1Z0-054 · Question #18
Examine the initialization parameter values for the instance given below: NAME TYPE VALUE ------------------------------------ ----------- ------------------ optimizer_capture_sql_plan_baselines…
The correct answer is C. The statistics for the table and all the indexes associated with the table are not current. D. The table has less than DB_FILE_MULTIBLOCK_READ_COUNT blocks under the high-water. See the full explanation below for the reasoning.
Question
Examine the initialization parameter values for the instance given below:
NAME TYPE VALUE ------------------------------------ ----------- ------------------ optimizer_capture_sql_plan_baselines boolean FALSE optimizer_dynamic_sampling integer 2 optimizer_features_enable string 11.1.0.6 optimizer_index_caching integer 0 optimizer_index_cost_adj integer 100 optimizer_mode string ALL_ROWS db_file_multiblock_read_count integer 64 The index created on the column used in the WHERE clause of the query. You notice that the query is not using the index. Instead of an index scan, a full table scan is used. View the Exhibit and examine the autotrace output for a query. What could be the reason for it? (Choose all that apply.)
Exhibit
Options
- AThe OPTIMIZER_INDEX_COST_ADJ initialization parameter has a low value.
- BThe DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter has a low value.
- CThe statistics for the table and all the indexes associated with the table are not current.
- DThe table has less than DB_FILE_MULTIBLOCK_READ_COUNT blocks under the high-water
How the community answered
(48 responses)- A15% (7)
- B8% (4)
- C77% (37)
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