1Z0-182 Exam Questions and Answers | Exam-Dumps.net (Page: 1)

QUESTION: 1

Examine this command: ALTER DATABASE MOVE DATAFILE '/u01/sales01.dbf' TO '/u02/sales02.dbf'; Which two statements are true?

DML may be performed on tables with one or more extents in this data file during the execution of this command.
It overwrites any existing file with the name sales02.dbf in /u02 by default.
The "TO" clause containing the new file name must be specified even if Oracle Managed Files (OMF) is used.
Compressed objects in sales01.dbf will be uncompressed in sales02.dbf after the move.
Tables with one or more extents in this data file may be queried during the execution of this command.

Answer(s): A,E

Explanation:

The ALTER DATABASE MOVE DATAFILE command relocates a data file to a new location while the database remains online, introduced in Oracle 12c and enhanced in subsequent releases like 23ai.
Let's evaluate each option:
A . DML may be performed on tables with one or more extents in this data file during the execution of this command.True. The move operation is online by default in Oracle 23ai, allowing DML (INSERT, UPDATE, DELETE) operations on tables within the data file being moved. The database ensures consistency using redo and undo mechanisms.
B . It overwrites any existing file with the name sales02.dbf in /u02 by default.False. By default, the command does not overwrite an existing file unless the REUSE clause is specified (e.g., ALTER DATABASE MOVE DATAFILE ... REUSE). Without it, the command fails if the target file exists. C . The "TO" clause containing the new file name must be specified even if Oracle Managed Files (OMF) is used.False.
When OMF is enabled (via DB_CREATE_FILE_DEST), the TO clause is optional. If omitted, Oracle automatically generates a file name and places it in the OMF destination. D . Compressed objects in sales01.dbf will be uncompressed in sales02.dbf after the move.False. The move operation is a physical relocation of the data file; it does not alter the logical structure or compression state of objects within it. Compressed data remains compressed.

E . Tables with one or more extents in this data file may be queried during the execution of this command.True. The online nature of the move allows queries (SELECT statements) to proceed without interruption, leveraging Oracle's multi-version consistency model.

Reference:

Oracle Database Administrator's Guide 23ai, Chapter "Managing Data Files and Temp Files," Section "Moving Data Files Online."

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QUESTION: 2

You execute this command: CREATE SMALLFILE TABLESPACE sales DATAFILE '/u01/app/oracle/sales01.dbf' SIZE 5G SEGMENT SPACE MANAGEMENT AUTO; Which two statements are true about the SALES tablespace?

Free space is managed using freelists.
It uses the database default block size.
It must be smaller than the smallest BIGFILE tablespace.
It is a locally managed tablespace.
Any data files added to the tablespace must have a size of 5 gigabytes.

Answer(s): B,D

Explanation:

A . Free space is managed using freelists.False. The SEGMENT SPACE MANAGEMENT AUTO clause specifies Automatic Segment Space Management (ASSM), which uses bitmaps to track free space, not freelists (used in Manual Segment Space Management). B . It uses the database default block size.True. The BLOCKSIZE clause is not specified in the command, so the tablespace inherits the database's default block size (typically 8K unless altered via DB_BLOCK_SIZE).
C . It must be smaller than the smallest BIGFILE tablespace.False. There's no such restriction; SMALLFILE and BIGFILE tablespaces differ in structure (multiple vs. single data file), not mandated size relationships.
D . It is a locally managed tablespace.True. In Oracle 23ai, all tablespaces created without an explicit EXTENT MANAGEMENT DICTIONARY clause are locally managed by default, using extent allocation bitmaps in the data file headers.
E . Any data files added to the tablespace must have a size of 5 gigabytes.False. The initial data file is 5G, but additional data files can have different sizes when added using ALTER TABLESPACE ... ADD DATAFILE.

Reference:

Oracle Database SQL Language Reference 23ai, "CREATE TABLESPACE" syntax; Oracle Database Administrator's Guide 23ai, "Managing Tablespaces."

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QUESTION: 3

Your data center uses Oracle Managed Files (OMF) for all databases. All tablespaces are smallfile tablespaces. SALES_Q1 is a permanent user-defined tablespace in the SALES database. The following command is about to be issued by a DBA logged in to the SALES database: ALTER TABLESPACE sales_q1 ADD DATAFILE; Which two actions independently ensure that the command executes successfully?

Specify a path in the DATAFILE clause of the command specifying a location with at least 100 MB of available space.
Add the AUTOEXTEND ON clause with NEXT set to 100M.
Ensure that DB_RECOVERY_FILE_DEST and DB_CREATE_FILE_DEST each specify locations with at least 50 MB of available space.
Ensure that DB_CREATE_FILE_DEST specifies a location with at least 100 MB of available space.
Ensure that DB_RECOVERY_FILE_DEST and DB_CREATE_FILE_DEST each specify locations with at least 50 MB of available space.

