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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 statement is true regarding this connect string?

(DESCRIPTION

(FAILOVER=on)

(ADDRESS_LIST=

(LOAD_BALANCE=ON)

(ADDRESS=(host=sales-east1) (port=1522) )

(ADDRESS=(host=sales-east2)(port=1522))

(ADDRESS=(host=sales-east3) (port=1522) ))

(ADDRESS_LIST=

(LOAD_BALANCE=ON)

(ADDRESS=(host=sales-west1) (port=1522) )

(ADDRESS=(host=sales-west2) (port=JS22))

(ADDRESS=(host=sales-west3) (port=lS22) ) )

(CONNECT_DATA=

(SERVICE_NAME=sales)

(REGION=east)))

A.

It contains three global service managers in the client's local region (east).

B.

Client-side load balancing has been enabled only for the global service managers within the client's buddy (west).

C.

Connect-time failover between regions has not been enabled.

D.

The REGION parameter is optional.

The session of user SCOTT receives the following error after executing an UPDATE command on the EMP table:

ERROR at line 1:

ORA-00060: deadlock detected while waiting for resource

You find out that a session opened by user JIM has a transaction that caused the deadlock. Which two statements are true about SCOTT's session in this scenario?

A.

The session is terminated after receiving the error and JIM can continue with his transaction.

B.

SCOTT should perform a COMMIT or ROLLBACK to allow JIM to continue with his transaction.

C.

The session is rolled back after receiving the error and JIM can continue with his transaction.

D.

SCOTT has to re-execute the last command in the transaction after he commits the transaction.

Which normalization level is adopted in real-world database systems?

A.

1NF

B.

2NF

C.

3NF

D.

BCNF

Which two items are key for maintaining data consistency in Oracle Database 12c?

A.

undo data

B.

isolation level

C.

lock mechanism

D.

serializability

Examine the command:

sqlplus /nolog

In which scenario would this command execute successfully?

A.

only from the server, if the database instance is not up

B.

from either a client or server, even if the database instance is not up

C.

from either a client or server, only if the database instance is up, and the command connects the session to the instance

D.

from either a client or server, only if the database instance is up, but the command does not connect the session to the instance

After a ___________ statement is issued, a transaction ends. (select three)

A.

COMMIT

B.

ROLLBACK

C.

SAVEPOINT

D.

SELECT

E.

CREATE

In which situation would you use static database registration for a listener?

A.

when multiple databases are to be registered with the listener

B.

when DBAs need to connect remotely to start up the database instance

C.

when users need to connect the database instance by using the host naming method

D.

when the database instance to be registered with the listener is configured in shared server mode

As part of your Oracle Database 12c post-installation tasks, you run these commands:

Cd $ORACLE_HOME/bin

srvctl stop database -d myDb

chopt enable dm

srvctl start database -d myDb

What does this do?

A.

It enables the Oracle Data Mining option in your Oracle binary files.

B.

It creates the Fast Recovery Area disk group.

C.

It generates Client Static Library.

D.

It configures one of the Oracle user accounts.

E.

It configures Oracle Net Services.

F.

It configures Oracle Messaging Gateway.

A.

Option A

B.

Option B

C.

Option C

D.

Option D

E.

Option E

Which three statements represent the benefits of multitenant architecture for database consolidation?

A.

You can unplug a PDB from a development CDB and plug it into a production CDB, which allows for easier and more rapid movement of data and code.

B.

You can consolidate shared database memory by combining multiple PDBs in a single CDB.

C.

Patching individual PDBs requires the same amount of time as patching individual databases.

D.

Consolidating separate databases into a single CDB requires the same amount of storage allocation.

E.

In multitenant architecture, a PDB behaves the same as a non-CDB as seen from a client connecting with Oracle Net. No client modification is required.

Which two statements about multitenant architecture are true?

A.

It ensures full backward compatibility with non-CDBs.

B.

It fully operates with RAC.

C.

It is integrated with Enterprise Manager, but not with the Resource Manager.

D.

It allows central management and administration of single databases.

Identify the correct order of consolidation density.

