Garbage collection with git gc - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What does git gc do?

Which of the following best describes the purpose of the git gc command?

A It clones a remote repository to your local machine.

B It deletes all branches except the current one.

C It resets the repository to the last commit, discarding all changes.

D It cleans up unnecessary files and optimizes the local repository by compressing objects.

💡 Hint

Think about how Git manages storage and what cleanup might mean.

The git gc command stands for garbage collection. It removes unnecessary files and compresses objects to optimize the repository's storage.

❓ query_result

intermediate

Output of git gc --dry-run

What is the expected output when running git gc --dry-run in a repository?

A Shows the current branch name only.

B Deletes all untracked files immediately.

C Lists the files and objects that would be cleaned or compressed without making changes.

D Displays an error saying the command is invalid.

💡 Hint

The --dry-run option usually means no changes are made.

The --dry-run option simulates the garbage collection process and lists what would be done without changing anything.

📝 Syntax

advanced

Identify the correct git gc command to aggressively optimize

Which command runs git gc with aggressive optimization to compress objects more thoroughly?

A git gc --aggressive

B git gc --force-aggressive

C git gc --deep-clean

D git gc --compress-all

💡 Hint

Look for the official flag that increases compression effort.

The --aggressive flag tells git gc to spend more time compressing objects for better optimization.

🔧 Debug

advanced

Why does git gc fail with 'unable to create temporary file' error?

You run git gc and get the error: unable to create temporary file. What is the most likely cause?

A The disk is full or the user lacks write permissions in the repository directory.

B The repository has no commits yet.

C The remote repository is unreachable.

D The current branch is not checked out.

💡 Hint

Temporary files need space and permission to be created.

This error usually means Git cannot write temporary files because the disk is full or permissions are missing.

❓ optimization

expert

How to automate git gc for large repositories?

For a large repository with many objects, which approach best automates running git gc without impacting developer workflow?

A Run <code>git gc --aggressive</code> manually every time a commit is made.

B Schedule <code>git gc --auto</code> to run periodically in the background during low activity times.

C Disable garbage collection entirely to avoid any delays.

D Run <code>git gc</code> only after pushing to the remote repository.

💡 Hint

Think about balancing optimization and developer experience.

Using git gc --auto scheduled during low activity times automates cleanup without slowing down developers.