SQL SERVER INTERVIEW QUESTIONS AND ANSWERS BOOK

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This book will flow in a "Question & Answer" mode from start to finish to help you grasp concepts faster and get to the point quickly. Once you understand the. SQL Server Interview Questions and Answers [Pinal Dave, Vinod Kumar] on kaz-news.info *FREE* shipping on qualifying offers. This book will flow in a Question. kaz-news.info: SQL Server Interview Questions & Answers eBook: Neelan Joachimpillai: Want to know our Editors' picks for the best books of the month?.


Sql Server Interview Questions And Answers Book

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Sql Server Interview Questions And Answers book. Read 6 reviews from the world's largest community for readers. SQL Server. Interview Questions and Answers. For All Database Developers and. Developers Administrators. Pinal Dave. kaz-news.info Vinod Kumar. Within the first few pages of reading SQL Server Interview Questions and Answers by Pinal Dave and Vinod Kumar, though, it jumped out and.

Q What is the main difference between a Clustered and Non-Clustered index structure? A Non-clustered index is different from a Clustered index in that, the underlying table rows will not be stored and sorted based on the Non-clustered key, and the leaf level nodes of the Non-clustered index are made of index pages instead of data pages.

The index pages of the Non-clustered index contain Non-clustered index key values with pointers to the storage location of these rows in the underlying heap table or the Clustered index.

Q What is the main difference between a Non-clustered index that is built over a Heap table and a Non-clustered index that is built over a Clustered table? The RID consists of the file identifier, the data page number, and the number of rows on that data page. On the other hand, if a Non-clustered index is created over a Clustered table, the leaf level nodes of that index contain Non-clustered index key values and clustering keys for the base table, that are the locations of the rows in the Clustered index data pages.

A RID Lookup operation is performed to retrieve the rest of columns that are not available in the index from the heap table based on the ID of each row. A Key Lookup operation is performed to retrieve the rest of columns that are not available in the index from the Clustered index, based on the Clustered key of each row, For more information, see the article: Designing effective SQL Server non-clustered indexes.

The INCLUDE feature extends the functionality of Non-clustered indexes, by allowing us to cover more queries by adding the columns as non-key columns to be stored and sorted only in the leaf level of the index, without considering that columns values in the root and intermediate levels of the Non-clustered index. In this case, the SQL Server Query Optimizer will locate all required columns from that index, without the need for any extra lookups.

Q Which type of indexes are used to maintain the data integrity of the columns on which it is created? Unique Indexes, by ensuring that there are no duplicate values in the index key, and the table rows, on which that index is created. Q How could we benefits from a Filtered index in improving the performance of queries? It uses a filter predicate to improve the performance of queries that retrieve a well-defined subset of rows from the table, by indexing the only portion of the table rows.

The smaller size of the Filtered index, that consumes a small amount of the disk space compared with the full-table index size, and the more accurate filtered statistics, that cover the filtered index rows with only minimal maintenance cost, help in improving the performance of the queries by generating a more optimal execution plan.

Q What are the different ways that can be used to retrieve the properties of the columns participating in a SQL Server index? The problem with gathering the indexes information using the UI method is that you need to browse it one index at a time per each table.

You can imagine the effort required to see the article: all indexes in a specific database. The sys.

It is recommended to join sys. For more information, see the article: Gathering SQL Server indexes statistics and usage information.

SQL Server Interview Questions and Answers – Book Review

Q How can we get the fragmentation percentage of a database index? Checking the fragmentation percentage of all indexes in a specific database, using the UI method requires a big effort, as you need to check one index at a time. Q When checking the index usage statistics information, retrieved by querying the sys.

Q What is the difference between index Rebuild and Index Reorganize operations? Indexes help to make a row unique or without any duplicate.

SQL Server Interview Questions

Some disadvantages can be: Indexes take additional space; thus, disk size is being occupied. An index can slow down the basic operation like insert, delete, update but if where the condition has an index field, then update operation can be faster.

Insert, delete, or update becomes slower since after each operation index must be updated. Answer: There are the certain set of rules which would decide how data needs to be sorted and compared in a database. These rules can be referred to as Collation.

Example — Character data is sorted using rules that defines the right character sequence, with an option for specifying case sensitivity, character width etc. So, by default collation is case insensitive, thus all database in it is also case-insensitive, Q9 What is a cursor and what are its different types? A cursor is a database object, which can utilize to retrieve the data, one row at a time from the resultset.

When data needs to be updated row-by-row, cursors can be very handy. The cursor life cycle consists of mainly 5 steps.

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Declaring cursor — declared by defining SQL statement. What do you mean by authentication modes in SQL Server? There are two authentication modes in SQL Server.

How can we check the SQL Server version? Is it possible to call a stored procedure within a stored procedure? Yes, we call a stored procedure within a stored procedure It is called recursion property of SQL server and these type of stored procedures are called nested stored procedures. SQL Server agent allows us to schedule the jobs and scripts. It helps is implementing the day to day DBA tasks by automatically executing them on a scheduled basis.

The primary key is a column whose values uniquely identify every row in a table.

SQL Server Interview Questions and Answers

Primary key values can never be reused. The unique key constraints are used to enforce entity integrity as the primary key constraints. Foreign Key constraints enforce referential integrity. They are used to enforce domain integrity. What are a Scheduled Jobs? The scheduled job allows a user to run the scripts or SQL commands automatically on the scheduled basis.

The user can determine the order in which commands need to execute and the best time to run the job to avoid the load on the system.

What is a heap? A heap is a table that does not contain any clustered index or non-clustered index. What is BCP? BCP or Bulk Copy is a tool by which we can copy a large amount of data to tables and views.

BCP does not copy the structures same as source to destination. What is Normalization? The process of table design to minimize the data redundancy is called normalization.Friend Reviews. Q What is the difference between index Rebuild and Index Reorganize operations?

Answer: There are the certain set of rules which would decide how data needs to be sorted and compared in a database. Q How can we get the fragmentation percentage of a database index? They get stored in System Catalog Views sys. Possible clean ex-library copy, with their stickers and or stamp s. Non-clustered indexes have their own storage separate from the table data storage.

site Drive Cloud storage from site. Values can change within a specific transaction of a SQL function. Nakul rated it it was amazing Feb 04,