SQL Interview Questions

This article shows how to create another filegroup and move existing tables into the new filegroup . I have used the AdventureWorks2008R2 demo database which can be downloaded from the CodePlex website.See full article ». SQL Server has several fixed database roles such as db_datareader and db_datawriter, which grants the user read and write access respectively to all the tables in the database. Curiously there is no role to grant a user permission to execute stored procedures, but fortunately this is easily created as explained in this tip.See full article ».

  • Primarily, the recovery model is chosen keeping in view the amount of data loss one can afford.
  • It’s a collection of data or arrangement of data at a central point, and it is arranged in such a manner that it can be easily managed.
  • The query optimizer is used to coordinate the study of queries with the workload and the best use of queries is suggested based on this.

This is where you will need to explain the function of the truncate and delete commands. ‘Truncate’ offers speedy deletion of data contained in a table, while ‘delete’ deals with individual rows and takes heed of relevant triggers to remove info from elsewhere as necessary. There are both local temp tables created for as long as an individual user is connected to the database, as well as global temp tables that persist until every user has disconnected.

What does a typical day look like at WellData?

In the left pane of the tool, I would select SQL Server Services, the right side pane displays all of the SQL Server Services/components that are installed on that machine. If the Service is displayed as , then it indicates it is a default instance, else there will be the Instance name displayed. Full, Bulk-Logged, and Simple are the three recovery models available.

  • Familiarize yourself with basic commands such as SELECT, INSERT, UPDATE, and DELETE.
  • Assisting clients with infrastructure-based problems is a massive part of Luke’s role.
  • The Standard Edition of SQL Server has a limitation on the number of sockets that can be used.
  • In your answer include what you learnt from the project, what you enjoyed and what the main challenges were and how you overcame these.

In this database management system, all object related concepts can be directly supported in query language. Today’s popular databases like MS-SQL, DB2, Oracle, and MySQL support these DBMS. These databases are well known for following ACID property (where A-Atomicity, C-Consistency, I-Isolation, D-Durability).

Answers 11 to 20 01:04

You are unable to use more than 4 sockets, but many clients assign more to their VM’s, and unknowingly effect the performance levels while wasting money on licensing a system which is unable to function at full capacity. This is a repeat offender and a leading challenge which has led us to introduce SQL Server Health Checks, to ensure optimum configuration for performance, reliability and security. If you wish to further develop your SQL skills and apply for your dream job check out our SQL training courses. Explain the difference between a primary key and a unique key.

Is SQL DBA easy or hard?

How Quickly Can You Learn SQL? Generally speaking, SQL is an easy language to learn. If you understand programming and already know some other languages, you can learn SQL in a few weeks. If you're a beginner, completely new to programming, it can take longer.

Fortunately we can use “Execute As” to resolve this.See full article ». For Luke, the most interesting part of his career as a senior database administrator is getting stuck in with problem-solving and dealing with performance issues, as it allows him to focus entirely on a single project. A synonym is an alternate name or alias for a database object such as a table, function, view, stored procedure, etc. that may exist on a local or remote server. To give you an idea, the following are some of the most commonly asked SQL interview questions for entry-level positions. 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 concepts, it gets easier to see twists using that concept within a scenario and to ultimately solve them.


Storing committed transactions in the cache provides a performance gain for SQL Server. However, you do not want the transaction log to get too big because it might consume too many resources and, should your database fail, take too long to process to recover the database. An interviewer will ask this question for multiple reasons, they want to know how advanced your SQL knowledge is, but also how you deal with difficult situations. You want to attend an interview prepared with an example of a SQL project you’ve previously worked on.

How do I prepare for SQL Server DBA interview?

  1. What purpose does the Model Database Serve?
  2. Explain your SQL Server DBA Experience?
  3. What is DCL?
  4. What is Replication?
  5. Why would you use SQL Agent?
  6. What is DBCC?
  7. What are the recovery models for a database?
  8. What is the importance of a recovery model?

