When answering this question, focus on the tools, techniques, and best practices you use to monitor and maintain database health. Mention specific monitoring tools (e.g., Nagios, New Relic, or built-in database monitoring tools), and describe how you use them to track performance metrics such as CPU usage, memory usage, disk I/O, and query performance. Discuss regular maintenance tasks like backups, indexing, and updates. Provide examples of how you've identified and resolved issues in the past, and emphasize your proactive approach to preventing problems before they occur. For example:
"I use a combination of Nagios and the database's built-in monitoring tools to keep an eye on performance metrics like CPU usage, memory usage, and query performance. I also set up alerts for any unusual activity. Regular maintenance tasks include performing backups, updating indexes, and applying patches. For instance, in my previous role, I noticed a sudden spike in query response times, which I traced back to a missing index. By adding the index, I was able to bring the response times back to normal levels. I believe in a proactive approach, so I regularly review performance reports and conduct audits to ensure everything is running smoothly."
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