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Exam Name: Oracle Database 11g Release 2: SQL Tuning Exam
Exam Code: 1Z0-117
Total Questions: 125 Q&As
Last Updated: Aug 13, 2022
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1Z0-117 Online Practice Questions and Answers
View the exhibit and examine the query and its execution plan from the PLAN_TABLE. Which statement is true about the execution?
A. The row with the ID column having the value 0 is the first step execution plan.
B. Rows are fetched from the indexes on the PRODUCTS table and from the SALES table using full table scan simultaneously, and then hashed into memory.
C. Rows are fetched from the SALES table, and then a hash join operator joins with rows fetched from indexes on the PRODUCTS table.
D. All the partitions of the SALES table are read in parallel.
Examine the parallelism parameter for your instance:
parallel_servers_target
Now examine the resource plan containing parallel statement directives:
Consumer Group resource plan containing parallel statement directives:
Which two are true about parallel statement queuing when this plan is active?
A. Urgent_group sessions collectively can consume up to 64 parallel execution servers before queuing starts for this consumer group.
B. ETL_GROUP sessions can collectively consume up to 64 parallel execution servers before the queuing starts for this consumer.
C. A single OTHER_GROUPS session will execute serially once it is queued for six minutes.
D. A single ETL_GROUP session can consume up to eight parallel execution servers.
E. A single ETL_GROUP session can consume up to 32 parallel execution servers.
F. A single OTHER_GROUPS session will execute in parallel once it is queued for six minutes.
View the Exhibit1 and examine the structure and indexes for the MYSALES table.
The application uses the MYSALES table to insert sales record. But this table is also extensively used for generating sales reports. The PROD_ID and CUST_ID columns are frequently used in the WHERE clause of the queries. These columns are frequently used in WHERE clause of the queries. These columns have few distinct values relative to the total number of rows in the table.
View exhibit 2 and examine one of the queries and its auto trace output. What should you do to improve the performance of the query?
A. Use the INDEX_COMBINE hint in the query.
B. Create composite index involving the CUST_ID and PROD_ID columns.
C. Gather histograms statistics for the CUST_ID and PROD_ID columns.
D. Gather index statistics for the MYSALES_PRODID_IDX and MYSALES_CUSTID_IDX indexes.
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