Microsoft SQL Server interview questions for DBA


These services typically are started when the operating system starts. This depends on what is specified during setup; some services are not started by default. A service is a type of application that runs in the system background.

How do I prepare for SQL Server DBA interview?

  1. What types of replication does an SQL server support?
  2. How do you troubleshoot a performance issue on your SQL Server?
  3. What is blocking and what is the best way to deal with it?
  4. What is DBCC?
  5. What kind of recovery models can you use in SQL server?

Write-intensive operations-The RDBMS is frequently written to and is often used in transaction-oriented applications. Here is an example of a SQL query and the result in an Oracle database. If you have questions about the above, ask a qualified human resources professional. Remember that if the candidate seems like someone you want to have a beer with, that has nothing to do with the job.

What authentication modes does SQL Server support?

I agree and endorse his view, as SQL Server, or for that matter any other database, is very much an I/O intensive system. RAID is not a part of a database like SQL Server, implementing RAID can directly affect the way SQL Server performs. There are many RAID arrays available such as RAID 0, RAID 1, RAID 3, RAID 4, RAID 5, RAID 6, RAID 10 and RAID 01. Trace flags are used to temporarily set specific server characteristics or to switch off a particular behavior. For example, if trace flag 3205 is set when an instance of SQL Server starts, hardware compression for tape drivers is disabled.

I’d ask this question if it wasn’t discussed in the previous question. Columnstore indexes are highly compressed data for heavy reporting workloads, and for queries that would otherwise be scanning millions of rows of data. Columnstore indexes can be the clustered index, or a “nonclustered” index. In SQL Server 2022, ordered clustered columnstore indexes can benefit from partition elimination to greatly improve performance.

You have created a database snapshot on the primary replica. What would happen to the database snapshot if the

It can be achieved by making a group of data in the redundant form. The un-normalized and de-Normalized database are completely different from each other. Before the process of de-normalization of any database, that should be normalized firstly. Brent recorded videos helping you prepare and practice for interviews with 100 practice DBA interview questions on on your desktop, laptop, iPad, or iPhone.

Joins are used to get data from two or more tables based on the relationships among some of the columns in the tables. Normalization is the process of organizing data into a related table. It also eliminates redundancy and increases integrity which improves the performance of the query. To normalize a database, we divide the database into tables and establish relationships between the tables. To define the relationship between two tables connected by columns, a foreign key constraint is used.

Do you know about the Resource Database?

DML triggers evaluate data before it has been committed to the database. A function is a sequence of statements that accepts input, processes them to perform a specific task, and provides the output. Functions must have a name, but the function how to become a sql server dba name can never start with a special character such as @, $, #, and so on. The right outer join displays all the rows from the second table and matching rows from the first table. A Full Outer Join fetches all records of both tables.

  • Generally, when data is less, people do not care about database design.
  • You can choose an authentication mode by changing Server Authentication on Security page in Properties of SQL Server Management Studio.
  • Use pre-employment tests as soon as you start receiving applications for database administrators with SQL Server experience.
  • This includes graphical tools and wizards for building and debugging packages.
  • If applicable, ask this question and look for particular experience with large databases.

If we are using a Not Null Constraint for a column, we cannot ignore this column’s value during the data insertion into the table. Copy and paste the code into the new Query Editor window, then execute it. Or, you can create a database using the SQL Server Management Studio. Then, Right-click on Databases, select New Database and follow the wizard steps. You can create a new database using the CREATE DATABASE SQL command.


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