1Z0-006 Oracle Database Architecture Questions and Answers

Question 1

A user connects to an Oracle database and executes a large, complex SQL query that requires significant sorting and hashing operations.
Where is the memory for these user-specific operations primarily allocated?

Accepted Answer

Program Global Area (PGA)

Answer

Shared Pool

Answer

Database Buffer Cache

Answer

Redo Log Buffer

Question 2

Which Oracle background process is responsible for writing modified data blocks (dirty buffers) from the Database Buffer Cache to the physical data files on disk?

Accepted Answer

Database Writer (DBWn)

Answer

Log Writer (LGWR)

Answer

System Monitor (SMON)

Answer

Checkpoint (CKPT)

Question 3

A database administrator is performing a recovery operation and needs to locate all the data files and redo log files. Which physical database structure contains this critical metadata, including the database name and the timestamp of its creation?

Accepted Answer

Control Files

Answer

Parameter File (PFILE/SPFILE)

Answer

Password File

Answer

Data Files

Question 4

Which of the following represents the correct hierarchy of logical storage structures in an Oracle database, from largest to smallest?

Accepted Answer

Tablespace > Segment > Extent > Oracle Block

Answer

Segment > Tablespace > Oracle Block > Extent

Answer

Oracle Block > Extent > Segment > Tablespace

Answer

Tablespace > Extent > Segment > Oracle Block

Question 5

Following an unexpected server shutdown, an Oracle database instance is restarted. The database automatically begins a process of rolling forward committed changes from the redo logs and rolling back uncommitted transactions. Which background process is primarily responsible for performing this crash recovery?

Accepted Answer

System Monitor (SMON)

Answer

Process Monitor (PMON)

Answer

Archive (ARCn)

Answer

Database Writer (DBWn)

Question 6

When a user issues a `COMMIT` statement for their transaction, which of the following actions is synchronously performed by the Log Writer (LGWR) process to guarantee the durability of the transaction?

Accepted Answer

It writes the transaction's redo entries from the Redo Log Buffer to the online redo log files.

Answer

It immediately writes the modified data blocks from the buffer cache to the data files.

Answer

It cleans up the user's session information in the Program Global Area (PGA).

Answer

It signals the Checkpoint process to update the headers of all data files.