Ultimate Guide to Prepare 1Z0-083 Certification Exam for Oracle Database 19c in 2025
Use Real 1Z0-083 Dumps - Oracle Correct Answers updated on 2025
To prepare for the Oracle 1Z1-083 exam, candidates should have a deep understanding of Oracle Database architecture and administration. They should be familiar with the latest features and enhancements in Oracle Database 19c and be able to perform common administrative tasks such as creating and managing databases, configuring database security, and troubleshooting common issues. Additionally, candidates should have experience using Oracle tools such as SQL Developer, Enterprise Manager, and Automatic Workload Repository (AWR) reports. Oracle provides a variety of training resources, including instructor-led courses, online training, and certification exam prep materials to help candidates prepare for the exam.
Oracle 1Z0-083 exam is designed to test the candidate's knowledge and skills in a variety of areas related to database administration. These include database security, backup and recovery, performance tuning, and database maintenance. 1Z0-083 exam also covers advanced topics such as high availability, data replication, and database upgrades.
NEW QUESTION # 71
Choose three. Which three are true about a whole database backup?
- A. It always includes all data files, the current control file, the server parameter file, and archived redo logs.
- B. It can consist of either backup sets or image copies. F) It can be inconsistent.
- C. It can be created only by using RMAN.
- D. It can be consistent.
- E. It is the only possible backup type for a database in NOARCHIVELOG mode.
Answer: B,D
NEW QUESTION # 72
To schema owned by the RC12C user. The RCAT11 database contains an Oracle Database version 11g catalog schema owned by the RC11 user in which several databases are registered.
Both the databases are open. You execute the RMAN commands:
RMAN> CONNECT CATALOG rcl2c/passl2c@catdbl2c RMAN> IMPORT CATALOG
rcll/pwdcatll@ractll
Which two tasks are performed as part of the import?
- A. Local and global stored scripts that have the same name as existing scripts in the RC12C catalog are automatically renamed.
- B. Recovery catalog is resynchronized with the control files of the registered databases.
- C. All databases registered in the RC11 catalog are registered in the RC12C catalog.
- D. Databases from the RC12C catalog are implicitly unregistered if the RC11 catalog has registered databases with same name.
- E. Imported databases are unregistered from the RC11 catalog.
Answer: A,C
NEW QUESTION # 73
Which two are true about automatic block repair? (Choose two.)
- A. Real-Time Query must be enabled on a physical standby database for automatic block repair to be done on its primary database.
- B. Real-Time Query must be enabled on a primary database for automatic block repair to be done on any of its physical standby databases.
- C. Automatic block repair can repair blocks with no standby database if DB_BLOCK_CHECKING = TRUE.
- D. It is not possible for media corrupt blocks.
- E. Real-Time Query must be enabled on a physical standby database for automatic block repair to be done on that physical standby database.
Answer: B,E
NEW QUESTION # 74
Which two are true about OS groups and users for Oracle Grid Infrastructure and the Oracle Relational Database Management System (RDBMS)? (Choose two.)
- A. By default, members of the OSASM group can access Automatic Storage Management and RDBMS instances.
- B. The same OSDBA group must be used for Automatic Storage Management and the Oracle Database.
- C. The Oracle Grid Infrastructure owner must have OSOPER, OSBACKUPDBA, and OSKMDBA as secondary groups.
- D. The Oracle Grid Infrastructure owner owns Oracle Restart and Oracle Automatic Storage Management binaries.
- E. The primary group for the Oracle Grid Infrastructure and Oracle Database owners must be the Oracle Inventory group.
- F. The Oracle Grid Infrastructure installation must be owned by the grid user.
Answer: B,C
NEW QUESTION # 75
Choose the best answer. Examine this configuration: 1. CDB1 is a container database. 2. DEFAULT_SHARING is METADATA.
