Exam DP-420 still concerns developers building reliable systems on Azure Cosmos DB, but the Microsoft credential no longer has precisely the same emphasis as older cloud-native application guides. On October 6, 2026, Microsoft changed its designation to Azure Cosmos DB AI Developer Associate and expanded the tested scope to include retrieval, vector and hybrid search, […]

Administering Azure SQL begins with a decision that changes almost every operational responsibility: which SQL deployment model actually fits the workload? Azure SQL Database, Azure SQL Managed Instance, and SQL Server on Azure Virtual Machines all support relational data, but they offer different degrees of platform management, instance compatibility, operating-system control, and recovery responsibility. Selecting […]

Before diving into practice questions, developing a clear understanding of how the DP-300 examination is structured and what it actually measures will help you approach both the practice questions and the real examination with greater strategic clarity. The DP-300 certification validates the skills required to administer, manage, and optimize Microsoft Azure SQL solutions across three […]

A DP-300 roadmap should show how a candidate becomes capable of operating an Azure SQL workload, not merely how many pages have been read. Microsoft’s current Administering Microsoft Azure SQL Solutions guide, updated for skills measured on October 27, 2026, covers resource planning, security, monitoring and optimization, task automation, and high availability/disaster recovery. A useful […]

Microsoft retired Exam DP-203, Data Engineering on Microsoft Azure, on March 31, 2025. It can no longer be booked for the Azure Data Engineer Associate credential. This article is a historical technical guide to the services and design decisions formerly covered by DP-203, such as Synapse, Azure Data Factory, storage, streaming and security. Professionals pursuing […]

Historical certification guide. Microsoft retired Exam DP-203, Data Engineering on Microsoft Azure, and the associated Azure Data Engineer Associate certification on March 31, 2025. This article retains its original title and URL as a historical learning resource. You can no longer register for DP-203 or renew the retired credential. The technical services and architectural practices […]

DP-200, Implementing an Azure Data Solution, is a retired Microsoft data-engineering exam from an earlier Azure certification pathway. Its associated English-language courseware was retired on August 31, 2021. The successor DP-203, Data Engineering on Microsoft Azure, was itself retired on March 31, 2025. A title advertising a new DP-200 preparation course must therefore be read […]

Older Azure data-engineering exam materials can describe a legitimate historical learning sequence without offering a currently bookable examination. DP-200, Implementing an Azure Data Solution, was part of the earlier two-exam Azure Data Engineer Associate route. Microsoft subsequently introduced DP-203, Data Engineering on Microsoft Azure, but that assessment and its associated certification retired on March 31, […]

Exam DP-100, Designing and Implementing a Data Science Solution on Azure, and the related Azure Data Scientist Associate certification retired on June 1, 2026. This article retains its original historical title and URL to explain what that exam taught; it is no longer a guide to booking or passing an available DP-100 assessment. Microsoft introduced […]

Production container engineering is not just making an image run. Reproducibility, least privilege, filesystem persistence, traffic boundaries, resource budgets, observability and rollback all affect whether an application behaves safely when it leaves a developer’s laptop. Docker Engine, Compose and Swarm solve different deployment problems: Compose is convenient for grouped services; Swarm mode manages services across […]

Docker Engine still includes Swarm mode as a cluster orchestrator. Docker’s current documentation recommends Compose when an application does not need a Swarm runtime; Swarm mode should not be confused with the older Docker Classic Swarm project. In Swarm mode, manager nodes maintain desired state through Raft, and workers execute tasks. Availability must be evaluated […]

A container image is a versioned filesystem and metadata artifact, not a miniature virtual machine. Good Docker builds produce predictable results, minimize unnecessary runtime packages, protect build-time secrets and make the artifact traceable to source. Docker’s current guidance emphasizes multi-stage builds, deliberate caching, .dockerignore, non-root users and BuildKit secret mounts rather than embedding credentials in […]

Docker packages applications and their dependencies as images that run as isolated processes. An image is a versioned artifact; a running container is an instance of that artifact. Containers share a kernel rather than running a full guest operating system by default, so they are not interchangeable with virtual machines or a complete security boundary. […]

Docker has become one of the most in-demand skills in the modern IT industry, and the Docker Certified Associate certification is a direct reflection of that demand. As containerization continues to reshape how software is built and deployed, more professionals are looking for structured ways to validate their Docker skills. Practice assessments have always played […]

Docker Certified Associate (DCA) is an active credential offered by Mirantis Training in November 2026, according to its official storefront. It assesses practical container skills, including Docker images, engine operations, networking, security, orchestration and data persistence. The older ExamLabs article was written as an announcement for a particular training product. That historical promotion does not […]