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NEW QUESTION: 1
On your Oracle Database, you issue the following commands to create indexes:
SQL > CREATE INDEX oe.ord_customer_ix1 ON oe.orders (customer_id, sales_rep_id) INVISIBLE; SQL> CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customer_id, sales_rep_id); Which two statements are true? (Choose two.)
A. Both the indexes are created: however, only ORD_CUSTOMERS_IX1 is used by the optimizer for queries on the ORDERS table.
B. Both the indexes are created and used by the optimizer for queries on the ORDERS table.
C. Both the indexes are updated when a row is inserted, updated, or deleted in the ORDERS table.
D. Only the ORD_CUSTOMER_IX1 index created.
E. The ORD_CUSTOMER_IX1 index is not used by the optimizer even when the OPTIMIZER_USE_INVISIBLE_INDEXES parameters is set to true.
F. Both the indexes are created: however, only ORD_CUSTOMERS_IX2 is used by the optimizer for queries on the ORDERS table.
Answer: C,F
Explanation:
Explanation/Reference:
Explanation:
Not A: Both indexes are created fine.
B: The invisible index ORD_CUSTOMERS_IX1 and the bitmap index are both updated by DML operations on the Orders table.
F: Since ORD_CUSTOMERS_IX1 is invisible only ORD_CUSTOMERS_IX2 is used by the query optimizer.
Not C,Not D,Not E:
* ord_customer_ix1 is an invisible index and is therefore not used by the optimizer.
* VISIBLE | INVISIBLE Use this clause to specify whether the index is visible or invisible to the optimizer.
An invisible index is maintained by DML operations, but it is not be used by the optimizer during queries unless you explicitly set the parameter OPTIMIZER_USE_INVISIBLE_INDEXES to TRUE at the session or system level.
Note: Specify BITMAP to indicate that index is to be created with a bitmap for each distinct key, rather than indexing each row separately. Bitmap indexes store the rowids associated with a key value as a bitmap.
Each bit in the bitmap corresponds to a possible rowid. If the bit is set, then it means that the row with the corresponding rowid contains the key value. The internal representation of bitmaps is best suited for applications with low levels of concurrent transactions, such as data warehousing.
NEW QUESTION: 2
You decide to create a snapshot of your ACFS for backup and recovery purposes. Which two tools are available to do this?
A. ACFSUTIL
B. ASMCMD
C. Enterprise Manager
D. ADVMUTIL
E. SQL*Plus
Answer: A,C
Explanation:
About Oracle ACFS Snapshots Oracle ACFS snapshots are administered with the acfsutil snap commands. For information about the acfsutil snap commands, refer to "acfsutil snap create", "acfsutil snap delete", and "acfsutil snap info". You can also manage Oracle ACFS snapshots with Oracle Enterprise Manager. For information about using Oracle Enterprise Manager, see "Managing Oracle ACFS Snapshots with Oracle Enterprise Manager".
Oracle@ Automatic Storage Management Administrator's Guide 11g Release 2 (11.2)
NEW QUESTION: 3
A. Option A
B. Option D
C. Option C
D. Option B
Answer: A,D