Troubleshooting Common Azure Cosmos Db Problems

Here are some common issues you might encounter and steps to help resolve them:

1. Connection And Authentication Errors

Issue: Difficulty connecting to Azure Cosmos DB due to network problems or authentication errors.

Troubleshooting:

• Check your network connectivity and ensure that your firewall rules allow access to Cosmos DB.
• Verify that your authentication credentials, such as the endpoint and access key or resource token, are correct.
• If using Azure AD authentication, make sure it is correctly configured and permissions are granted.

2. High Request Unit (RU) Consumption

Issue: Unexpectedly high RU consumption, leading to increased costs.

Troubleshooting:

• Use the Query Explorer in the Azure Portal or diagnostic logs to identify and optimize inefficient queries.
• Implement correct indexing for frequently used queries.
• Consider enabling and reviewing the Query Metrics in the Azure Portal for insights into query performance.

3. Query Timeout Errors

Issue: Queries timing out or taking too long to execute.

Troubleshooting:

• Optimize queries that frequently time out by indexing, using the right partition key, or increasing RU limits.
• Adjust the client application’s timeout settings to allow for longer query execution times if necessary.

4. Resource Exhaustion

Issue: Running out of resources such as throughput, CPU, or memory.

Troubleshooting:

• Monitor resource utilization, including CPU and memory, using Azure Monitor and scale your Cosmos DB container or throughput provision as needed.
• Consider using autoscale to automatically adjust resources based on demand.

5. Resource Exhaustion

Issue: Running out of resources such as throughput, CPU, or memory.

Troubleshooting:

• Monitor resource utilization, including CPU and memory, and scale your Cosmos DB container or throughput provision as needed.
• Consider using autoscale to automatically adjust resources based on demand.

6. Client-Side Errors and Exceptions

Issue: Client applications encountering errors or exceptions when interacting with Cosmos DB.

Troubleshooting:

• Implement proper error handling mechanisms in your JavaScript application, including try-catch blocks or promises.
• Review and address error messages and codes provided by the SDK for specific issues.
• Enable diagnostic logging and monitor logs for any unusual behavior or error messages.

When troubleshooting Cosmos DB issues, it’s important to gather as much information as possible, including error messages, logs, and performance metrics. Azure’s monitoring and diagnostic tools can be invaluable for identifying and resolving problems quickly.

Azure Cosmos DB is a No SQL database service that supports flexible schemas and hierarchical data for modern applications. It is a globally distributed, multi-model database service that supports document, key-value, wide-column, and graph databases. Azure Cosmos DB service takes care of database administration, updates, patching, and scaling. It also provides cost-effective serverless and automatic scaling options that match capacity with demand. Cosmos DB integrates with other Azure services and tools, such as Azure Functions, IoT Hub, AKS (Azure Kubernetes Service), App Service, and more. The Azure SDK for JavaScript is a collection of libraries that you can use to interact with various Azure services from your JavaScript applications. It supports both Node.js and browser environments.

In this article, we will learn about working with ‘Azure Cosmos DB and the JavaScript SDK’. CRUD operations and other common operations on Azure Cosmos DB resources can be done using the JavaScript SDK. The Cosmos DB JavaScript SDK is primarily meant for use in Node.js applications.

To work with Azure Cosmos DB, the user needs to create the Cosmos DB by configuring it from the Azure Portal. If you already have an Azure Cosmos DB you can use it by following the steps after the ‘creation of Azure Cosmos DB’. As a prerequisite, users need to have an Azure subscription.