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.
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What are some fair questions to ask as a portion of the interview process? I want to make sure we hire someone who has a good base of knowledge. Do you have any suggestions? Solution Trying to assess any technical person's skill set can be difficult. An interview process with appropriate questions for your environment and the correct skill set are key.
Capture any problems by capturing the events on production environment so that they can be solved.
What Is Copyonly Data Backup? How This Is Useful? This is used to service 'on demand' Backup requests from end users. This gives us easy restore paths as well in case of DR process. In this Replication topology each node is Publisher, Distributor and Subscriber. This increases availability of the database system and Failure of any node does not impact the health of Replication process. This topology also offers automatic conflict detection and correction. Hence, recommended in Realtime.
As uses needs to be disconnected every time Restore Job runs to ensure timely shipping of Transaction Logs its recommended not to use this option for regular, less interval Log Shipping configurations. When Does Error Occur? Answer : The error comes when you are trying to restore the DB which already exists. Answer : Database Mirroring is to be configured with TCP Protocol and ensure that data over each endpoint is encrypted.
Better to make use of TDE for more security. Answer : SQL services will be in manual and stopped.
Cluster service will be in automatic and started mode on both the nodes. Answer : Yes resources can be moved after pausing the node. But we can't move them back till the node is paused. Answer : This can be started on both the nodes as this doesn't have any dependency on SQL service or any resource which is possessed by active node.
What Is Data Compression? Numeric data types and fixed length strings are stored in variable-length storage format, just like Varchar. Stored procedure is cached in SQL Servers memory. So it helps to reduce the server overhead.
It also enhances application performance. Stored procedures help us in the encapsulation of the code. The code of the stored procedure can be changed without affecting application. Test your sql server knowledge with our multiple choice questions!
Lock escalation is the process of reducing the overhead of the system by converting many fine grain locks into fewer coarse grain locks. Lock escalation threshold is determined dynamically by SQL server.
It doesnt require any configuration hassles as SQL Server choose to keep lock on both row and column for the page query. RAID stands for Redundant array of independent disks which was earlier called as Redundant array of inexpensive disks. It is a storage technology that has one logical unit consisting of multiple disk drive components. It increases the performance by replicating and dividing the data through many levels between multiple physical drives.
There are 12 Raid Levels which are as follows: - Level 0: it is a 'striped' disk array provides data stripping without fault tolerance.
Multiple mirrors are created and then stripes over it. Due to this values in the unique key columns may or may not be NULL. What is bit data type and what's the information that can be stored inside a bit column?
It is used to store the boolean information of the form 1 true or 0 false. Define candidate key, alternate key, and composite key. It identifies each row of a table as unique. It can become the primary key of the table as well.
Every tabular relationship will have atleast one candidate key. Unique keys also termed as alternate keys which prevent incorrect data from entering the table. This gives assurance of uniqueness of data when the columns are joined together. ACID is used in database and it includes the following properties such as atomicity, consistency, isolation and durability.
These properties allow easy, reliable and secure database transaction.