Oracle 1z0-054 Exam Practice Questions (P. 5)
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Question #21
You are working on an online transaction processing (OLTP) system. The CUST table in the SH schema was populated by direct load and after that it has gone through a lot of updates and deletions. The statistics for the CUST and SALES tables were updated recently.View the Exhibit and examine the query plan.The query is performing a lot of I/O for a query that fetches only 168 rows. To investigate further, you queried the ALL_TABLES view to find out PCTUSED, PCTFREE, and the number of rows in the CUST table, as given below:
SQL> SELECT table_name ,blocks, pct_used, pct_free, num_rows
2 FROM all_tables
3* WHERE table_name = 'CUST';
TABLE_NAME BLOCKS PCT_USED PCT_FREE NUM_ROWS
---------- ---------- ---------- ---------- ----------
CUST 13768 80 111060 -
What would you recommend to reduce the I/O?
SQL> SELECT table_name ,blocks, pct_used, pct_free, num_rows
2 FROM all_tables
3* WHERE table_name = 'CUST';
TABLE_NAME BLOCKS PCT_USED PCT_FREE NUM_ROWS
---------- ---------- ---------- ---------- ----------
CUST 13768 80 111060 -
What would you recommend to reduce the I/O?
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