Sql Server Database Interview Questions And Answers For Experienced – In this article, we will discuss the SQL interview questions and answers that can be asked in the second round of technical stages. These interview questions are based on real life experiences. Hence, it can be a very useful resource when you are preparing for your second round of SQL technical interviews.
Many companies conduct technical interviews to assess candidates’ knowledge. Often this hiring process does not involve completing a single technical interview. The first interview focuses mainly on your skills and tries to find out if you meet the basic qualifications required for the job. After being invited for second round of technical interviews, your questions will be very difficult compared to the previous ones. Therefore, it is best to prepare in-depth questions for this stage. In this article, you will find some possible SQL interview questions for second stage and detailed answers.
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When executing transactions with SQL Server, the lock manager must lock database objects to ensure database consistency. However, each locked object held by the lock manager consumes 96 bytes of memory. When working with a large number of rows, it may require a large amount of memory to lock the rows. To minimize this memory consumption, SQL Server uses a mechanism called scaling locking. When a row or page lock exceeds the limit, the lock escalation mechanism converts the row or page lock into a table lock, thereby reducing the amount of memory usage.
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Now we will create a table and insert 10k rows into this table to illustrate the lock escalation mechanism in SQL Server.
The lock manager places an intent exclusive (IX) lock on data pages and tables containing rows when the modified row acquires an exclusive lock. The lock hierarchy in SQL Server starts at the database level and goes down to the row level.
As we can see in the example, the database has acquired a shared key (S) and the type of this key indicates that someone is using this database. The table (object) and page have acquired a shared intent (IS) lock because the modified row (lock) acquired an exclusive (X) lock.
Consequently, when we increase the number of rows to be modified, the lock escalation mechanism will be activated and the table will acquire an exclusive lock. This mechanism will remove locked rows and increase memory consumption.
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The key scaling threshold is at least 5,000 keys, but this number can change based on various factors and is not an exact number. The lock manager considers several parameters such as the number of rows, the size of the rows, and the structure of the table to determine this number.
2. Why do we use table hints in SQL Server and can you give an example?
This SQL interview question can be asked to test your knowledge of query pointers. The suggestions in the table are used to change the default behavior of the default job parameters so that we can handle different problems. For example, the TABLOCKX hint places an exclusive lock on the specified table until the transaction completes. As we see in the example below, row-level exclusive locks are the default behavior, but we’ll change this type of table-level locking with the TABLOCKX directive.
SQL Query Optimizer wants nothing to do with creating optimized query plans for simple queries to avoid consuming time and resources. For example, the query optimizer would generate a trivial execution plan for the following query.
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We can see the type of execution plan created in the Statement optimization level property of the Select operator.
When we disabled the creation of the trivial execution plan, the query optimizer had created a FULL optimized query plan and decided that this query needed indexes to be faster.
This SQL interview question can be asked to test your knowledge about upgrading to a new version of SQL Server.
This feature was introduced with the SQL Server 2019 release and helps to access hundreds of rows in a retrieval instead of row-by-row mode and is specially designed for aggregation and sorting operations. Now, let’s look at the actual execution plan for the following query.
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As we can see in the operator properties select Batch mode in the used store row properties is correct. This indicates that some of the execution plan operators have performed batch mode execution on the row store. Now, we’ll open the clustered index scan operator properties.
When XACT_ABORT is enabled, if any SQL statement has an error in a transaction, the entire transaction is terminated and aborted. If we disable XACT_ABORT, when the statement returns an error, only the query in error is aborted and the other query completes the operation.
In the following query, we will enable XACT_ABORT and then try to insert duplicate rows, so the entire transaction will be rolled back.
We’ll disable XACT_ABORT in the following query, so that all insert statements execute successfully except for the one that generated the error.
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In this article, we cover some SQL interview questions that can be asked in the second round. This second round of interview questions will be more complicated and difficult. This round will be more difficult as it will include more technical questions than traditional interview questions.
Esat Erkec is a SQL Server professional who started his career more than 8 years ago as a software developer. He is a Microsoft SQL Server Certified Solutions Specialist.
Most of his career has focused on SQL Server database administration and development. His current interest is database administration and Business Intelligence. You can find them on LinkedIn.
© 2023 Quest Software Inc. ALL RIGHTS RESERVED. | GDPR | Terms of use | Privacy When hiring DBAs with SQL Server experience, you likely have two primary goals: first, to find the right expert with the best SQL Server DBA experience for your organization, and second, to hire quickly to reduce recruitment costs. So what’s the best way to achieve both?
Sql Interview Questions. Hope Someone Finds This Helpful. Link To Full Pdf Is In The Comments Section
You don’t need a complicated and lengthy hiring process if you have the right tools: a skills assessment and the right interview questions.
First, assess applicants’ skills with online skills tests, including the SQL Server test. Then interview your top candidates to see who really has the right skills and attitude to succeed in the role.
But what if you’re not sure what questions to ask during an interview? We’ve got you covered! In this article, you’ll find 51 SQL Server DBA interview questions to review and hire top talent.
Ask your applicant some of these 10 frequently asked SQL Server interview questions to test their general knowledge of SQL Server and database administration.
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Check out the answers to these five frequently asked SQL Server DBA interview questions to evaluate your candidate’s answers and knowledge.
Troubleshooting skills are critical for SQL Server DBAs for several reasons: they help them identify problems, fix them quickly, and apply the right solutions consistently.
If your applicant has the right problem-solving skills, they will not only adhere to predefined procedures, but will be able to use their technical and problem-solving skills to deal with problems effectively.
If you need a more detailed assessment of your applicant’s ability to solve problems, you can use our Problem Solving Test before hiring.
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SQL Server DBAs must work with and communicate frequently with other team members (such as users and developers).
Communication is about using the appropriate communication method for each group, which is why communication skills are so important for a SQL Server DBA.
Qualified applicants will note that transparent data encryption was introduced by technical experts in 2008 to protect SQL Server database files and prevent unauthorized access.
Can your requester explain that DBCC refers to database console command statements? Can you list the four examples of DBCC?
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Key examples you should look at include maintenance, assortment, validation, and informational DBCC statements. The main answers will also explain what each of these statements and commands allow database administrators to do.
Interviewees with a strong knowledge of SQL Server will note that the recovery model controls the transaction recording process. They allow database administrators to complete backups and view available restore operations.
Check out sample answers to the five most important SQL DBA interview questions for juniors. Use them as a guide when evaluating your potential database administrator’s next response.
In contrast, Windows authentication is the default authentication mode that grants access to the user if the system has verified the user.
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The candidate should know that the checkpoint truncates the transaction log to the beginning of the oldest open transaction and the system writes the cache pages to disk. They could also explain that by storing the transactions that the engineers made, the cache increases the performance of SQL Server.
Applicants with the best SQL Server DBA knowledge will be able to explain that there are four high availability solutions in SQL Server, including replication, log shipping, database mirroring, and clustering. errors. Can your interviewee detail each of these solutions and explain what they do?
Ask your candidate some of these 10 SQL Server DBA Situational Interview Questions to learn how
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