3. APP_ROOT is an application root contained in CDB1. 4. APP_PDB1 is an application PDB contained in APP_ROOT. 5. COMPANYAPP is an application contained in APP_ROOT. 6. EMP is a common table created in APP_ROOT and all its application PDBs, created when version 1.0 of COMPANYAPP was installed. You execute these commands: $ sqlplus sys/ orac1e@localhost:1521/cdb1 as sysdba SQL> ALTER SYSTEM SET DEFAULT_SHARING=DATA; System altered. SQL> ALTER SESSION SET CONTAINER=app_root; Session altered. SQL> ALTER PLUGGABLE DATABASE APPLICATION companyapp BEGIN UPGRADE '1.0' TO '2.0'; pluggable database altered. SQL> ALTER TABLE emp ADD (sal NUMBER NOT NULL) ; Table altered. SQL> ALTER PLUGGABLE DATABASE APPLICATION companyapp END UPGRADE TO '2.0'; Pluggable database altered. SQL> ALTER SESSION SET CONTAINER=app_pdb1; Session altered. SQL> DESC emp; Name Null? Type --------------------------------------------------------------ENO NUMBER ENAME VARCHAR2 (20) SQL> SELECT * FROM emp; ENO ENAME ---------------------------------100 Alan 200 Ben SQL> ALTER PLUGGABLE DATABASE APPLICATION companyapp SYNC; What will be the outcome and why?
- A. It will return an error because EMP is not empty in APP_ROOT.
- B. SAL will be added to APP_PDB1.EMP, with 0 in columns of existing rows.
- C. It will return an error because EMP.SAL is empty in APP_ROOT.
- D. SAL will be added to APP_PDB1.EMP, with NULLs in columns of existing rows.
- E. It will return an error because the SYNC operation is not allowed when constraints are added to common objects.
Answer: A
NEW QUESTION # 76
Oracle Data Redaction is active on the SCOTT.EMP table. You queried the table twice. SQL> SELECT ENAME, SAL, COMM, MGR, HIREDATE FROM EMP WHERE DEPTNO=30; SQL> SELECT ENAME, SAL, COMM, MGR, HIREDATE FROM EMP WHERE DEPTNO=30; Which is guaranteed to be true concerning the redaction policy?
- A. PARTIAL redaction is active on the MGR column.
- B. RANDOM redaction is active on the MGR column
- C. PARTIAL redaction is active of the HIREDATE column.
- D. RANDOM redaction is active on the HIREDATE column
- E. FULL redaction is active on the SAL column
Answer: D
NEW QUESTION # 77
Choose three. Your container database, CDB1, is in local undo mode. You successfully execute this command while connected to CDB1: CREATE PLUGGABLE DATABASE pdb1 ADMIN USER pdb1_admin IDENTIFIED BY pdb123 ROLES= (CONNECT) CREATE_FILE_DEST='/u01/app/oracle/oradata/cdb1/pdb1' ; Which three are true about PDB1?
- A. It has no local users.
- B. It has the same common users defined as does CDB1.
- C. Service PDB1 is created for remote logins to PDB1.
- D. It is in mount state after creation.
- E. It has the same number of roles as CDB1.
- F. It has only local roles.
Answer: B,C,D
NEW QUESTION # 78
Which three are true about Oracle Grid Infrastructure for a Standalone Server?
- A. It requires Oracle ASMLibto manage Automatic Storage Management (ASM) disks.
- B. It requires Oracle ASM Filter Driver (ASMFD) to manage Automatic Storage Management (ASM) disks
- C. It creates one disk group during installation.
- D. Automatic Storage Management (ASM) requires that O/S groups OSASM and OSDBA be assigned as secondary groups for its installation owner.
- E. It requires the operating system oracle_base environment variable to be predefined before installation.
- F. It includes both Oracle Restart and Oracle Automatic Storage Management (ASM) software.
Answer: B,C,F
NEW QUESTION # 79
Which two are true about poorly performing SQL statements and their tuning in Oracle database instances?
- A. The solution that best optimizes one SQL statement can degrade the performance of others.
- B. Poorly performing SQL statements can be tuned automatically by the Oracle server.
- C. SQL statements doing joins always do more physical I/O than single table queries.
- D. SQL statements doing only logical reads never require tuning because they do no physical I/O.
- E. SQL statements performing many physical I/Os can always have their performance improved by creating indexes.
Answer: A,B
NEW QUESTION # 80
Which two are true about Oracle instance recovery?
- A. Recovery begins from the start of any active redo log group or the start of the current log group if no other group is active.
- B. Recovery reads redo until the end of the redo thread, smon rolls back any dead transactions, and then the database is opened.
- C. Recovery begins from the last checkpoint position that was recorded in the control file by the checkpoint process (ckpt).
