Your company is planning a major system upgrade, including migrating large volumes of data to a new platform. How would you minimize downtime and ensure data integrity during the migration process?
- Conduct the migration during off-peak hours with minimal user activity
- Implement a rollback plan in case of unexpected issues
- Perform thorough testing in a staging environment before the actual migration
- Utilize incremental migration to minimize the impact on operations
To minimize downtime and ensure data integrity during a system migration, it is crucial to perform thorough testing in a staging environment before the actual migration. This helps identify and address potential issues, ensuring a smooth transition to the new platform.
What is indexing in the context of database design?
- A method to increase data redundancy
- A process to create complex queries
- A technique to optimize the retrieval of records from a database table
- A way to define primary keys
Indexing in database design is a technique used to optimize the retrieval of records from a database table. It involves creating an index on one or more columns to speed up the data retrieval process.
You have a large document with multiple sections. Which HTML5 element would you use to define each section independently for better structure and semantics?
-
The
element in HTML5 is used to define a section in a document. It is appropriate for grouping together content that is thematically related or independent for better structure and semantics.
What is a composite key in Cassandra?
- A key formed by combining multiple columns
- A key formed by hashing
- Foreign key linking two tables
- Primary key of a table
In Cassandra, a composite key is formed by combining multiple columns. This key allows for more complex and flexible data modeling by including multiple attributes in the primary key.
Describe the difference between composition and inheritance in OOP.
- Composition allows creating complex objects by combining simpler ones, while inheritance allows a class to inherit properties and behavior from another class.
- Composition and inheritance are two terms that mean the same thing in OOP.
- Composition is not used in Object-Oriented Programming.
- Composition is used for creating new objects, while inheritance is used for modifying existing objects.
Composition and inheritance are both mechanisms for reusing code in OOP, but they differ in their approach. Composition involves creating complex objects by combining simpler ones, whereas inheritance involves creating a new class based on an existing class, inheriting its properties and behavior.
What command is used to stage files for committing in Git?
- git add
- git commit
- git push
- git stage
The command used to stage files for committing in Git is git add. This command adds changes to the staging area, preparing them for the next commit. It allows for selective committing of changes.
What does SDLC stand for?
- Software Development Life Cycle
- Structured Design and Life Cycle
- System Design and Life Cycle
- Systematic Development Life Cycle
SDLC stands for Software Development Life Cycle. It is a systematic process for planning, creating, testing, deploying, and maintaining information systems.
Which AWS service is used for serverless computing?
- AWS Lambda
- Amazon EC2
- Amazon RDS
- Amazon S3
AWS Lambda is the AWS service used for serverless computing. It allows developers to run code without provisioning or managing servers. It's a cost-effective way to build applications that respond to events and scale automatically.
In GitHub Flow, when is a pull request typically merged into the main branch?
- After passing code review and approval
- As soon as the pull request is created
- Before any testing is done
- Only after the feature is fully implemented
In GitHub Flow, a pull request is typically merged into the main branch after it has undergone code review, received approvals, and any required tests have passed. This ensures the quality and integrity of the main branch.
Your team has encountered a critical issue in the production environment after deploying the software. Outline the steps you would take to address this issue and prevent similar incidents in the future.
- Conduct Root Cause Analysis
- Identify and Isolate the Issue
- Implement Automated Testing
- Rollback to the Previous Version
In response to a critical production issue, the key step is to conduct a root cause analysis. This involves identifying the underlying cause of the problem to implement a targeted solution. Rolling back may be necessary, but preventing future incidents requires understanding and addressing the root cause.