If you’re interviewing for a slightly more experienced SQL role, employers may ask questions to explore the extent of your SQL query knowledge, here are some example SQL query interview questions and answers. Common SQL interview questions include those related to databases, tables, primary keys, how to become a sql server dba foreign keys, joins, subqueries, views, indexing, normalization, and denormalization. If you’re interviewing for a SQL role related to SQL servers, an employer may ask questions to find out the extent of your SQL Server knowledge, here are some example SQL Server interview questions and answers.

Answers from 1 to 10 03:29

Assisting clients with infrastructure-based problems is a massive part of Luke’s role. One of the largest problems that Luke has witnessed involves the CPU cores assigned to a SQL Server. The Standard Edition of SQL Server has a limitation on the number of sockets that can be used.

sql dba interview questions


Best Network Automation Tools for 2023 » Roger Perkin

Some might even imagine that all distributions are effectively the same. One other distinction is how the operating system manages optional software updates and patches. Many (but not all) of the systems on the above list use the RPM (previously known as the Red Hat Package Manager). If you’re working with large data centers, you’ll need to deploy and integrate several services across multiple clouds continuously. Red Hat Enterprise Linux simplifies the migration process allowing you to easily port over to the service irrespective of your previous Linux distribution.

best linux distro for network engineers

Alternatively, you also have the option of working in a general role as a DevOps engineer. According to data from Glassdoor, the average annual salary for a Linux Systems Administrator is £41,351 in the UK. The lower end of the range of these salaries is around £28,000 and the upper end of the salary band for Linux administrators is £61,000, so it’s a role with a lot of potential for growth. We have built a vast database over our lifetime with regular engagement with top quality candidates enabling us to deliver the best people who may not necessarily be active in the job market. Candidates who trust us because of our reputation and clients who are safe in the knowledge we can provide them with the best talent. Buyers will use the essential and nice-to-have skills and experience to help them evaluate suppliers’ technical competence.

Network Automation Software

There is no “Debian Inc” or “Debian plc”, and thus no vendor support available, but there are plenty of third party companies that support Debian. Software for Linux is typically provided in “packages”, and the number of packages available varies greatly between distributions. Raspberry Pi OS(previously called Raspbian) is a Linux distro that is optimized for the Raspberry Pi hardware. It is the official operating system for the Raspberry Pi and comes with a wide range of software that is suitable for education, programming, and general use. It provides a programming environment for Raspberry Pi software development. Fedora Workstation is a popular choice for server programmers due to its stability and wide range of software packages.

Because anyone can create a Linux distribution from the available source code, and they can choose from some variations of components, there are many distributions of Linux that are very similar. Some distributions come from different companies but are effectively interchangeable. On the other hand, Red Hat favours stability and performance over support. So, while it doesn’t come with several features and frequent updates, it’s highly reliable, stable, and lightweight.

Implementing Cisco Collaboration Cloud and Edge Solutions (CLCEI v1. Training

Network automation tools can be used to manage a variety of network devices, including switches, routers, firewalls, load balancers, and more. They can help network administrators and engineers to reduce manual errors, improve network security, increase network uptime, and optimize network performance. If you are looking for network engineer software tools, Ansible is one of the best network automation tools, if you can do it on the CLI then you can get Ansible to automate it. The Linux operating system is used in a wide variety of systems and environments. It powers large cloud infrastructure environments, on-premises converged infrastructure appliances, application servers, desktop computing environments, and embedded systems.

You will also get in touch with the new RISC-V system-on-chip (SoC) SW as provided by SoC vendor. New customer requests may offer an opportunity to design and implement new software. This gives the chance to drive your SW pull request through the open sourcing process.

Senior Embedded Software Engineer

It gives more priority to focus on the latest versions and features for the particular usage. In addition, you can use Ubuntu on different devices and servers such as PCs, tablets, and even on smartphones. In addition, Ubuntu uses the Advanced Package management Tool (APT) package manager of Debian, which is a powerful tool for software management.

