CONNECT BY level<=1000000; CREATE INDEX idx_him_val ON him_entity(him_val);
Without using Index indicator, Explain plan: -.
SELECT ID FROM him_entity WHERE him_val='1'; ----------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ----------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1000K| 4882K| 498 (5)| 00:00:06 | |* 1 | TABLE ACCESS FULL| HIM_ENTITY | 1000K| 4882K| 498 (5)| 00:00:06 | ----------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 1 - filter("HIM_VAL"='1')
With the help of Index indicator, explain the plan: -.
SELECT /*+ index(him_entity idx_him_val)*/ ID FROM him_entity WHERE him_val='1'; --------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | --------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1000K| 4882K| 3485 (1)| 00:00:42 | | 1 | TABLE ACCESS BY INDEX ROWID| HIM_ENTITY | 1000K| 4882K| 3485 (1)| 00:00:42 | |* 2 | INDEX RANGE SCAN | IDX_HIM_VAL | 1000K| | 1824 (1)| 00:00:22 | --------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - access("HIM_VAL"='1')
(1) could you explain why Index was not be picked up without indicator Index for help?
(2) I gathered statistics for the table before running the query.
(3) is it fine / safe to use the FIRST_ROWS hint instead of Index indicator?
Thank you...
- SELECT THE ID
- OF him_entity
- WHERE him_val = '1';
You select all the rows in the table.
As your query will extract all lines then the optimal trajectory IS FULL TABLE SCAN instead of using INDEXES
If we let you use less than 5% of table rows, and then using index can be an optimal trajectory to go for the record.
- SELECT / * + index (him_entity idx_him_val) * / ID
- OF him_entity
- WHERE him_val = '1';
Your strength of indicator Index to fetch the file by using the index of the query
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