What is the purpose of "git cherry-pick"?
- Applying a specific commit to another branch
- Creating a new branch from the latest commit
- Merging two branches with conflicting changes
- Reverting all changes in the working directory
The purpose of "git cherry-pick" is to apply a specific commit from one branch to another. It allows developers to select and incorporate individual commits into a different branch, facilitating the selective integration of changes.
In monitoring systems, _______ metrics provide insights into the health and performance of individual system components.
- Component-level
- Infrastructure
- Performance
- System-wide
In monitoring systems, component-level metrics provide insights into the health and performance of individual system components. These metrics help identify bottlenecks or issues at the granular level, aiding in efficient troubleshooting and optimization.
You accidentally delete a file in your Git repository. What command would you use to restore the file from a previous commit?
- git checkout
-- file-path - git reset --hard HEAD~1
- git restore --source=
--staged --worktree file-path - git revert
The correct command is git restore --source= --staged --worktree file-path where you restore the file from a specific commit using the restore command.
Explain the concept of cache coherency in distributed caching systems.
- Ensures that all nodes in the system have consistent data
- Maximizes cache size in a single node
- Minimizes the use of caching in distributed systems
- Prioritizes caching in specific nodes
Cache coherency in distributed systems ensures that all nodes have consistent data by synchronizing their caches. It prevents data inconsistencies across the network.
How does Git mark merge conflicts in the affected files?
- Adding a "Conflict" label to conflicted lines
- Appending "-conflict" to file names
- Creating a separate conflicted branch
- Using special conflict markers (<<<<<<<, =======, >>>>>>>)
Git marks merge conflicts in the affected files using special conflict markers like <<<<<<<, =======, and >>>>>>>. These markers indicate the conflicting sections that need manual resolution.
When resolving conflicts in Git, the modified files must be _______ before committing.
- Committed
- Merged
- Reverted
- Staged
When resolving conflicts in Git, the modified files must be staged (using "git add") after resolving the conflict but before committing the changes. Staging indicates that the conflicts have been addressed and are ready to be included in the next commit.
You're designing a high-traffic e-commerce website. What caching strategies would you implement to ensure optimal performance during peak times?
- Browser caching for static assets
- Content Delivery Network (CDN) caching
- Database caching
- In-memory caching with tools like Redis
In high-traffic e-commerce websites, in-memory caching with tools like Redis is crucial. It helps store frequently accessed data in memory, reducing the need to query the database repeatedly, and thus improving performance during peak times.
Which SQL keyword is used to retrieve data from a database?
- FETCH
- GET
- RETRIEVE
- SELECT
The SQL keyword used to retrieve data from a database is SELECT. It is the fundamental command to fetch data from one or more tables.
What is a Dockerfile used for in Docker containerization?
- Configuring network settings
- Defining the instructions to build a Docker image
- Managing multiple containers as a single application
- Storing runtime data of a container
A Dockerfile in Docker containerization is used to define the instructions needed to build a Docker image. It contains a set of commands that describe the base image, application code, dependencies, and configuration, allowing for consistent and reproducible image builds.
What are some strategies for handling asynchronous errors in Node.js?
- Caching, Authentication, Authorization, Rate Limiting
- Callbacks, Promises, Async/Await, Event Emitters
- Exception Handling, Error Codes, Logging, Retry Mechanism
- Polling, WebSockets, Threading, Buffers
Handling asynchronous errors in Node.js involves using strategies such as Callbacks, Promises, Async/Await, and Event Emitters. These mechanisms help in dealing with asynchronous code execution and managing errors effectively.