Sql Server 2008 Developer Interview Questions And Answers Pdf
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- SQL Server Interview Questions and Answers Complete List Download
- Sql Server Developer Interview Questions And Answers Pdf
- SQL Server 2008 Interview Questions and Answers
- Top SQL Server Interview Questions and Answers
SQL Server Interview Questions and Answers Complete List Download
What is a deadlock and what is a live lock? Answer: A livelock is one, where a request for an exclusive lock is repeatedly denied because a series of overlapping shared locks keeps interfering. SQL Server detects the situation after four denials and refuses further shared locks. A livelock also occurs when read transactions monopolize a table or page, forcing a write transaction to wait indefinitely. What is blocking and how would you troubleshoot it?
Answer: Blocking happens when one connection from an application holds a lock and a second connection requires a conflicting lock type. This forces the second connection to wait, blocked on the first. Can we write a distributed query and get some data which is located on other server and Oracle Database? What the different Topologies in which Replication can be configured?
Answer: Replication can be configured in any topology depending on keeping given the complexity and the workload of the entire Replication. It can be any of the following:. What is lock escalation? Answer: A query first takes the lowest level lock possible with the smallest footprint row-level. When too many rows are locked requiring too much RAM the lock is escalated to a range or page lock. If too many pages are locked, it may escalate to a table lock.
What are the main differences between temp tables and table variables and which one is preferred? Answer: SQL Server can create column statistics on temp tables Indexes can be created on temp tables table variables are stored in memory up to a certain threshold. All operation must be logged in to Transaction Log files after that they should be done on to the main database. E learning Portal. What have included columns when we talk about SQL Server indexing? Answer: Indexed with included columns were developed in SQL Server that assists in covering queries.
Indexes with Included Columns are non clustered indexes that have the following benefits: Columns defined in the include statement, called non-key columns, are not counted in the several columns by the Database Engine.
Columns that previously could not be used in queries, like varchar max , can be included as a non-key column. A maximum of additional columns can be used as non-key columns. What is the difference between the 2 operating modes of Database Mirroring? High-Performance Mode is to ensure that the Principal database runs faster, by not waiting for the Mirrored database to commit the transactions.
There is a slight chance of data loss and also the Mirrored database can be lagging in terms being up to date with Principal database if there is a heavy load on the Mirrored Server.
What is an execution plan? Answer: An execution plan is basically a road map that graphically or textually shows the data retrieval methods chosen by the SQL Server query optimizer for a stored procedure or ad-hoc query and is a very useful tool for a developer to understand the performance characteristics of a query or stored procedure since the plan is the one that SQL Server will place in its cache and use to execute the stored procedure or query.
If this option is turned on it will display a query execution plan in a separate window when a query is run again. MINUS — returns all distinct rows selected by the first query but not by the second.
UNION — returns all distinct rows selected by either query. The job activity monitor displays the current status of all the jobs on the instance. Choose the particular job which failed, right-click and choose view history from the drop-down menu. The execution history of the job is displayed and you may choose the execution time if the job failed multiple times during the same day.
What the different types of Replication and why are they used? For example, Snapshot Replication is useful only when the data inside the tables does not change frequently and the amount of data is not too large, such as a monthly summary table or a product list table, etc. Transactional Replication would useful when maintaining a copy of a transactional table such as sales order tables etc.
Can we hide the definition of a stored procedure from a use? How can we determine what objects a user-defined function depends upon?
Can one drop a column from a table? What is Fill Factor? How SQL Server executes a statement with nested subqueries? Answer: When SQL Server executes a statement with nested subqueries, it always executes the innermost query first. This query passes its results to the next query and so on until it reaches the outermost query.
It is the outermost query that returns a result set. What is Data-Warehousing? Answer: Subject-oriented, meaning that the data in the database is organized so that all the data elements relating to the same real-world event or object are linked together; Time-variant, meaning that the changes to the data in the database are tracked and recorded so that reports can be produced showing changes over time; Non-volatile, meaning that data in the database is never over-written or deleted, once committed, the data is static, read-only, but retained for future reporting.
What are the different Types of Join? The size of a Cartesian product result set is the number of rows in the first table multiplied by the number of rows in the second table. A common example is when a company wants to combine each product with a pricing table to analyze each product at each price.
Inner Join A join that displays only the rows that have a match in both joined tables is known as inner Join. This is the default type of join in the Query and View Designer.
Outer Join A join that includes rows even if they do not have related rows in the joined table is an Outer Join. You can create three different outer joins to specify the unmatched rows to be included: Left Outer Join: In Left Outer Join all rows in the first-named table i. Unmatched rows in the right table do not appear. Unmatched rows in the left table are not included. Self Join This is a particular case when one table joins to itself, with one or two aliases to avoid confusion.
A self-join can be of any type, as long as the joined tables are the same. A self-join is rather unique in that it involves a relationship with only one table. The common example is when a company has a hierarchal reporting structure whereby one member of staff reports to another. Why you need indexing? For what purpose we are using view? Every object that has been created on Schema is Schema objects like Table, View, etc.
