Scenario: A critical table in the database was accidentally deleted. What recovery strategy can the DBA employ to restore the table and minimize data loss?
- Manually recreate the table structure and insert data from application logs.
- Perform a table-level restore from the last backup and apply transaction logs to recover data up to the point of deletion.
- Roll back the entire database to the state before the deletion occurred.
- Use DB2's flashback feature to recover the table to its state before deletion.
To restore a critical table accidentally deleted in DB2, the DBA can perform a table-level restore from the last backup and apply transaction logs to recover data up to the point of deletion. This strategy helps minimize data loss by selectively restoring only the affected table without affecting the rest of the database.
In high availability setups, the primary goal is to minimize ________ in case of a system failure.
- Data corruption
- Downtime
- Network latency
- Performance degradation
High availability setups aim to minimize downtime in case of system failure. Downtime refers to the period when a system is unavailable or inaccessible, which can result in significant losses for businesses.
Log shipping in disaster recovery involves periodically copying ________ from the primary to the standby server.
- Data files
- Entire database
- Log files
- Transaction logs
Log shipping in disaster recovery typically involves copying transaction logs from the primary database server to the standby server. These transaction logs contain a record of all changes made to the database, allowing the standby server to maintain a synchronized copy of the primary database for disaster recovery purposes.
In DB2, user-defined functions are typically stored in ________.
- Indexes
- Packages
- Schemas
- Tables
In DB2, user-defined functions are typically stored in Packages. Packages provide a way to group related functions and procedures together, making it easier to manage and deploy them within the database.
The ROLLFORWARD command in DB2 is used to ________.
- Recover the database
- Rollback transactions
- Apply database changes
- Restore the database
The correct option is Option 3: Apply database changes. The ROLLFORWARD command in DB2 is used to apply database changes that were recorded in the transaction log files since the last backup was taken. It's essential for maintaining database integrity and consistency during recovery processes.
The INSERT INTO statement in SQL is used to ________ new records into a database table.
- Add
- Append
- Create
- Insert
The INSERT INTO statement in SQL is used to add new records or rows into a table. It allows you to specify the values for each field or column you want to insert into the table.
Which normal form allows multivalued attributes?
- First Normal Form (1NF)
- Fourth Normal Form (4NF)
- Second Normal Form (2NF)
- Third Normal Form (3NF)
Third Normal Form (3NF)
What is the significance of the Communication Manager in DB2's architecture?
- Ensuring data integrity during transactions
- Handling communication between clients and DB2 database instances
- Managing database backups and recovery operations
- Optimizing SQL queries for better performance
The Communication Manager in DB2's architecture plays a crucial role in handling communication between clients and DB2 database instances, ensuring smooth interaction and efficient data transfer.
In what scenarios would denormalization be recommended in a database design?
- Enhance data integrity
- Improve query performance
- Increase data consistency
- Reduce redundancy
Denormalization is recommended in scenarios where there is a need to improve query performance by reducing the number of joins required to retrieve data, even at the cost of redundancy and potentially sacrificing some data integrity and consistency.
The output of a user-defined function in DB2 can be used as a ________ in SQL statements.
- Column
- Parameter
- Subquery
- Variable
The output of a user-defined function in DB2 can be used as a column in SQL statements. This means that the result returned by the function can be treated as a regular column value and utilized in various SQL operations, including SELECT, INSERT, UPDATE, and DELETE statements. Utilizing user-defined functions in this manner enhances the flexibility and power of SQL queries, allowing developers to leverage custom logic within their database operations.