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SQL Server DBA Interview Questions. 1. What are the steps used to improve the performance of a poor query? Maximum use of indexes, stored procedures. 19 SQL Server DBA Interview Questions and Answers Top 50 SQL Interview Questions and Answers Pdf SQL Server Interview Questions. junior-sql-server-dba-interview-questions - Download as PDF File .pdf), Text File .txt) or read online.
What are statistics, under what circumstances they go out of date, how do you update them? A Statistics determine the selectivity of the indexes. If an indexed column has unique values then the selectivity of that index is more, as opposed to an index with non-unique values.
Query optimizer uses these indexes in determining whether to choose an index or not while executing a query. Some situations under which you should update statistics: If there is significant change in the key values in the index If a large amount of data in an indexed column has been added, changed, or removed that is, if the distribution of key values has changed , or the table has been truncated using the TRUNCATE TABLE statement and then repopulated Database is upgraded from a previous version Q Could you please some items which you may see in an execution plan indicating the query is not optimized.
Top 50 Sql Server Dba Interview Questions And Answers Pdf
An Active — Passive cluster is a failover cluster configured in a way that only one cluster node is active at any given time. An Active — Active cluster is a failover cluster configured in a way that both the cluster nodes are active at any given point of time.
That is, one Instance of SQL Server is running on each of the nodes always; when one of the nodes has a failure, both the Instances run on the only one node until the failed node is brought up after fixing the issue that caused the node failure.
The instance is then failed over back to its designated node. Primarily, recovery model is chosen keeping in view the amount of data loss one can afford to. If one expects to have minimal or no data loss, choosing the Full recovery model is a good choice. Depending on the recovery model of a database, the behavior of database log file changes.
Sql server interview questions and answers
I would recommend you read more material on log backups and log file behavior and so on to understand in depth. Clustered Index: Therefore table may have only one clustered index. Non-Clustered Index: The leaf nodes of a non-clustered index does not consists of the data pages.
What are the different Authentication modes in SQL Server and how can you change authentication mode? When would you use it? Explain primary key in Sql Server?
Explain foreign key in Sql Server? List out the different types of locks available in Sql Server? What is recursive stored procedure in Sql Server?
How the authentication mode can be changed? Peer-to Peer Replication Database Mirroring Explain Sql server authentication modes? Explain Indexing and what are the advantages of it?
Why to use Cursor in Sql Server? List all types of constraints in Sql Server? What are the differences between Union, Intersect and Minus operators?
Explain about Link Server in Sql Server? What are the significance of master, tempdb and model databases? Explain about unique identifier datatype in Sql Server?
Can SQL servers link to other servers? What is subquery and its properties? What are the kinds of subquery? What is SQL server agent? What are scheduled tasks in SQL Server? As you prepare for a junior level SQL Server interview. SSIS checkpoints.
SSIS Breakpoint. Be prepared for your technical interviews. How do you backup Analysis Services databases? SSIS package configurations. To the interviewers: Be sure to ask questions to understand the depth and breadth of the candidates knowledge base.
SSIS logging. Dynamic flat file connections. Many of these situations and questions will probably not be familiar to you. Flag for inappropriate content.
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Vaibhav Gore. And the database went to suspect mode. How do you troubleshoot this issue? Parameters are the same as while creating a new log file. The restores operation runs for 2 hours and failed with an error Insufficient space on the file group. Parameters are the same as while creating a new data file. Can you describe factors that causes the logfile grow? How do you troubleshoot a Full transaction log issue?
500 SQL Server Interview Questions and Answers - SQL FAQ PDF
Backing up the log. Freeing disk space so that the log can automatically grow. Moving the log file to a disk drive with sufficient space. Increasing the size of a log file. Adding a log file on a different disk.
Completing or killing a long-running transaction.
SQL Server DBA Interview Questions
Ans: No! Consider a situation where publisher database log file has been increasing and there there is just few MB available on disk. As an experienced professional how do you react to this situation? Check all database statistics are up-to-date at distributer.Adding sub-report.
What are statistics, under what circumstances they go out of date, how do you update them? SVR Technologies give SQL Server training online at your registered time, you can choose classes where, when, and how it accommodates you the best. What are different component of SSIS will you use? MAPI client is not needed for sending mails.
For example — 1. SQL Server has a feature for sending mail Stored Procedure - It is a set of T-SQL statements combined together to perform a single task formed by combining many small tasks.