Ms Sql Dba Interview Questions

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Ms Sql Dba Interview Questions

Top MS SQL DBA Interview Questions

Ms Sql Dba Interview Questions

During an MS SQL DBA interview, you can expect questions related to your experience with database administration tasks such as database backup and recovery, performance tuning, security, high availability, and disaster recovery. Employers may also ask about your knowledge of SQL Server architecture, T-SQL programming, and experience with tools like SSMS and SQL Profiler. Additionally, you may be asked about your approach to troubleshooting common database issues and your familiarity with monitoring and maintenance tasks to ensure the optimal performance of SQL Server databases. It is advisable to come prepared to discuss your hands-on experience with SQL Server and provide examples of successful projects you have worked on in the past.

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1 - What is a clustered index in SQL Server?

In SQL Server, a clustered index determines the physical order of the data within the table. When a clustered index is created on a table, the data rows are stored in the leaf nodes of the index in the order specified by the index key. This means the rows in the table are physically stored in the same order as the clustered index key.

2) What is the difference between CHAR and VARCHAR data types?

CHAR is a fixed length data type that stores data with a fixed length of up to 8,000 bytes. VARCHAR is a variable length data type that stores data with a maximum length of up to 8,000 bytes. CHAR is padded with spaces at the end to reach the defined length, while VARCHAR only uses the necessary storage for the actual data.

3) How can you improve the performance of a query in SQL Server?

To improve query performance in SQL Server, you can consider strategies such as creating appropriate indexes, optimizing query execution plans, rewriting complex queries, updating statistics, and using tools like the Database Engine Tuning Advisor to identify performance bottlenecks and suggest improvements.

4) What are the different types of backups available in SQL Server?

SQL Server provides various types of backups, including Full Backup, Differential Backup, Transaction Log Backup, and Copy only Backup. Full Backup creates a complete backup of the database, while Differential Backup captures only the changes made since the last full backup. Transaction Log Backup captures all transactions since the last log backup, ensuring point in time recovery.

5) How can you monitor the performance of SQL Server?

To monitor the performance of SQL Server, you can use tools like SQL Server Profiler, Dynamic Management Views (DMVs), Performance Monitor, and Extended Events. These tools help track and analyze query performance, resource usage, server activity, and identify potential bottlenecks or issues affecting the server's performance. Regular monitoring and analysis are crucial for maintaining optimal SQL Server performance.

 

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