Solving Node.js Connection Issues Caused by Multiple API Requests from Angular

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The Problem at Hand

Common Status Codes Explained

204 No Content: The server successfully processed the request, but is not returning any content. This can occur if the requested resource does not have any data to send back.

304 Not Modified: Though technically a successful response, this indicates that the requested resource has not changed since the last request, leading to potential confusion in data retrieval.

The Root Cause: Database Connection Limits

Understanding Database Connection Limits

Every database management system (DBMS) has a limit on the number of concurrent connections it can handle. If your application exceeds this limit, connections will fail, leading to a range of issues including timeouts and data fetching errors. Here’s a simplified overview of how connection handling works:

Connection Pooling: Databases often maintain a pool of connections that applications can use. Once the limit is reached, no new connections can be established until some are released back to the pool.

Request Management: Handling multiple API requests without managing the database connections can overwhelm the server, leading to dropped connections.

Steps to Resolve the Issue

Now that we have identified the problem, let’s explore some practical solutions to resolve data loading issues in your application:

1. Increase Database Connection Limits

The simplest solution is to adjust the maximum allowed connections in your database configuration. This can often be done in your database settings file or through administrative commands:

For MySQL, you might use:

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2. Implement Connection Pooling

sequelize: An ORM that simplifies and automates database interactions while managing pooling.

3. Optimize API Calls from Angular

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