Can you explain the difference between a tablespace and a datafile in Oracle databases? How do you perform a backup and recovery in Oracle Database? What are the various types of backups? What is Oracle RAC, and how does it differ from a single-instance Oracle database? Describe the Oracle listener and its significance in the database architecture. What is the purpose of the Oracle Data Dictionary, and how do you access it? How do you identify and resolve performance bottlenecks in an Oracle database? Explain the concept of table partitioning in Oracle. When and why would you use it? Can you discuss the differences between a hot backup and a cold backup in Oracle databases? What are the steps involved in creating a new user in an Oracle database and granting them the necessary privileges? Describe the importance of the Oracle Automatic Storage Management (ASM) feature. How do you handle database security in Oracle, including user authentication and authorization? What is the purpose of the Oracle Enterprise Manager (OEM) and how do you use it for database management? Can you explain the concept of PL/SQL and how it is used in Oracle databases? What is the Oracle Grid Control and how does it differ from other database management tools? How do you troubleshoot and resolve common database errors and issues in Oracle?

It was mixed from AWR report, RAC and performance based. Wait Events. Execution plan.