A.

multitenant< schema consolidation< dedicated database< VMs

B.

schema consolidation< VMs< dedicated databases< multitenant

C.

dedicated databases< VMs< schema consolidation< multitenant

D.

VMs< dedicated databases< schema consolidation< multitenant

Which two statements are true about a buffer cache?

A.

When a buffer is read from a buffer cache, it may be inconsistent and require undo data to make it consistent.

B.

A buffer cache stores copies of data blocks from all files of the database.

C.

Buffer access is kept efficient by maintaining a least recently used (LRU) list for dirty and clean buffers.

D.

A buffer cache always resides completely in System Global Area (SGA).

E.

A buffer cache contains exactly three pools: default, keep, and recycle pool.

You are about to install Oracle Database 12c Enterprise Edition. Which statement is true?

A.

You should not install the Oracle Database software into an existing Oracle home from a different release.

B.

A multitenant container database (CDB) can have several pluggable databases (PDBs) with different character sets.

C.

Oracle recommends that you back up the root. sh script after you complete the installation.

D.

Cloning an Oracle home is useful if you are performing multiple Oracle Database Installations.

E.

You can stop existing Oracle processes, including the listener and the database running in the Oracle home, before the database software installation.

There are two listeners, LISTENER1 arid LISTENER2, and one service name ORCL available for your database. The database is running and currently, only LISIENER1 is started. You issue the command:

lsnrctl start listener2

What would be the outcome?

A.

It starts the second listener without affecting current sessions.

B.

It starts the second listener and terminates all current sessions.

C.

It gives an error because multiple listeners cannot run simultaneously.

D.

It gives an error because multiple listeners can run simultaneously only if there are multiple net service names.

You are installing OracleDatabase 12c on a machine. When you run the installer; Oracle Universal installer (OUI) shows a message that says one of the product-specific prerequisite checks has failed:

Checking available swap space requirements...

Expected result: 1512MB

Actual Result: 1018MB

Check complete. The overall result of this check is: failed ««

Problem: The system does not have the required swap space.

What happens to the installation in this situation?

A.

It can be continued.

B.

It resizes the swap space automatically when you proceed further.

C.

It can be continued, but the instance cannot be started without increasing swap space.

D.

It shows a message saying one or more prerequisite checks have failed and the installation aborts.

Your customer is looking for a solution that meets these four needs:

1 - Replicate data from source to target for reporting purposes.

2 -Replicate data from one source to multiple targets.

3 - Replicate data between two databases for instant failover.

4 - Replicate data from multiple sources to a single target for a data warehouse.

Which GoldenGate-supported topology would you recommended?

A.

Uni-directional for 1

Peer-to-peer for 2

Bi-directional for 3

Consolidation for 4

B.

Peer-to-peer for 1

Broadcast for 2

Bi-directional for 3

Consolidation for 4

C.

Uni-directional for 1

Broadcast for 2

Bi-directional for 3

Consolidation for 4

D.

Peer-to-peer for 1

Consolidation for 2

Broadcast for 3

Cascading for 4

Your database is down. You log in as the SYS user and issue this command:

SQL> STARTUP

What happens after the instance is started?

A.

Nothing else happens.

B.

The database is mounted but not opened.

C.

The database is mounted and finally opened.

D.

The database is opened and finally mounted.

Real-Time ADDM detects a high-load performance issue within the database. Which condition triggered it?

A.

The average active sessions were more than three times the number of CPU cores.

B.

Active sessions were more than 10% of total load and CPU utilization was more than 50%.

C.

Memory allocations were more than 95% of physical memory.

D.

Hung sessions were more than 10% of total sessions.

E.

A deadlock was detected.

F.

The session limit was close to 100%.

Which statement about a server parameter file (SPFILE) is false?

A.

An SPFILE is a binary file that cannot be edited by using a text editor.

B.

You can create an SPFILE from an existing text initialization parameter file or from memory.

C.

You can use the SHOW PARAMETERS command to display the values of initialization parameters in an SPFILE.

D.

The instance first searches for an SPFILE named spfileoRACLE_SID.ora and, if this is not found. It searches for spfile.ora.

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