HCL Infosystems Oracle Database Administrator Interview Questions and Answers

Upgrading to Oracle Database 19c and related challenges

• Ensure compatibility of existing applications with 19c

• Perform pre-upgrade tasks such as backup and patching

• Upgrade the database using DBUA or manual methods

• Address challenges such as deprecated features and changes in behavior

• Configure Data Guard for high availability and disaster recovery

• Rollback an OPatch using the -rollback option

• Use RMAN duplication to create a

A lean supply chain focuses on minimizing waste and maximizing efficiency in the flow of goods and services.

• Focuses on reducing waste in all aspects of the supply chain

• Emphasizes efficiency in production, transportation, and distribution

• Involves continuous improvement and optimization of processes

• Utilizes tools like Just-In-Time inventory management and Kanban systems

• Examples include Toyota's production system and Dell

Kaizen is a Japanese business philosophy of continuous improvement, while Kanban is a scheduling system for lean manufacturing.

• Kaizen focuses on making small, incremental improvements in processes and systems.

• Kaizen involves all employees in the organization and encourages suggestions for improvement.

• Kanban is a visual scheduling system that helps manage workflow by limiting work in progress.

• Kanban uses cards or signal...read more

Oracle is a relational database management system developed by Oracle Corporation.

• Oracle is used to store and manage data in a structured manner.

• It supports SQL and PL/SQL programming languages.

• Indexes are updated by the database itself as part of its maintenance tasks.

• However, DBAs can also manually update indexes if needed.

To take RMAN backup quickly, use parallelism, compression, and backup sets.

• Use multiple channels to take backup in parallel

• Enable compression to reduce backup size

• Use backup sets to split backup into smaller pieces

• Use incremental backup to reduce backup time

• Use fast recovery area to store backups for quick recovery

To check long running in database, use SQL queries to identify and troubleshoot slow queries.

• Use Oracle Enterprise Manager to monitor database performance

• Check the V$SESSION_LONGOPS view to identify long running operations

• Use SQL trace to identify slow queries

• Check the alert log for any errors or warnings

• Use AWR reports to analyze database performance over time