Answer(s): C,D

Explanation:

With OMF enabled, Oracle automatically manages file creation. The command ALTER TABLESPACE sales_q1 ADD DATAFILE without a file specification relies on initialization parameters:
A . Specify a path in the DATAFILE clause ... with at least 100 MB of available space.False. With OMF, explicitly specifying a path overrides OMF behavior, but it's not required for success if OMF parameters are set correctly.
B . Add the AUTOEXTEND ON clause with NEXT set to 100M.False. AUTOEXTEND is optional and affects file growth, not the initial creation success, which depends on available space in the OMF location.
C . Ensure that DB_RECOVERY_FILE_DEST and DB_CREATE_FILE_DEST each specify locations with at least 50 MB of available space.True. If both parameters are set,Oracle may use either for data files (depending on context), and sufficient space (e.g., 50 MB minimum for a smallfile) ensures success. D . Ensure that DB_CREATE_FILE_DEST specifies a location with at least 100 MB of available space.True. This is the primary OMF parameter for data files; sufficient space (typically 100 MB minimum for a new file) guarantees the command succeeds. E . Ensure that DB_RECOVERY_FILE_DEST and DB_CREATE_FILE_DEST each specify locations with at least 50 MB of available space.False. This is redundant with C; only one needs sufficient space, though C's phrasing makes it a valid independent action.

Reference:

Oracle Database Administrator's Guide 23ai, "Using Oracle Managed Files."

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QUESTION: 4

Which three are benefits of using temp UNDO when performing DML on global temporary tables?

It permits DML on global temporary tables even if the database is opened read-only.
It reduces the amount of UNDO stored in the UNDO tablespace.
It reduces I/Os to the SYSTEM tablespace.
It reduces the amount of redo generated.
It reduces I/Os to the SYSAUX tablespace.

Answer(s): B,C,D

Explanation:

Temp UNDO, introduced in Oracle 12c and refined in 23ai, stores undo for global temporary tables (GTTs) in temporary tablespaces:
A . It permits DML on GTTs even if the database is opened read-only.False. In read-only mode, DML on GTTs is allowed regardless of temp UNDO, as GTT data is session-private, but temp UNDO doesn't specifically enable this.
B . It reduces the amount of UNDO stored in the UNDO tablespace.True. Temp UNDO stores undo in the temporary tablespace, reducing usage of the permanent UNDO tablespace. C . It reduces I/Os to the SYSTEM tablespace.True. By avoiding permanent undo, it reduces metadata updates in the SYSTEM tablespace related to undo management. D . It reduces the amount of redo generated.True. Temp UNDO changes are not redo-logged to the same extent as permanent undo, minimizing redo generation. E . It reduces I/Os to the SYSAUX tablespace.False. SYSAUX is unrelated to undo management; temp UNDO affects temporary and SYSTEM tablespaces.

Reference:

Oracle Database Concepts 23ai, "Temporary Undo."

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QUESTION: 5

You want to view the initialization parameter settings for only a specific PDB. Which of the following statements is true?

From the PDB, execute SELECT db_uniq_name, pdb_uid, name, value$ FROM pdb_spfile$;
From the CDB root, execute SELECT NAME, VALUE, ISPDB_MODIFIABLE FROM v$parameter;
From the CDB root, execute SELECT db_uniq_name, pdb_uid, name, value$ FROM pdb_spfiles;
From the PDB, execute SELECT NAME, VALUE, ISPDB_MODIFIABLE FROM v$parameter;

Answer(s): D

Explanation:

A .Incorrect syntax and view (pdb_spfile$ is not a valid view; PDB_SPFILE$ exists but lacks value$). B .From CDB root, V$PARAMETER shows all parameters, not PDB-specific ones. C .pdb_spfiles is not a valid view; PDB_SPFILE$ exists but requires scoping to a PDB.

D .True. From the PDB, V$PARAMETER shows parameters specific to that PDB, including inherited and PDB-modified values, with ISPDB_MODIFIABLE indicating alterability.

Reference:

Oracle Multitenant Administrator's Guide 23ai, "Managing PDB Initialization Parameters."

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QUESTION: 6

Which three statements are true about UNDO and REDO?

REDO is used for read consistency.
UNDO is used for some flashback operations.
UNDO is used for read consistency.
Both REDO and UNDO can be multiplexed.
REDO is used for ROLLBACK.
REDO is used for instance recovery.

