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NO.1 Your database supports an online transaction processing (OLTP) application. The application is
undergoing some major schema changes, such as addition of new indexes and materialized views.
You want to check the impact of these changes on workload performance.
What should you use to achieve this?
A. SQL Performance Analyzer
B. SQL Tuning Advisor
C. SQL Access Advisor
D. Database replay
E. Automatic Workload Repository compare reports
Answer: A
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Explanation:
You can use the SQL Performance Analyzer to analyze the SQL performance impact of any type of
system change. Examples of common system changes include:
Database upgrades
Configuration changes to the operating system, hardware, or database
Database initialization parameter changes
Schema changes, such as adding new indexes or materialized views
Gathering optimizer statistics
SQL tuning actions, such as creating SQL profiles
http://docs.oracle.com/cd/B28359_01/server.111/b28318/intro.htm#CNCPT961
NO.2 On your Oracle 12c database, you Issue the following commands to create indexes
SQL > CREATE INDEX oe.ord_customer_ix1 ON oe.orders (customers_id, sales_rep_id) INVISIBLE;
SQL> CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customers_id, sales_rep_id);
Which two statement are correct?
A. Both the indexes are updated when a new row is inserted, updated, or deleted In the orders table.
B. Both the indexes are created; however, only the ORD_COSTOMER index is visible.
C. Only the ORD_CUSTOMER_IX1 index is created.
D. Only the ORD_CUSTOMER_IX2 index is created.
E. The optimizer evaluates index access from both the Indexes before deciding on which index to use
for query execution plan.
Answer: A,B
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Explanation:
11G has a new feature called Invisible Indexes. An invisible index is invisible to the optimizer as
default. Using this feature we can test a new index without effecting the execution plans of the
existing sql statements or we can test the effect of dropping an index without dropping it.
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