Which Linux OS is fastest?

  1. Absolute Linux. Absolute Linux is a light and fast desktop distro that comes out of the box with LibreOffice suite and the Firefox browser.
  2. antiX Linux.
  3. Linux Lite.
  4. Lubuntu.
  5. Puppy Linux.
  6. SliTaz.
  7. LXLE.
  8. Porteus.

The majority of commercial Linux software that mentions a specific Linux distribution will be certified for RHEL, although it will often run on other Linux distributions. Activereach provided Crown Golf with an innovative solution to lower our costs for e-mail and web filtering. Network protectionReceive additional levels of security exclusive to Cumulus Linux in addition to industry-standard security features.

Complete standardizationReduce complexities and get complete interoperability with Linux across your entire data centre. We want our customers to be inspired and whatever they are looking for, we’re finding bigger and better ways to provide it. Login or create a free user account to upload your CV and shortlist jobs.

Canonical offers different Ubuntu versions optimised for flexibility or lightness, depending on your hardware constraints and needs. Ubuntu is built with security in mind and can be deployed very easily on most hardware platforms. From Apache Spark and Hadoop to Kubeflow support on bare metal or public clouds.

To support high performance for Oracle Database, Oracle engineers have made continuous improvements to the Unbreakable Enterprise Kernel. Although these improvements were intended for Oracle Database, they typically benefit any compute- or memory-intensive application. Some users have reported a more than 30 percent performance improvement from this variant of the Linux kernel. For many customers, the operating system is at the bottom of a stack of software platforms, with their business applications at the top. This can make it seem as if the operating system is less important than the higher layers in the stack, so it doesn’t matter which distribution you choose.

  • We provide regular updates and upgrades through Long-Term Support (LTS) releases with a schedule you can trust.
  • Some distributions include additional options such as a high-performance Linux kernel, management tools, a hypervisor, or even components for a cloud native environment.
  • It is based on Arch Linux and has a lot of the same features, but is much easier to install and use.
  • (However, staff have opportunity to work at other offices as well as their home where circumstances require. Staff will also be required to occasionally travel on business to other parts of UK and abroad where necessary).
  • With the free option your code is visible to the public which is great for personal projects or code you are happy to have in the public domain.
  • So, while it doesn’t come with several features and frequent updates, it’s highly reliable, stable, and lightweight.

Ansible network automation allows network engineers to achieve greater efficiency, consistency, and reliability in managing network infrastructure. It can help reduce the risk of human error, improve network uptime, and increase the speed of network deployments and updates. Additionally, Ansible network automation can be easily integrated with other automation tools and platforms, making it a versatile tool for network automation.


Top 10 IT Certifications for Java Developers in 2023

Choice D is incorrect because SQL injection is not applicable here because of the proper use of PreparedStatement with bind variables here. SQL injection is a common attack that consists of insertion of SQL code via input data from the client application. Ersed with agile methodology and has handled scrum meetings based on the requirements from her different roles.

  • Javin paulsaid…If you are starting with Spring and don’t know Java then I suggest you spend sometime learning Java.
  • Choice B is incorrect because the reference four is set to null in line 7 and this has no effect on GC.
  • If you find these best IT certifications for Java Programmers useful and valuables, then please share them with your friends and colleagues.
  • If we want to include letters in a formatted string, we must put them in single quotes, such as ‘Timezone’.
  • As per the Oracle Java Specification, an instance method in a subclass with the same signature and return type as an instance method in the superclass overrides the superclass’s method.

The Thread class doesn’t have a constructor that accepts a Callable argument; hence, option A is false and hence the correct answer. The Files class includes two methods for walking the directory tree using a depth-first search. Choice E is incorrect because there is no such rule that a null value cannot be assigned to an exception variable. Also, note that calling System.gc() has no effect on eligibility for garbage collection. Choice B is incorrect because the reference four is set to null in line 7 and this has no effect on GC. A Set is an unordered collection with no duplicate elements.