If we want to share the particular data with various users we have to use the virtual table for the Base table. So that is a view. Indexing is used for faster search or to retrieve data faster from various tables. Schema containing a set of tables, basically schema means logical separation of the database. The view is created for faster retrieval of data. Only the drawback is..
How do you open a Cluster Administrator? Answer: OSQL is a command-line tool that executes the query and displays the result same a query analyzer but the query analyzer is graphical and OSQL is a command-line tool. OSQL is quite useful for batch processing or executing remote queries. What is the OSQL utility? Answer: OSQL is a command-line tool that is used to execute a query and display the result same a query analyzer but everything is in command prompt. What is a correlated subquery?
Answer: When a subquery is tied to the outer query. Mostly used in self joins. What factors you will consider calculating the storage requirement for that view? Storage is required to store Index, in case you are developing an indexed view. What are the pros and cons of putting a scalar function in a queries select list or in the where clause?
Answer: Should be avoided if possible as Scalar functions in these places make the query slow down dramatically. You are being assigned to create a complex View and you have completed that task and that view is ready to be getting pushed to the production server now. How important do you consider cursors or while loops for a transactional database? Answer: I would like to avoid cursor in the OLTP database as much as possible, Cursors are mainly only used for maintenance or warehouse operations.
Is it possible to update the Views? If yes, How, If Not, Why? Answer: Yes, We can modify views but a DML statement on a join view can modify only one base table of the view so even if the view is created upon a join of many tables, only one table, the key preserved table can be modified through the view. One can apply 2 or as many parameters, but it returns only the first non NULL parameter,.
If we drop a table, does it also drop related objects like constraints, indexes, columns, defaults, Views, and Stored Procedures? What are the recovery models for a database?
Answer: There are 3 recovery models available for a database. Full, Bulk-Logged and Simple are the three recovery models available. How will you go about resolving deadlocks? Each process would wait indefinitely for the other to release the lock unless one of the user processes is terminated. What is the optimal Disk configuration for a database server and what RAID configurations would you use if budget is not a constraint?
What are the steps you will take to improve the performance of a poor performing query? Answer: This is a very open-ended question and there could be a lot of reasons behind the poor performance of a query. But some general issues that you could talk about would be: No indexes, table scans, missing or out of date statistics, blocking, excess recompilations of stored procedures, procedures, and triggers without SET NOCOUNT ON, poorly written query with unnecessarily complicated joins, too much normalization, excess usage of cursors and temporary tables.
Sql Server Developer Interview Questions And Answers Pdf
Here, in this list of the top SQL Server interview questions, you will learn the most important interview questions to clear your SQL Server interview. SQL is one of the most common skills that recruiters look for not only in IT-related jobs but also in various other job profiles, including business, finance, insurance, and other domains. Following are some of these frequently asked SQL Server interview questions in the corporate world:. How can SQL Server instances be hidden? How can we check whether the port number is connecting or not on a Server DBA? How can you start SQL Server in different modes?
An interview is a very important event for any person. A good interview leads to a good career if the candidate is willing to learn. I always enjoy interview question and answer series. This is my very humble attempt to write SQL Server interview questions and answers. SQL Server is a very large subject and not everything is usually asked in an interview. I have listed the entire series in this post so that it can be easily downloaded and used.
What is a deadlock and what is a live lock? Answer: A livelock is one, where a request for an exclusive lock is repeatedly denied because a series of overlapping shared locks keeps interfering. SQL Server detects the situation after four denials and refuses further shared locks. A livelock also occurs when read transactions monopolize a table or page, forcing a write transaction to wait indefinitely. What is blocking and how would you troubleshoot it? Answer: Blocking happens when one connection from an application holds a lock and a second connection requires a conflicting lock type. This forces the second connection to wait, blocked on the first.
SQL Server 2008 Interview Questions and Answers
This tip has interview style questions graded as either easy, moderate or advanced related to T-SQL, the relational engine programming language. Check out the questions and answers to help gauge your skills. Good luck! When you don't know, you know where to study!!!
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Top SQL Server Interview Questions and Answers
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Interview Questions and Answers are now updated with the latest questions and answers. I enjoyed writing questions and answers. I have gotten many emails about complete series. Top most requests were to collect series in one big post so they can be easily used. I was asked to provide links to download them so they can be printed and referred. Another question I received is done I ask the same questions in interviews which I administrate. The answer is YES.
Download PDF 1. What are the two authentication modes in SQL Server? There are two authentication modes — Windows Mode Mixed Mode Modes can be changed by selecting the tools menu of SQL Server configuration properties and choose security page. This is mainly used to capture and save data about each event of a file or a table for analysis. What is recursive stored procedure? SQL Server supports recursive stored procedure which calls by itself.
1. What are the two authentication modes in SQL Server? Top 50 SQL Server Interview Questions & Answers. Details: Last Updated: 21 February Download PDF. 1. How exceptions can be handled in SQL Server Programming? For SQL Server Index can be used as maximum number per table.