TESTED 20 Dec
Printable PDF1Z0-117 Exam Questions & Answers
Vendor: Oracle
Certifications: Oracle Database
Exam Code: 1Z0-117
Exam Name: Oracle Database 11g Release 2: SQL Tuning Exam
Updated: Dec 15, 2024
Q&As: 125
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1Z0-117 Online Practice Questions and Answers
Examine the initializing parameters:
An index exists on the column used in the WHERE of a query. You execute the query for the first time today and notice that the query is not using the index. The CUSTOMERS table has 55000 rows.
View the exhibit and examine the query and its execution plan.
What can be the two reasons for full table scan?
A. The value of the OPTIMIZER_INDEX_COST_ADJ parameter is set to a low value.
B. The blocks fetched by the query are greater than the value specified by the DB_FILE_MULTIBLOCK_READ_COUNT parameter.
C. The statistics for the CUSTOMERS table and the indexes stale.
D. The OPTIMIZER_MODE parameter is set to ALL_ROWS.
E. Histogram statistics for CUST_CITY_ID are missing.
F. Average number of rows per block for the CUSTOMERS table is low.
Your database has the OLTP_SRV service configured for an OLTP application running on a middle tier. This service is used to connect to the database by using
connection pools. The application has three modules. You enabled tracing at the service by executing the following command:
SQL exec DBMS_MONITOR.SERV_MOD_ACT_TRACE_ENABLE (`OLTP_SRV');
What is the correct method of consolidating the trace files generated by the procedure?
A. Use all trace files as input for the tkprof utility to consolidate the trace files for a module.
B. Use one trace file at a time as input for the trcess utility and use tkprof utility to consolidate all the output files for a module.
C. Use the trcess utility to consolidate all trace files into a single output file, which can then be processed by the tkprof utility.
D. Use the tkprof utility to consolidate the trace files and create an output that can directly be used for diagnostic purposes.
Examine the Exhibit to view the structure of and indexes for the EMPLOYEES and DEPARTMENTS tables:
EXAMINE the SQL statement and its execution plan:
Which two statements are correct regarding the execution plan?
A. Step 2 is performing nested operation on JOB_ID column of the JOBS table, which is the driven table and the EMPLOYEES table is the driven table.
B. In step 2 for every row returned by the JOBS table matching rows from the EMPLOYEES table are accessed.
C. Step 1 is performing nested loop operation on the DEPARTMENT_ID column of the DEPARTMENTS table, which is the driven table and results returned by step 2 in the driving resultset.
D. The performance of the query can be improved by creating bitmap index on the JOB_ID column of the EMPLOYEES table.
E. The performance of the query can be improved by creating bitmapped index on the DEPARTMENT_ID column of the EMPLOYEES table.
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