Free 1z0-062: Oracle Database 12c Installation and Administration Exam Questions and Answers
Oracle Database 12c Installation and Administration is part of Oracle Certification from Oracle University. Oracle exam codes begin 1Z0-, and modern ones end in the release year, so 1Z0-1085-26 is the 2026 release of OCI Foundations Associate. The least-known rule is the update path: a Delta exam swaps the prefix to 1D0- and appends -D while keeping the same family number, so 1Z0-1058-26 renews through 1D0-1058-26-D.
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Last updated: September 19, 2026
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Question #1
Which action takes place when a file checkpoint occurs?
Please select an optionIncorrectCorrect answer: B
A file checkpoint affects one datafile only: DBWn writes the buffers for that file that were dirtied before the checkpoint SCN, and the checkpoint SCN for the file is recorded in the control file.
Was this answer correct?Question #2
You configure your database Instance to support shared server connections. Which two memory areas that are part of PGA are stored in SGA instead, for shared server connection? (Choose two.)
Select 2 answers.
Please select an optionIncorrectCorrect answer: C, E
A: PGA itself is subdivided. The UGA (User Global Area) contains session state information, including stuff like package-level variables, cursor state, etc. Note that, with shared server, the UGA is in the SGA. It has to be, because shared server means that the session state needs to be accessible to all server processes, as any one of them could be assigned a particular session. However, with dedicated server (which likely what you're using), the UGA is allocated in the PGA. C: The Location of a private SQL area depends on the type of connection established for a session. If a session is connected through a dedicated server, private SQL areas are located in the server process’ PGA. However, if a session is connected through a shared server, part of the private SQL area is kept in the SGA. Note: * System global area (SGA) The SGA is a group of shared memory structures, known as SGA components, that contain data and control information for one Oracle Database instance. The SGA is shared by all server and background processes. Examples of data stored in the SGA include cached data blocks and shared SQL areas. * Program global area (PGA) A PGA is a memory region that contains data and control information for a server process. It is nonshared memory created by Oracle Database when a server process is started. Access to the PGA is exclusive to the server process. There is one PGA for each server process. Background processes also allocate their own PGAs. The total memory used by all individual PGAs is known as the total instance PGA memory, and the collection of individual PGAs is referred to as the total instance PGA, or just instance PGA. You use database initialization parameters to set the size of the instance PGA, not individual PGAs. References:
Was this answer correct?Question #3
Which are two ways for a database service to be recognized by a listener in Oracle Database 12c? (Choose two.)
Select 2 answers.
Please select an optionIncorrectCorrect answer: A, E
Reference: https://docs.oracle.com/database/121/NETAG/listenercfg.htm#NETAG298
Was this answer correct?Question #4
You execute the following PL/SQL: Which two statements are true? (Choose two.)
Select 2 answers.
Please select an optionIncorrectCorrect answer: A, D
DBMS_FGA.add_policy * The DBMS_FGA package provides fine-grained security functions. * ADD_POLICY Procedure This procedure creates an audit policy using the supplied predicate as the audit condition. Incorrect: Not C: object_schema The schema of the object to be audited. (If NULL, the current log-on user schema is assumed.)
Was this answer correct?Question #5
Examine the contents of SQL loader control file: Which three statements are true regarding the SQL* Loader operation performed using the control file? (Choose three.)
Select 3 answers.
Please select an optionIncorrectCorrect answer: B, D, E
A: The APPEND keyword tells SQL*Loader to preserve any preexisting data in the table. Other options allow you to delete preexisting data, or to fail with an error if the table is not empty to begin with. B (not D): Note: * SQL*Loader-00210: first data file is empty, cannot process the FIELD NAMES record Cause: The data file listed in the next message was empty. Therefore, the FIELD NAMES FIRST FILE directive could not be processed. Action: Check the listed data file and fix it. Then retry the operation E: * A comma-separated values (CSV) (also sometimes called character-separated values, because the separator character does not have to be a comma) file stores tabular data (numbers and text) in plain-text form. Plain text means that the file is a sequence of characters, with no data that has to be interpreted instead, as binary numbers. ACSV file consists of any number of records, separated by line breaks of some kind; each record consists of fields, separated by some other character or string, most commonly a literal comma or tab. Usually, all records have an identical sequence of fields. * Fields with embedded commas must be quoted. Example: 1997,Ford,E350,"Super, luxurious truck" Note: * SQL*Loader is a bulk loader utility used for moving data from external files into the Oracle database.
Was this answer correct?Question #6
Examine the current value for the following parameters in your database instance: SGA_MAX_SIZE = 1024M SGA_TARGET = 700M DB_8K_CACHE_SIZE = 124M LOG_BUFFER = 200M You issue the following command to increase the value of DB_8K_CACHE_SIZE: SQL> ALTER SYSTEM SET DB_8K_CACHE_SIZE=140M; Which statement is true?
