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Oracle Interview Questions for Experienced: Part – 1

Oracle Interview Questions for Experienced Part - 1

Oracle Interview Questions for Experienced Part 1

1. What are the various modules in Oracle forms?

Oracle Forms typically consist of four main modules: the Menu module, the Canvas module, the PL/SQL library module, and the Object Library module.

2. What is the definition of a "snapshot" in the context of the Oracle database?

A snapshot in the Oracle database refers to a read-only, static view of a set of data from a specific point in time. It enables querying of consistent data without being affected by concurrent changes.

3. How many memory layers does the Oracle shared pool consist of?

The Oracle shared pool consists of two memory layers: the Library Cache and the Data Dictionary Cache.

4. Could you explain the concepts of "save point" and "hash cluster" within the Oracle database?

In Oracle, a save point marks a specific point in a transaction to which you can roll back if necessary. A hash cluster is a method of storing table data to improve retrieval by hashing the rows and storing similar rows together.

5. What are the various types of objects present in an Oracle database?

Oracle database objects include tables, views, indexes, sequences, synonyms, procedures, functions, triggers, and packages.

6. Enumerate the differences between pre-select and pre-query.

Pre-select triggers in Oracle Forms fire before the record is retrieved from the database, while pre-query triggers fire before the query is executed but after the record is fetched from the database.

7. What is a synonym? Can you create a synonym without a table?

A synonym is an alias for a table, view, sequence, procedure, or other schema objects. Yes, you can create a synonym without a table by associating it with another object or even an empty schema.

8. Enumerate the different types of synonyms in Oracle and describe their respective uses.

In Oracle, private synonyms are accessible only to the owner, while public synonyms are accessible to all users. Synonyms simplify access to objects by providing an alternate name for the object.

9. Explain the significance of the control file in Oracle database management.

The control file in Oracle stores metadata crucial for database operations, including database name, data file names and locations, log sequence numbers, and backup information.

10. What does BLOB data type mean in Oracle?

BLOB stands for Binary Large Object, representing a data type used to store binary data, such as images, audio, or video, within the Oracle database.

In conclusion,​

Oracle interview questions for experienced professionals aim to delve into various aspects of Oracle database management and development. From exploring database objects and memory structures like the shared pool to understanding crucial concepts like save points and control files, these questions offer a comprehensive view of the candidate’s expertise. Mastery of topics such as parameter handling, snapshots, and data conversion further demonstrates a candidate’s proficiency in Oracle database systems. Part – 1 of this series provides a solid foundation for assessing an experienced candidate’s knowledge, setting the stage for a deeper dive into more advanced topics in subsequent parts.

Ready to take your Oracle skills to the next level? Explore our top-notch Oracle Training in Chennai. Our expert instructors and hands-on approach ensure that you not only ace interviews but also thrive in real-world scenarios. To kickstart your journey to Oracle excellence, contact us at +91 9655-333-334. Secure your future today with the best Oracle Training in Chennai. Don’t miss out on the chance to propel your career forward!

Oracle Interview Questions for Experienced: Part – 2

Categories
oracle

Oracle Interview Questions for Experienced: Part – 2

Oracle Interview Questions for Experienced Part - 2

Oracle Interview Questions for Experienced Part 2

11. How does a post-database commit differ from a post-form commit in Oracle?

A post-database commit trigger fires after changes are committed to the database, while a post-form commit trigger fires after changes are committed within the current form session but before the changes are committed to the database.

12. What is a logical backup?

A logical backup involves exporting data from the Oracle database using utilities like Data Pump or Export, creating a logical representation of the database objects that can be imported back into the database.

13. What is redo log file mirroring in Oracle?

Redo log file mirroring in Oracle involves creating identical copies of redo log files to enhance fault tolerance and protect against loss of data due to a failure of the redo log file group.

14. What are recursive hints in Oracle?

Recursive hints in Oracle, like /*+ NOREWRITE */, prevent the optimizer from applying query rewrite transformations, ensuring that certain queries are not rewritten for optimization purposes.

15. State the limitations of the CHECK constraint.

CHECK constraints in Oracle have limitations such as not allowing subqueries or referring to other columns in the same table, limiting their complexity compared to other constraints.

16. How would you convert a date to a char in Oracle? Explain with an example.

To convert a date to a character in Oracle, you can use the TO_CHAR function. For instance:

SQL

 

SELECT TO_CHAR(sysdate, ‘DD-MON-YYYY HH:MI:SS’) FROM dual;

17. Can you differentiate between formal and actual parameters in programming contexts?

Formal parameters are placeholders in a function or procedure definition, while actual parameters are the values passed to those parameters when the function or procedure is called.

18. What extensions do Oracle reports use?

Oracle Reports commonly use the .rdf (Report Definition File) extension for report definition files and the .rep (Report Output) extension for generated report output files.

19. What steps would you take to convert a string into a date format within the Oracle database?

To convert a string to a date in Oracle, use the TO_DATE function, specifying the format of the input string. For example:

SQL

 

SELECT TO_DATE(‘2023-12-26’, ‘YYYY-MM-DD’) FROM dual;

20. How would you find the current time and date in Oracle?

You can retrieve the current date and time in Oracle using the SYSDATE function. For instance:

SQL

 

SELECT SYSDATE FROM dual;

21. What is the use of the following options in the IMP command: ROWS, GRANT, INDEXES, IGNORE, SHOW, FILE param?

  • ROWS: Specifies the number of rows to import.
  • GRANT: Imports object grants along with the data.
  • INDEXES: Imports indexes along with the table data.
  • IGNORE: Ignores creation errors during import.
  • SHOW: Displays the SQL statements without actually performing the import.
  • FILE param: Specifies the file from which import parameters are taken.

In conclusion,​

second part of Oracle Interview Questions for Experienced delves deeper into the intricate aspects of Oracle databases. It explores fundamental concepts like snapshots, memory structures, database objects, and transaction management, shedding light on the nuanced functionalities within an Oracle environment. Additionally, it touches upon crucial elements such as control files, parameter distinctions, and data conversion techniques, providing a comprehensive view of the knowledge base expected from experienced Oracle professionals. Mastering these aspects not only showcases expertise but also demonstrates a robust understanding of Oracle’s complexities, vital for navigating real-world database challenges effectively.

Ready to take your Oracle skills to the next level? Explore our top-notch Oracle Training in Chennai. Our expert instructors and hands-on approach ensure that you not only ace interviews but also thrive in real-world scenarios. To kickstart your journey to Oracle excellence, contact us at +91 9655-333-334. Secure your future today with the best Oracle Training in Chennai. Don’t miss out on the chance to propel your career forward!

Oracle Interview Questions for Experienced: Part – 1

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