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試験科目:「Java SE 8 Programmer II」
問題と解答:全128問 1z0-809受験対策

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試験科目:「Upgrade to Oracle Database 12c」
問題と解答:全150問 1Z0-060試験問題解説集

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試験科目:「Oracle Database 11g: Program with PL/SQL (1Z0-144日本語版)」
問題と解答:全103問 1Z0-144日本語テキスト

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NO.1 Which two statements are true about Oracle Managed Files (OMF)?
A. OMF can be used with ASM disk groups, as well as with raw devices, for better file management.
B. The file system directions that are specified by OMF parameters are created automatically.
C. OMF may affect the location of the redo log files and archived log files.
D. OMF automatically creates unique file names for table spaces and control files.
E. OMF cannot be used in a database that already has data files created with user-specified
Answer: C,D

D: The database internally uses standard file system interfaces to create and delete files as needed
for the following database structures:
Tablespaces Redo log files Control files Archived logs Block change tracking files Flashback logs RMAN
* Using Oracle-managed files simplifies the administration of an Oracle Database. Oracle-managed
files eliminate the need for you, the DBA, to directly manage the operating system files that make up
an Oracle Database. With Oracle-managed files, you specify file system directories in which the
database automatically creates, names, and manages files at the database object level. For example,
you need only specify that you want to create a tablespace; you do not need to specify the name and
path of the tablespace's datafile with the DATAFILE clause. Reference: What Are Oracle-
Managed Files?

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. Only the ORD_CUSTOMER_IX2 index is created.
B. Only the ORD_CUSTOMER_IX1 index is created.
C. Both the indexes are created; however, only the ORD_COSTOMER index is visible.
D. Both the indexes are updated when a new row is inserted, updated, or deleted In the orders table.
E. The optimizer evaluates index access from both the Indexes before deciding on which index to use
for query execution plan.
Answer: C,D
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.

投稿日: 2016/11/2 8:56:03  |  カテゴリー: Oracle  |  タグ: 1z0-809試験合格1Z0-0601Z0-144JOracle