- D. Recovery begins from the last checkpoint position that was calculated by the Database Writer before instance failure.
- E. Recovery begins from the beginning of the current redo log group.
- F. Recovery reads redo until the end of the redo thread, and then opens the database, smon then rolls back any dead transactions.
Answer: A,C
NEW QUESTION # 81
While backing up to the Oracle Fast Recovery Area (FRA), you determined the backup is taking too long and suspect a performance bottleneck.
Which three are true about diagnosing and tuning these problems? (Choose three.)
- A. If an RMAN BACKUP VALIDATE command takes noticeably less than an actual backup, then write I/O is a likely bottleneck.
- B. Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using synchronous I/O.
- C. If an RMAN BACKUP VALIDATE command takes roughly the same time as an actual backup, then read I/O is a likely bottleneck.
- D. Data files with a high value in V$BACKUP_SYNC_IO.DISCRETE_BYTES_PER_SECOND are a potential performance bottleneck when synchronous I/O is used.
- E. Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using asynchronous I/O/
- F. Data files with a high value in V$BACKUP_ASYNC_IO.SHORT_WAITS are a potential performance bottleneck when asynchronous I/O is used.
- G. If an RMAN BACKUP VALIDATE command takes roughly the same time as an actual backup, then both read and write I/O are likely bottlenecks.
Answer: A,B,D
Explanation:
Reference:
https://web.stanford.edu/dept/itss/docs/oracle/10gR2/backup.102/b14191/rcmtunin003.htm
NEW QUESTION # 82
Which two are true about OS groups and users for Oracle Grid Infrastructure and the Oracle Relational Database Management System (RDBMS)?
- A. By default, members of the OSASM group can access Automatic Storage Management and RDBMS instances.
- B. The same OSDBA group must be used for Automatic Storage Management and the Oracle Database.
- C. The Oracle Grid Infrastructure owner must have OSOPER, OSBACKUPDBA, and OSKMDBA as secondary groups.
- D. The Oracle Grid Infrastructure owner owns Oracle Restart and Oracle Automatic Storage Management binaries.
- E. The primary group for the Oracle Grid Infrastructure and Oracle Database owners must be the Oracle Inventory group.
- F. The Oracle Grid Infrastructure Installation must be owned by the grid user.
Answer: B,F
NEW QUESTION # 83
Which two are true about reclaiming space used by Flashback logs in Oracle Database 19c and later releases? (Choose two.)
- A. Space might be reclaimed automatically when the retention period for Flashback logs is lowered.
- B. Space is always reclaimed automatically when the retention period for Flashback logs is lowered.
- C. Space is only reclaimed when there is space pressure in the Fast Recovery Area. (FRA)
- D. Space is always reclaimed proactively before space pressure occurs.
- E. Space might be reclaimed proactively before space pressure occurs.
Answer: A,C
NEW QUESTION # 84
Examine the command for creating pluggable database PDB2 in container database CDB2.
Select three options, any one of which is required for it to execute successfully. (Choose three.)
- A. Enable only OMF.
- B. Addonly the CREATE_FILE_DEST clause to the statement.
- C. Set the PDB_FILE_NAME_CONVERT parameter and enable OMF.
- D. Set only the PDB_FILE_NAME_CONVERT parameter.
- E. Add the FILE_NAME_CONVERT clause to the statement and enable OracleManaged Files (OMF)
- F. Add the FILE_NAME_CONVERT clause to the statement and set the PDB_FILE_NAME_CONVERT parameter.
Answer: A,B,C
NEW QUESTION # 85
Which four are true about RMAN backup sets? (Choose four.)
- A. A backup set can contain only one backup piece.
- B. Blocks from multiple data files can be contained in one backup piece,
- C. A backup set must be written to disk.
- D. A backup set must be written to media.
- E. A data file can be split into multiple sections stored in different backup sets.
- F. Blocks from multiple data files can be contained in one backup set,
- G. A data file can be split into multiple sections stored in different backup pieces in the same backup set.
- H. A backup piece can belong to only one backup set.
Answer: B,F,G,H
Explanation:
A backup set contains one or more binary files in an RMAN-specific format. Each of these files is known as a backup piece. A backup set can contain multiple datafiles. For example, you can back up 10 datafiles into a single backup set consisting of a single backup piece.
NEW QUESTION # 86
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