Try These Oracle 1Z0-076Dumps for Guaranteed Success and High Scores
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Questions and Answers

What is a primary consideration when tuning database performance?

  • Implementing additional software resources.
  • Understanding the workload on the database system. (correct)
  • Regularly updating the operating system.
  • Increasing disk space capacity dramatically.

    • What tool can be used to monitor system performance and identify bottlenecks in a database?

  • Task Manager
  • Network performance analyzer
  • Database monitoring tools (correct)
  • Disk cleanup utility

    • Which of the following factors should be adjusted to maintain optimal database performance?

  • Operating system user permissions.
  • Developer training sessions.
  • Buffer cache size. (correct)
  • Software update frequency.

    • Which aspect of query optimization is critical to ensure efficient database performance?

    <p>Use of the execution plan.</p> Signup and view all the answers

    What impact does lock contention have on database performance?

    <p>It can significantly degrade performance by blocking access to resources.</p> Signup and view all the answers

    What type of backup only copies changes made since the last full or incremental backup?

    <p>Incremental backup</p> Signup and view all the answers

    Which of the following best describes recovery time objective (RTO)?

    <p>The maximum acceptable amount of time to restore data after a failure</p> Signup and view all the answers

    Which SQL query optimization technique can significantly improve performance by organizing data access?

    <p>Implementing proper indexing</p> Signup and view all the answers

    What is the primary function of data masking in a database?

    <p>To obscure sensitive information while maintaining usability</p> Signup and view all the answers

    Which principle emphasizes providing users with the minimum level of access necessary to perform their functions?

    <p>Least privilege principle</p> Signup and view all the answers

    What role does RMAN (Recovery Manager) play in database management?

    <p>It manages backups and restores of databases</p> Signup and view all the answers

    Which of the following is NOT a benefit of employing regular recovery procedure tests?

    <p>Increasing overall system downtime</p> Signup and view all the answers

    What is the impact of using appropriate join types in SQL queries?

    <p>They can improve performance by correctly linking tables</p> Signup and view all the answers

    Study Notes

    Backup and Recovery

    • Understanding different backup types (full, incremental, differential) is crucial for disaster recovery planning.
    • Full backups copy the entire database, while incremental backups only copy changes since the last full or incremental backup.
    • Differential backups copy changes since the last full backup.
    • RMAN (Recovery Manager) is a powerful tool for managing backups and restores.
    • Efficient backup strategies minimize downtime and ensure data integrity.
    • Recovery procedures should be tested regularly to ensure success in case of a failure.
    • Database restore procedures are necessary for recovering data after a failure.
    • Effective backup design includes choosing the right backup type, frequency, and retention policy.
    • Understanding recovery time objectives (RTO) and recovery point objectives (RPO) helps design an effective backup strategy.

    SQL Query Optimization

    • Understanding query execution plans is essential for optimizing queries.
    • Indexing can significantly speed up query performance. Choosing appropriate indexes is critical.
    • Using appropriate join types (e.g., inner, outer) ensures optimal join performance.
    • Avoiding correlated subqueries or using appropriate techniques for reducing their impact.
    • Using appropriate data types for columns to prevent implicit conversions during query execution.
    • Writing efficient SQL queries, including correct use of WHERE, JOIN, GROUP BY, ORDER BY clauses.
    • Employing the use of hints to influence query plan for maximum performance.
    • Using appropriate techniques for filtering large datasets (e.g. IN, EXISTS, NOT IN).
    • Analyzing query performance using monitoring tools and SQL trace facilities to identify performance bottlenecks.

    Data Security

    • Data encryption plays a key role in safeguarding sensitive information.
    • Access control mechanisms, such as roles, privileges, and users, should be implemented.
    • Applying proper security measures to protect data at rest and in transit.
    • Implementing audit trails to track database activity is essential for security monitoring.
    • Data masking and pseudonymisation techniques can protect sensitive data while still allowing analysis.
    • Understanding the importance of least privilege principle in granting access.
    • Robust password policies and regular password changes are important to secure accounts.
    • Monitoring for security threats and responding promptly is crucial.
    • Securing the database server's physical location is important.
    • Implementing Intrusion Detection and Prevention Systems (IDPSs) is critical.

    Performance Tuning

    • Database performance tuning involves identifying and addressing bottlenecks.
    • Using appropriate hardware resources for the database such as RAM, CPU capacity.
    • Tuning buffer cache size for optimal performance.
    • Monitoring system performance with database monitoring tools.
    • Monitoring wait events for insight into bottlenecks during queries.
    • Understanding the performance considerations involving the optimizer and query plan. Use of the execution plan is critical.
    • Correct indexing, statistics collection, and maintaining statistics in the database schema are important to ensure optimal performance.
    • Performance tuning requires understanding the workload on the database system.
    • Adjusting parameters according to workload changes to maintain performance.
    • Employ tools to monitor for lock contention which impacts performance.
    • Understanding and tuning the database configuration parameters for best performance.

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    Description

    This quiz focuses on the crucial concepts of backup and recovery strategies in database management. You'll explore different backup types, the role of RMAN, and the importance of recovery objectives. Test your knowledge on designing efficient backup strategies and recovery procedures.

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