Connection pooling in GraphQL - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is connection pooling in databases?

Connection pooling is a technique that keeps a set of database connections open and ready to use. This helps applications reuse connections instead of opening a new one every time, making things faster and more efficient.

beginner

Why is connection pooling important for applications?

It reduces the time and resources needed to connect to the database repeatedly. This improves the speed of the app and lowers the load on the database server.

intermediate

How does connection pooling improve resource management?

By limiting the number of open connections and reusing them, connection pooling prevents too many connections from overwhelming the database, saving memory and CPU.

intermediate

What happens if all connections in the pool are busy?

New requests wait until a connection is free or a timeout occurs. This helps control the load but can cause delays if the pool is too small.

beginner

Name two common settings you can configure in a connection pool.

You can set the maximum number of connections in the pool and the timeout duration for waiting for a free connection.

What is the main benefit of using connection pooling?

A Faster reuse of database connections

B Storing data permanently

C Encrypting database queries

D Creating new connections for every request

Connection pooling speeds up database access by reusing open connections instead of creating new ones each time.

If all connections in a pool are busy, what usually happens?

A New requests are rejected immediately

B The database shuts down

C The pool automatically creates unlimited new connections

D New requests wait for a free connection or timeout

Requests wait for a free connection or timeout to avoid overloading the database.

Which setting controls how many connections can be open at once in a pool?

A Query cache size

B Connection timeout

C Max pool size

D Encryption level

Max pool size limits the number of simultaneous open connections.

Connection pooling helps reduce which of the following?

A Data storage size

B Network latency by reusing connections

C Number of database tables

D User interface complexity

Reusing connections reduces the time spent opening new connections, lowering network latency.

True or False: Connection pooling creates a new database connection for every query.

A False

B Only for INSERT queries

C Only for SELECT queries

D True

False. Connection pooling reuses existing connections instead of creating new ones for every query.

Explain connection pooling and why it is useful in database applications.

Think about how opening a new connection every time can slow things down.

Describe what happens when all connections in a connection pool are busy and how this affects application performance.

Consider what happens if too many people want to use a limited number of seats.