Being a Teradata Database Administrator (DBA) involves various activities related to managing and maintaining the Teradata system. Here's a list of common Teradata DBA activities along with brief answers:
1. What is Teradata and its Architecture?
- Answer: Teradata is a relational database management system (RDBMS) designed for data warehousing. Its architecture follows a shared-nothing, parallel processing model with nodes that independently manage and process data.
2. How do you monitor Teradata system performance?
- Answer: Teradata performance can be monitored using tools like Teradata Viewpoint, which provides real-time monitoring, alerting, and performance analysis.
3. Explain the process of backup and recovery in Teradata.
- Answer: Teradata uses the ARC utility for backup and recovery. ARC performs archive and restore operations, allowing DBAs to create and restore database copies.
4. What is the role of the Teradata Data Dictionary?
- Answer: The Teradata Data Dictionary contains metadata about the database, including tables, views, indexes, users, privileges, and more. It's a crucial resource for administrators to understand the database structure.
5. **How do you manage user access and privileges in Teradata?**
- **Answer:** Teradata administrators use GRANT and REVOKE statements to manage user access and privileges. Access rights can be granted on databases, tables, views, and stored procedures.
6. **Explain the process of collecting statistics in Teradata.**
- **Answer:** Collecting statistics in Teradata involves using the COLLECT STATISTICS statement. Statistics help the optimizer make better decisions about query execution plans.
7. **How do you handle space management in Teradata?**
- **Answer:** Teradata uses space management features like cylinders and blocks. DBAs monitor space usage, and if needed, they can perform space rebalancing or add additional storage.
8. **What is MultiLoad in Teradata, and how is it used?**
- **Answer:** MultiLoad is a Teradata utility for high-volume, batch maintenance operations. It is used for loading, updating, and deleting large volumes of data from tables.
9. **Explain the importance of Teradata Indexes.**
- **Answer:** Indexes in Teradata improve query performance by allowing faster data retrieval. They are critical for optimizing queries on large tables.
10. **How do you handle Teradata system upgrades?**
- **Answer:** Teradata system upgrades involve planning, testing, and executing the upgrade process. DBAs ensure data integrity, compatibility, and performance after the upgrade.
11. **What is Teradata Viewpoint, and how is it beneficial?**
- **Answer:** Teradata Viewpoint is a web-based management and monitoring tool. It provides a centralized interface for administrators to monitor system health, performance, and manage resources.
12. **How do you troubleshoot performance issues in Teradata?**
- **Answer:** Performance troubleshooting in Teradata involves analyzing query plans, collecting performance statistics, and using tools like Teradata Query Scheduler to identify and address bottlenecks.
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