Oracle
1Z0-054 · Question #205
1Z0-054 Question #205: Real Exam Question with Answer & Explanation
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Question
View Exhibit1 and examine the indexes on the CUSTOMERS table. The statistics for the CUSTOMERS table have been updated recently by using the following command: SQL> EXEC DBMS_STATS.GATHER_TABLE_STATS('SH','CUSTOMERS', method_opt=>'FOR ALL INDEXED COLUMNS SIZE AUTO'); View Exhibit2 to examine a query plan. Even though the index is present on the COUNTRY_ID and CUST_GENDER columns, the query uses a full table scan. What could be the reason?
Exhibit
Options
- Abecause the histogram statistics for the COUNTRY_ID column are not updated
- Bbecause the DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter is set to a high
- Cbecause the optimizer calculates the cost of accessing blocks by using a full table scan to be less
- Dbecause indexes on CUST_GENDER and COUNTRY_ID columns are of different types, the
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