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1z0-497 Oracle Database 12c Essentials Free Practice Exam Questions (2025 Updated)

Prepare effectively for your Oracle 1z0-497 Oracle Database 12c Essentials certification with our extensive collection of free, high-quality practice questions. Each question is designed to mirror the actual exam format and objectives, complete with comprehensive answers and detailed explanations. Our materials are regularly updated for 2025, ensuring you have the most current resources to build confidence and succeed on your first attempt.

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Total 150 questions

Which command do you use to check for block corruption by validating the database?

A.

RMAN> VALIDATE CHECK LOGICAL

B.

RMAN> VALIDATE BACKUP

C.

RMAN> VALIDATE CORRUPT BLOCKS

D.

RMAN> VALIDATE DATABASE

Which is the default port number for Database Express?

A.

7801

B.

5500

C.

2243

D.

1521

E.

22

Examine the output:

SQL> SELECT index_name, status FROM dba_indexes WHEREstatus='UNUSABLE’;

INDEX_NAME STATUS

--------------------- -----------------

EIND UNUSABLE

Which two statements about this index are true?

A.

It is ignored by the query optimizer.

B.

It is not used while the index is being rebuilt.

C.

The index cannot be rebuilt, and has to be re-created.

D.

The index is automatically rebuilt when used the next time.

Which three operations can the PUBLIC user with the SYSOPER privilege perform?

A.

STARTUP

B.

SHUTDOWN

C.

CREATE DATABASE

D.

DROP DATABASE

E.

ALTER DATABASE RECOVER

Which three DBA operations can be performed by using Oracle SQL Developer?

A.

database backup and recovery using RMAN

B.

performance tuning operations such as generation of AWR, ADDM, and ASH reports

C.

storage configuration for archive logs and control files

D.

storage configuration for data files and redo log groups

E.

database status view and Data Pump export and import jobs

In Oracle Database 12c, when does a transaction begin?

A.

when a transaction ID is allocated for it.

B.

when a user explicitly issues a "begin" statement

C.

when a transaction is assigned to an available undo data segment to record undo entries for the new transaction

D.

when the first executable SQL statement is encountered

You connect to a database instance and execute a DML command that changes one data block. The block is read from the buffer cache, modified, and modified, and marked as dirty. You commit the transaction. What must take place before the block can be written to disk?

A.

The buffer must be written to flash cache.

B.

A log writer (LGWR) must write all redo entries that have been copied into the buffer since the last time it wrote.

C.

The modified data block must be moved from the LRU list to the write queue.

D.

The database must advance the checkpoint.

You need to recover a database running In NOARCHIVELOG mode. Which two statements are true in this scenario?

A.

You can perform complete recovery by using the command:

RESTORE DATABASE

FROM TAG“consistent_whole_backup”;

RECOVER DATABASE;

B.

You can perform incomplete recovery by using the command:

RESTORE DATABASE;

FROM TAG "consistent_whole_backup";

RECOVER DATABASE NOREDO;

C.

Only consistent backups can be used for restoring a database in NOARCHIVELOG mode.

D.

Media recovery is possible in most cases.

You create a CDB with four containers: the loot, the seed, and two pluggable databases PDB1 and PDB2. Which four items can reside In PDB1, but not in the root?

A.

shared UNDO and default database temporary tablespace

B.

Oracle-supplied metadata

C.

shared Oracle-supplied data

D.

CDB views providing information across PDBs

E.

application tablespaces

F.

local temporary tablespaces

G.

local users and local roles

Which two statements about the Process Monitor (PMON) process are true?

A.

PMON performs process recovery when a client process fails.

B.

During instance startup, PMON takes care of instance recovery.

C.

PMON performs listener registration.

D.

PMON restarts background and dispatcher processes when they fail.

E.

PMON resolves failures of distributed transactions.

Which option represents a function of Global Data Services (GDS)?

A.

performs data replication

B.

performs database failovers

C.

replaces the functionality of Oracle Clusterware and Oracle RAC

D.

coordinates site failovers

E.

works seamlessly with Oracle Site Guard

Which is the default isolation level in Oracle Database 12c?

A.

serializable

B.

read-only

C.

read committed

D.

read uncommitted

Examine the table:

Table name: PRODUCTS

Schema: SCOTT

Tablespace: USERS

Organization: Standard (Heap Organized)

This table contains 20 rows. In the data that has been entered, the PROD_ID column contains only single-digit values, PROD_NAME has a maximum of five characters, and PROD_RATE has four-digit values for all rows.

Which two statements are true regarding the modifications that can be performed to the structure of the PRODUCTS table?

A.

PROD_NAME size can be increased from five to 10 characters.

B.

PROD_ID can be changed from CHAR to NUMBER data type.

C.

PROD_RATE size can be changed from NUMBER(4) to NUMBER(6, 2).

D.

New columns can be added only if they have a NOT NULL constraint.

E.

None of the existing columns can be dropped because they contain data.

Which two statements are true about the B-tree Index?

A.

The leaf blocks in the index are doubly linked.

B.

The leaf node stores a bitmap for each key value.

C.

Rows with a NULL value in key columns also have entries in the Index.

D.

The deletion of a row from the table causes a logical deletion in the index leaf block and the space becomes available for a new leaf entry.

Which three statements are true about database storage structures?

A.

A data file can span across tablespaces.

B.

An extent contains one or more segments.

C.

Tablespaces contain one or more data files.

D.

Data objects are stored as segments in tablespaces.

E.

Segments can span across data files within a tablespace.

Which three tasks can you perform in Database Express?

A.

View performance and status information about the database instance.

B.

Start up the database.

C.

Shut down the database.

D.

Create database structures.

E.

Manage users and security.

What happens when you execute these SQL statements?

ALTER SYSTEM SET SGA_TARGET = 992M;

ALTER SYSTEM SET SHARED_POOL_SIZE = 0;

ALTER SYSTEM SET LARGE_POOL_SIZE = 0;

ALTER SYSTEM SET JAVA_POOL_SIZE = 0;

ALTER SYSTEM SET DB_CACHE_SIZE = 0;

ALTER SYSTEM SET STREAMS POOL SIZE = 0;

A.

The database stops (shutdown abort).

B.

B) The database Stops (shutdown immediate).

C.

You activate Automatic Shared Memory Management.

D.

You get an error message.

For which database operation do you need the database to be in MOUNT state?

A.

renaming the control files

B.

re-creating the control files

C.

dropping a user in your database

D.

dropping a tablespace in your database

E.

configuring the database instance to operate in ARCHIVELOG or NOARCHIVELOG mode

What new role in Oracle Database 12c encompasses the administrative privileges required for backup and recovery?

A.

SYSBKP

B.

SYSBKPRMAN

C.

SYSRMAN

D.

SYSBACKUP

Your customer is looking for a solution to address these downtime needs:

- Online addition and removal of disks should automatically rebalance data across new storage configurations while storage, database, and applications remain online.

- Dynamically add or remove clustered nodes without disrupting the database or applications.

- Automate the sizing and distribution of shared memory.

- Add a column with a default value without disrupting the database or applications.

- Perform rolling patch upgrades.

Which four would you recommend to address those needs?

A.

Automatic Storage Management (ASM)

B.

Online Data and Application change

C.

Global Data Services (GDS)

D.

Real Application Clusters (RAC)

E.

Oracle Streams

F.

Online Table Redefinition

G.

Oracle Database Vault

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