1Z0-1123-25

The Oracle 1Z0-1123-25 exam, titled "Oracle Database Administration II," focuses on administering a production Oracle Database environment. The main points covered are broadly categorized, but the specifics within each category can vary slightly depending on the exam's version and Oracle's updates. However, the core areas always remain relatively consistent:

I. Database Backup and Recovery:

• Different backup types: Full, incremental, cumulative, etc., and their implications (recovery time, storage space, etc.).
• Recovery scenarios: Point-in-time recovery, flashback database, recovering from various failures (media, instance, etc.).
• RMAN (Recovery Manager): Using RMAN for backups, restorations, and recovery operations. This is a heavily tested area.
• Data Guard: Understanding and configuring Data Guard for high availability and disaster recovery.
• Backup and recovery strategies: Planning for different recovery time objectives (RTO) and recovery point objectives (RPO).

II. Performance Tuning and Monitoring:

• SQL tuning: Identifying and resolving performance bottlenecks in SQL statements. Includes understanding execution plans.
• Database performance monitoring: Using tools (e.g., AWR, ADDM) to analyze database performance and identify areas for improvement.
• Resource management: Managing memory, CPU, I/O resources within the database.
• Index management: Creating, maintaining, and troubleshooting indexes.
• Statistics management: Gathering and analyzing database statistics.

III. Security:

• Security features: Understanding and implementing Oracle's security features (e.g., roles, privileges, auditing).
• Database user management: Creating, managing, and securing database users and their access.
• Security hardening: Implementing best practices to protect the database from threats.
• Network security: Securing the database network and connections.
• Data encryption: Understanding and implementing data encryption techniques.

IV. Administration and Operations:

• Space management: Managing tablespaces, data files, and temporary files.
• Database administration tasks: Starting, stopping, and managing the database instance.
• Troubleshooting: Identifying and resolving common database problems.
• Patching and upgrading: Applying patches and upgrading the database.
• Storage management: Understanding and managing different storage options (e.g., ASM, file system).

V. High Availability and Disaster Recovery (HADR): (Often intertwined with Backup and Recovery)

• This is a critical area focusing on maintaining database availability and recovering from outages. It covers topics like:
  • Oracle RAC (Real Application Clusters)
  • Data Guard (already mentioned, but its significance in HADR is paramount)
  • Failover mechanisms
  • High availability architectures

It's crucial to remember that this is a broad overview. The exam will delve into the specifics within each area, requiring a deep understanding of the concepts and practical application. Any official Oracle documentation and practice exams provided by Oracle will provide the most up-to-date and precise details on the exam's content.