Oracle Database Interview Questions -PART 1 | sql, plsql, dbms, scenario based interview questions.
- 1. ORACLE DATABASE INTERVIEW QUESTIONS 400+ TOP INTERVIEW QUESTIONS 50+ PERSONAL INTERVIEWS EXPERIENCE SUMMARIZED 30+ TOP MNC AND PRODUCT BASED ORGANIZATIONS EXPERIENCES MERGED SOLUTION TO EVERY QUESTION WITH PROPER EXPLANATIONS SQL, PLSQL, SCENARIO BASED AND DBMS CONCEPTS QUESTIONS COVERED DESGINED FOR FRESHER TO 8 YEARS EXPERIENCED WORKING PROFESSIONAL - best source for interview preparation PART 1 - covering questions 1 to 10 powered by OracleLand
- 3. BEFORE WE START LETS HAVE A LOOK ON BELOW POINTS Question Topics • All questions from SQL, PLSQL and basic DBMS concepts covered. Content • Each question has proper solution and in depth explanation. Question details • Each question has details like experience level, complexity level and probability of being asked in an interview. Question Types • Includes scenario and concept based, complex code writing and YES/ NO questions.
- 5. Q1.WHAT IS DATABASE AND DBMS? PROBABILITY: Medium TYPE: Conceptual EXPERIENCE: Any COMPLEXITY: Low TOPIC: DBMS Explanation: Database: • collection of related data which represents some aspect of the real world can be called as database. DBMS: • it stands for Database Management System. • it is a software for storing and retrieving user's data while considering appropriate security measures. • it also consists of a group of programs which manipulate the database. - ORACLELAND
- 6. Q2.WHAT ARE THE DIFFERENT TYPES OF DBMS? PROBABILITY: Low TYPE: Conceptual EXPERIENCE: Any COMPLEXITY: Low TOPIC: DBMS Explanation: There are four types of DBMS: 1. Hierarchical database. 2. Network database. 3. Relational database. 4. Object-Oriented database. - ORACLELAND
- 7. Q3. WHAT IS DATA INTEGRITY AND HOW IS IT MAINTAINED IN ORACLE? PROBABILITY: Low TYPE: Conceptual EXPERIENCE: Any COMPLEXITY: Low TOPIC: DBMS Explanation: Data Integrity: • Data integrity refers to the accuracy and consistency (validity) of data over its lifecycle. It can be maintained in Oracle by: • enforcing business rules with triggered stored procedures. • using stored procedures to completely control data access. • enforcing business rules in the database application code. • by applying column or object level integrity constraints. - ORACLELAND
- 8. Q4. WHAT IS DATA CONSISTENCY AND HOW IT IS MAINTAINED IN ORACLE? PROBABILITY: Low TYPE: Conceptual EXPERIENCE: Any COMPLEXITY: Low TOPIC: DBMS Explanation: Data Consistency: • an assurance that each user sees a consistent view of the data, including visible changes made by the user's own transactions and committed transactions of other users. It can be maintained in Oracle by: • using a multi version consistency model. • using various types of locks and transactions. - ORACLELAND
- 9. Q5.WHAT ARE THE TYPES OF CONSTRAINTS IN DBMS? PROBABILITY: Medium TYPE: Conceptual EXPERIENCE: Any COMPLEXITY: Low TOPIC: DBMS Explanation: There are four types of constraints: 1. Not Null Constraint. 2. Unique Key Constraint. 3. Primary Key Constraint. 4. Foreign Key Constraint. - ORACLELAND
- 10. Q6. WHAT IS DEFERRED CONSTRAINT? PROBABILITY: Low TYPE: Conceptual EXPERIENCE: Any COMPLEXITY: Low TOPIC: DBMS Explanation: • a deferred constraint is enforced when a transaction is committed. • DEFERRABLE clause is used to create such constraint. • once created, a constraint cannot be changed to DEFERRABLE. • ... INITIALLY DEFERRED specifies that the constraint is only checked when a transaction is committed. - ORACLELAND
- 11. Q7.WHAT IS SQL? PROBABILITY: Medium TYPE: Conceptual EXPERIENCE: 0-4 COMPLEXITY: Low TOPIC: SQL Explanation: • SQL stands for Structured Query Language. • used to communicate with a database. • the standard language for relational database management systems. • used to perform tasks such as update data on a database, or retrieve data from a database. - ORACLELAND
- 12. Q8. WHAT ARE DIFFERENT TYPES OF SQL STATEMENTS? PROBABILITY: Medium TYPE: Conceptual EXPERIENCE: Any COMPLEXITY: Low TOPIC: SQL Explanation: There are six types of sql statements: 1. Data Definition Language (DDL) Statements: - CREATE .../ ALTER .../ DROP .../RENAME / TRUNCATE/ COMMENT 2. Data Manipulation Language (DML) Statements: - DELETE / EXPLAIN PLAN / INSERT / LOCK TABLE/ MERGE / SELECT / UPDATE 3. Transaction Control (TCL) Statements: - COMMIT/ ROLLBACK/ SAVEPOINT / SET TRANSACTION 4. Session Control Statements: - ALTER SESSION .../SET ROLE ... 5. System Control Statement: - ALTER SYSTEM... 6. Embedded SQL Statements: - these statements place DDL, DML, and transaction control statements within a pl/sql program. - ORACLELAND
- 13. Q9.WHAT IS PL/SQL? PROBABILITY: Medium TYPE: Conceptual EXPERIENCE: Any COMPLEXITY: Low TOPIC: PLSQL Explanation: • PL/SQL stands for “ Procedural Language extensions to SQL“. • introduced to overcome some limitations in SQL and to provide a more complete programming solutions. • highly structured, readable and accessible language. • standard and portable language for Oracle development. • high-performance, highly integrated database language. - ORACLELAND
- 14. Q10. WHAT IS THE DIFFERENCE BETWEEN SQL AND PL/SQL? SQL • is a Structural Query Language • is a declarative language. • has no variables. • can execute a single operation at a time. • can be embedded in a PL/SQL block. • is used to write queries, create and execute DDL and DML statements. PL/SQL • is a programming language using SQL • is a procedural language. • has variables, data types etc. • can perform multiple operation at a time. • can also be embedded in SQL code. • is used to write program blocks, functions, procedures, triggers and packages. PROBABILITY: High TYPE: Conceptual EXPERIENCE: 0-5 COMPLEXITY: Low TOPIC: PLSQL - ORACLELAND Explanation:
- 15. THATS ALL FOR PART 1 ON INTERVIEW QUESTIONS SERIES. NEXT VIDEO OF THIS SERIES: ORACLE DATABASE INTERVIEW QUESTIONS - PART 2 - Link available in description section of this video. FOR COMPLETE TRAINING VIDEOS, CHECKOUT THE PLAYLIST: ORACLE PLSQL CHAPTERS - Link available in description section of this video.
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