51 SQL Server DBA interview questions TG

Placing the subsets of data in separate tables and Creation of relationships between the tables using primary keys. Full join return rows when there are matching rows in any one of the tables. This means, it returns all the rows from the left hand side table and all the rows from the right hand side table. A table is a set of data that are organized in a model with Columns and Rows. Columns can be categorized as vertical, and Rows are horizontal.

Scalar functions return a single value based on the input value. SQL clause is defined to limit the result set by providing condition to the query. This usually filters some rows from the whole set of records. A nonclustered index does not alter the way it was stored but creates a complete separate object within the table. Stored Procedure is a function consists of many SQL statement to access the database system. Several SQL statements are consolidated into a stored procedure and execute them whenever and wherever required.

Q. Explain Replication in SQL Server.

On a more positive note, you’re guaranteed to get the latest data. Bidirectional transactional replication replicates data between two servers, with both servers publishing and https://remotemode.net/ subscribing to the data from the other server. Snapshot replication snapshots the main database copy at a certain point in time and replicates its data to another database.

It also reduces network traffic and provides better security to the data. For example – UCASE(), NOW() are calculated with respect to string. It is usually used in a GROUP BY clause and whenever GROUP BY is not used, HAVING behaves like a WHERE clause. Having Clause is only used with the how to become a sql server dba GROUP BY function in a query whereas WHERE Clause is applied to each row before they are a part of the GROUP BY function in a query. This statement allows conditional update or insertion of data into a table. It performs an UPDATE if a row exists, or an INSERT if the row does not exist.

What are some performance tuning tips for SQL Server?

Simply, it returns all the rows from Left hand side table even though there are no matches in the Right hand side table. Right join return rows which are common between the tables and all rows of Right hand side table. Simply, it returns all the rows from the right hand side table even though there are no matches in the left hand side table.

And if you want to get ready for the job interview, test your knowledge of these 10 SQL window function interview questions. The interviewer is likely asking this question to gauge the level of experience the SQL DBA has with backup and restore strategies. This is important because it can indicate how well the DBA can plan for and recover from data loss. During your hiring process, look for candidates with experience in database administration who are familiar with data privacy and recovery procedures. An academic background in Computer Science and knowledge of statistical analysis packages are pluses.

How to Nail your next Technical Interview

To get a sense of the SQL DBA’s problem-solving skills and ability to troubleshoot issues. To see if the SQL DBA is familiar with common mistakes made by others in their role, and whether they are able to avoid making those same mistakes. Keeping the database up to date with the latest patches and service packs. Ensuring that the right indexes are in place for the queries that are being run. Let’s summarize some of the questions and add a few more divided into specific types.

• If a candidate can show you this, it means s/he is very likely to be experienced
  in performance tuning.
• Collation is defined as a set of rules that determine how data can be sorted as well as compared.
• It is often considered as one of the High-Availability options.
• Left join return rows which are common between the tables and all rows of Left hand side table.
• Skilled database administrators should know that DBCC is an acronym for database consistency checker.

Knowledgeable interviewees should know that PL/SQL means procedural and structured query language. They should know that administrators use this query language with Oracle and that it integrates seamlessly with SQL. Candidates should be able to give examples related to their Microsoft SQL Server proficiency. They may describe a project they have worked on using Microsoft SQL Server or a complex challenge they have solved using this relational database management system. Skilled applicants will know that technical experts introduced transparent data encryption in 2008 to protect the files of the SQL Server database and prevent unauthorized access.

Q74. What do you mean by “Trigger” in SQL?

Interviewers often like to ask you some general questions about SQL Server as a warm-up. To understand how the DBA would approach designing and implementing a disaster recovery solution for SQL Server. To determine whether the DBA is familiar with the specific disaster recovery solution that the company uses. To get a sense of the candidate’s self-awareness and ability to learn from mistakes.

• In this article, we review examples of various sql server dba interview questions and sample answers to some of the most common questions.
• It was created to aid developers in the development of enterprise-level applications by ensuring data integrity and fault tolerance in systems.
• Check the answers to these five frequently asked SQL server DBA interview questions to evaluate your candidates’ responses and knowledge.
• BLOB may be used to store binary data, which includes images, movies, audio, and applications.
• Table variables are used in functions, stored procedures, and batches.
• Interviewees who understand SQL databases will know that SQL agents enable administrators to execute administrative tasks or jobs according to a schedule in the SQL server.

There are a few reasons why an interviewer might ask this question. First, they may be trying to gauge your level of experience with the platform. If you can identify common problems and offer solutions, it will show that you are knowledgeable and have experience dealing with these issues.