Are you preparing for SQL Server Architecture job interview and wondering what questions you might be asked? In this blog we have hand-picked the questions you are likely to be asked in SQL Server Architecture job interview and provided to-the-point answers to each one of them so as to help you prepare better for SQL Server Architecture job interviews.
Always keep in the mind that, only academic knowledge is not enough to crack an interview. Employers expects from the candidate to have practical knowledge and hands-on experience as well. This SQL Server Architecture Interview Questions designed by industry expert will help you to gain practical knowledge of SQL Server.
Answer: RAID stands for Redundant Array of Independent Disks. RAID defines data storage schemes to divide and replicate data among various disks so that data reliability and I/O performance can be increased.
The basic configurations of RAID are:
LEVEL 0 : Striped set without parity/Non-Redundant Array
LEVEL 1 : Mirrored set without parity
LEVEL 2 : Redundancy through Hamming code
LEVEL 3 : Striped set with dedicated parity/Bit interleaved parity
LEVEL 4 : Block level parity
LEVEL 5 : Striped set with distributed parity
LEVEL 6 : Striped set with dual distributed Parity
Answer: Database architecture describes the design of the database. It explains how the data is stored. The data of the server is stored in databases. This database is further split into one or more discs. The database can be considered to have two layers. Physical layer, which is a transparent layer for the database administrators to work on. Other users typically work on the user view layer. Tables, views, procedures forms this view
Answer: A page is a unit of data storage in SQL. The size of a page is 8Kb. A page has a header and a body. Different types of pages are: Date, text, index , page free space etc. The data rows are put on the page serially after the header.
Extents are units in which space is allocated to tables and indexes. An extent is 8 continuous pages. SQL Server has two types of extents: uniform and mixed extent. For efficient allocation, the SQL server does not allocate whole extents to tables with small amounts of data
Answer: The system database contains information/metadata for all database present on an SQL Server instance. The system database stores information regarding logins, configuration settings, connected servers etc. It also holds various extended stored procedures to access external processes and applications.
Major system databases :
Answer: When there is not enough room on a page for a new row, a Server splits the page, allocates a new page, and moves some rows to the new page
Answer: Database objects such as tables, primary key, and foreign key describe the structure of the content of a database. These objects also represent the properties of a server. Server side objects are objects that reside on the server but not in the database. Typical examples of server side objects include, logins, user defined error messages etc. The database objects are contained in the database project while the server objects are contained in the server project. These objects are defined in a .sql file. Most of these objects are defined in a separate file depending on the scenario. E.g it is necessary to specify columns in the same file where the table is defined
Answer: The physical database architecture describes how the database and files are organized in a SQL server.
Answer: It is a template database used in the creation of new database.
Answer: The logical components are usually used to connect to the database. Any object that a user can use to access or connect to the database is a logical component. Triggers, tables, procedures, views, keys etc are typical examples
Answer: It stores temporary objects like temporary tables and temporary stored procedure.
Answer: CUBE generates a result set that represents aggregates for all combinations of values in the selected columns.
ROLLUP generates a result set that represents aggregates for a hierarchy of values in the selected columns.
Answer: It stores information related to database backups, DTS packages, Replication, SQL Agent information, SQL Server jobs.
Views can be created referencing tables and views only in the current database.
A view name must not be the same as any table owned by that user.
You can build views on other views and on procedures that reference views.
Rules or DEFAULT definitions can't be associated with views.
Only INSTEAD OF triggers can be associated with views.
The query that defines the view cannot include the ORDER BY, COMPUTE, or COMPUTE BY clauses or the INTO keyword.
You cannot define full-text index definitions for views.
You cannot create temporary views
You cannot create views on temporary tables.
Answer: Master database is system database. It contains information about server’s configuration. It is a very important database and important to backup Master database. Without Master database, server can't be started.
Since a view is a virtual table – columns of the view cannot be renamed. To change anything in the view, the view must be dropped and create again.
The select statement on the view cannot contain ORDER BY or INTO TEMP
When a table or view is dropped, any views in the same database are also dropped.
It is not possible to create an index on a view
It is not possible to use DELETE to update a view that is defined as a join.