Java EE 7 Application Developer (1Z0–

It comes in the second level of Oracle’s Java Certification list. Without further ado, here is my list of top 10 certifications Java developers can take in 2023. Large-scale development and service firms have different critical applications and systems to develop, manage, and maintain.

Is Java SE 11 certification hard?

It's indeed one of the difficult certifications to crack, and It's much harder than OCAJP 8; it's the predecessor, and some of the programmers who have attempted it call it even harder than OCPJP 8, a professional-level certification.

The service provider interface specifies what behavior the service will have. A service locator is able to find the classes that implement a service provider interface. The method specifies the Exception class in its declaration; thus, it can throw any checked exception. In contrast, the method doesn’t specify any exception class and cannot throw a checked exception.

Frequently Asked Questions

IT managers often use the OCP credential to evaluate the qualifications of employees and job candidates. “Java SE 11 Developer Exam”, also known as 1z0-819 exam, is a Oracle certification exam. Discover the NetBeans debugger, args array and the ArrayList class, and ArrayList classes. Discover the JDBC API, java se 9 certification connecting to databases, calling a resource bundle from an application, and changing locales and formatting text for localization. Discover how to implement parallelism with the Fork-Join framework and it covers using parallel streams. Discover how to work with date and time values using the java.time API.

Is there Java 17 certification?

An Oracle Certified Professional: Java SE 17 Developer has demonstrated proficiency in Java (Standard Edition) software development recognized by a wide range of world-wide industries.

Practical training and programming experience, Maaike has a lot of experience with short technical consulting projects and providing learning solutions for complex software development departments. This path will prepare you for the Java SE 11 Developer Certification (1Z0-819). Candidates who hold this certification have demonstrated proficiency in Java and exhibit broad knowledge of the Java programming language, coding practices and utilization of new features incorporated into Java SE 11. Discover how to work with methods, including method overloading.

Zeal is one of the renowned Premium Instructor at Udemy. Zeal works primarily as a Cloud Security Consultant and helps…

The unchecked warning is suppressed for the list local variable only. Indicates that the named compiler warnings should be suppressed in the annotated element . Note that the set of warnings suppressed in a given element is a superset of the warnings suppressed in all containing elements. For example, if you annotate a class to suppress one warning and annotate a method to suppress another, both warnings will be suppressed in the method. Option C is incorrect because the ServiceLoader class doesn’t have a public constructor. When you create a SimpleDateFormat object, a pattern String is specified, whose contents determine the format of the date and time.

  • It is a professional-level certification program provided by Oracle for Java developers.
  • The certification typically builds upon the fundamental skills of the OCA and the more advanced skills of the OCP.
  • You will also be assessed on your ability to work with services, migrate applications from previous Java versions, work with java.util.concurrent collections, and write thread-safe code.
  • Vouchers can also be purchase from an authorized Oracle Partner.
  • OCPJAD is ideal for desktop application developers, frontend + backend app developers, software engineers, and application architects.

You can also take this certification along with Spring because Spring MVC internally relies on Servlet, JSP, and JSF. But, that’s not a hard and fast rule; for example, if you think you are good at Spring, you can go to straight Spring certification, but it looks better in your resume if you have a core Java certification. The list includes mandatory Java certifications like Java SE 11 Developer Certification and other popular IT certifications on Java-related technologies like Spring, Scala, Apache Spark, Docker, Kubernetes. If you are a Java developer and wondering which IT certification you can do to take your career to the next level, then you have come to the right place. Javin paulsaid…Yes, of course, if you don’t have working experience then focus on certifications and personal projects, these two are great credential and definitely help in jobs and career. The Project Management Professional is one of the most reputed, globally recognized professional management courses offered by the Project Management Institute .