Please select an optionIncorrectCorrect answer: B
* The SGA_TARGET parameter can be dynamically increased up to the value specified for the SGA_MAX_SIZE parameter, and it can also be reduced. * Example: For example, suppose you have an environment with the following configuration: SGA_MAX_SIZE = 1024M SGA_TARGET = 512M DB_8K_CACHE_SIZE = 128M In this example, the value of SGA_TARGET can be resized up to 1024M and can also be reduced until one or more of the automatically sized components reaches its minimum size. The exact value depends on environmental factors such as the number of CPUs on the system. However, the value of DB_8K_CACHE_SIZE remains fixed at all times at 128M * DB_8K_CACHE_SIZE Size of cache for 8K buffers * For example, consider this configuration: SGA_TARGET = 512M DB_8K_CACHE_SIZE = 128M In this example, increasing DB_8K_CACHE_SIZE by 16 M to 144M means that the 16M is taken away from the automatically sized components. Likewise, reducing DB_8K_CACHE_SIZE by 16M to 112M means that the 16M is given to the automatically sized components.
Was this answer correct?Question #7
After implementing full Oracle Data Redaction, you change the default value for the NUMBER data type as follows: After changing the value, you notice that FULL redaction continues to redact numeric data with zero. What must you do to activate the new default value for numeric full redaction?
Please select an optionIncorrectCorrect answer: E
About Altering the Default Full Data Redaction Value You can alter the default displayed values for full Data Redaction polices. By default, 0 is the redacted value when Oracle Database performs full redaction (DBMS_REDACT.FULL) on a column of the NUMBER data type. If you want to change it to another value (for example, 7), then you can run the DBMS_REDACT.UPDATE_FULL_REDACTION_VALUES procedure to modify this value. The modification applies to all of the Data Redaction policies in the current database instance. After you modify a value, you must restart the database for it to take effect. Note: * The DBMS_REDACT package provides an interface to Oracle Data Redaction, which enables you to mask (redact) data that is returned from queries issued by low-privileged users or an application. * UPDATE_FULL_REDACTION_VALUES Procedure This procedure modifies the default displayed values for a Data Redaction policy for full redaction. * After you create the Data Redaction policy, it is automatically enabled and ready to redact data. * Oracle Data Redaction enables you to mask (redact) data that is returned from queries issued by low-privileged users or applications. You can redact column data by using one of the following methods: / Full redaction. / Partial redaction. / Regular expressions. / Random redaction. / No redaction.
Was this answer correct?Question #8
Examine the resources consumed by a database instance whose current Resource Manager plan is displayed. Which two statements are true? (Choose two.)
Select 2 answers.
Please select an optionIncorrectCorrect answer: C, E
CPU_WAIT_TIME reports only the time sessions were held back by Resource Manager scheduling, not waits for I/O or contention. When a group's active session limit is reached, new sessions are queued rather than failing with an error.
Was this answer correct?Question #9
You administer an online transaction processing (OLTP) system whose database is stored in Automatic Storage Management (ASM) and whose disk group use normal redundancy. One of the ASM disks goes offline, and is then dropped because it was not brought online before DISK_REPAIR_TIME elapsed. When the disk is replaced and added back to the disk group, the ensuing rebalance operation is too slow. Which two recommendations should you make to speed up the rebalance operation if this type of failure happens again? (Choose two.)
Select 2 answers.
Please select an optionIncorrectCorrect answer: A, D
A: ASM_POWER_LIMIT specifies the maximum power on an Automatic Storage Management instance for disk rebalancing. The higher the limit, the faster rebalancing will complete. Lower values will take longer, but consume fewer processing and I/O resources. D: * Normally a separate process is fired up to do that rebalance. This will take a certain amount of time. If you want it to happen faster, fire up more processes. You tell ASM it can add more processes by increasing the rebalance power. * ASMB ASM Background Process Communicates with the ASM instance, managing storage and providing statistics Incorrect: Not B: A higher, not a lower, value of DISK_REPAIR_TIME would be helpful here. Not E: If you implement database writer I/O slaves by setting the DBWR_IO_SLAVES parameter, you configure a single (master) DBWR process that has slave processes that are subservient to it. In addition, I/O slaves can be used to "simulate" asynchronous I/O on platforms that do not support asynchronous I/O or implement it inefficiently. Database I/O slaves provide non-blocking, asynchronous requests to simulate asynchronous I/O.
Was this answer correct?Question #10
A senior DBA asked you to execute the following command to improve performance: SQL> ALTER TABLE subscribe log STORAGE (BUFFER_POOL recycle); You checked the data in the SUBSCRIBE_LOG table and found that it is a large table containing one million rows. What could be a reason for this recommendation?
Please select an optionIncorrectCorrect answer: D
The most of the rows in SUBSCRIBE_LOG table are accessed once a week.
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- Q1: What is the 1z0-062: Oracle Database 12c Installation and Administration exam?
- A: 1z0-062: Oracle Database 12c Installation and Administration is a Oracle certification exam. Judging by the questions in our bank, it concentrates on three, oracle, PDBS, tablespace and pluggable.
- Q2: What topics does the 1z0-062: Oracle Database 12c Installation and Administration exam cover?
- A: Questions in our 1z0-062: Oracle Database 12c Installation and Administration bank cluster around three, oracle, PDBS, tablespace, pluggable, multitenant, elapsed and sysaux. Working through the full set is the quickest way to find which of these you are weakest on.
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- A: Work through the 1z0-062: Oracle Database 12c Installation and Administration practice questions here, checking your answer on each one, then sit the practice test to rehearse the exam under timed conditions before the real thing.
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- A: They are drawn from officially released past questions and from community members who have sat 1z0-062: Oracle Database 12c Installation and Administration. Answers are verified and updated weekly.
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