Answer(s): B,C,F

Explanation:

A . REDO is used for read consistency.False. Read consistency is achieved using UNDO, which provides a consistent view of data as of a specific point in time. REDO logs changes for recovery, not consistency.
B . UNDO is used for some flashback operations.True. Flashback features like Flashback Query and Flashback Table rely on UNDO to reconstruct past states of data. C . UNDO is used for read consistency.True. UNDO stores pre-change data, enabling multi-version read consistency for queries.
D . Both REDO and UNDO can be multiplexed.False. REDO logs can be multiplexed (mirrored across multiple destinations), but UNDO is managed within a single UNDO tablespace per instance (though it can have multiple data files).
E . REDO is used for ROLLBACK.False. ROLLBACK uses UNDO to revert changes; REDO logs the changes but isn't used to undo them.
F . REDO is used for instance recovery.True. REDO logs are replayed during instance recovery to reapply committed changes after a crash.

Reference:

Oracle Database Concepts 23ai, "Undo and Redo Data"; Oracle Database Administrator's Guide 23ai, "Managing Undo."

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QUESTION: 7

Examine this command: SQL> ALTER TABLE ORDERS SHRINK SPACE COMPACT; Which two statements are true?

Dependent indexes become UNUSABLE.
The SHRINK operation causes rows to be moved to empty space starting toward the end of the ORDERS segment.
Only queries are allowed on ORDERS while SHRINK is executing.
The high-water mark (HWM) of ORDERS is adjusted.
Queries and DML statements are allowed on ORDERS while the SHRINK is executing.
The SHRINK operation causes rows to be moved to empty space starting from the beginning of the ORDERS segment.

Answer(s): E,F

Explanation:

A . Dependent indexes become UNUSABLE.False. SHRINK SPACE COMPACT does not affect index usability; only SHRINK SPACE without COMPACT may require index maintenance if CASCADE is omitted.
B . ... starting toward the end of the ORDERS segment.False. Rows are compacted toward the beginning of the segment, not the end.
C . Only queries are allowed ...False. Both queries and DML are allowed during SHRINK SPACE COMPACT as it's an online operation.
D . The high-water mark (HWM) of ORDERS is adjusted.False. COMPACT moves rows but doesn't adjust the HWM; the full SHRINK SPACE command is needed for HWM adjustment. E . Queries and DML statements are allowed ...True. This is an online operation in 23ai, allowing concurrent access.
F . ... starting from the beginning of the ORDERS segment.True. Rows are moved to fill free space from the segment's start.

Reference:

Oracle Database SQL Language Reference 23ai, "ALTER TABLE ... SHRINK SPACE."

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QUESTION: 8

Which three statements are true about Oracle Managed Files (OMF)?

If DB_RECOVERY_FILE_DEST is specified but DB_CREATE_ONLINE_LOG_DEST_n is not, the redo logs and control files are placed in DB_RECOVERY_FILE_DEST by default.
If only DB_CREATE_FILE_DEST is specified, only data files and temp files are Oracle managed.
If DB_CREATE_ONLINE_LOG_DEST_1 is specified but DB_CREATE_FILE_DEST is not, new data files and temp files are stored in DB_CREATE_ONLINE_LOG_DEST_1 by default.
If DB_CREATE_FILE_DEST is specified but DB_CREATE_ONLINE_LOG_DEST_n is not, new redo logs and control files are stored in DB_CREATE_FILE_DEST by default.
If only DB_CREATE_ONLINE_LOG_DEST_1 is specified, only redo logs and control files are Oracle Managed.
If DB_RECOVERY_FILE_DEST is specified, at least two different locations must be specified for DB_CREATE_ONLINE_LOG_DEST_n.

Answer(s): A,C,D

Explanation:

A .True. Without DB_CREATE_ONLINE_LOG_DEST_n, redo logs and control files default to DB_RECOVERY_FILE_DEST.

B .False. If only DB_CREATE_FILE_DEST is set, redo logs and control files also use it unless overridden. C .True. DB_CREATE_ONLINE_LOG_DEST_1 becomes the default for data files and temp files if DB_CREATE_FILE_DEST is unset.
D .True. DB_CREATE_FILE_DEST serves as the default for all file types if no log-specific parameter is set.
E .False. Data files and temp files would also use DB_CREATE_ONLINE_LOG_DEST_1 if no other parameter is specified.
F .False. No such requirement exists; DB_RECOVERY_FILE_DEST operates independently.

Reference:

Oracle Database Administrator's Guide 23ai, "Using Oracle Managed Files."

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Oracle 1Z0-182 Exam (page: 1)
Oracle Database 23ai Administration Associate
Updated on: 28-Sep-2025

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Oracle 1Z0-182 Exam (page: 1)
Oracle Database 23ai Administration Associate
Updated on: 28-Sep-2025