Is Creating Multiple ClientContext Instances Efficient in CSOM for one Site Url?

Question

Is it efficient to create a new ClientContext for each site URL and for each query, such as getting site users, lists, groups, and group members from the Web object? These queries can return a very large number of items, and CSOM does not support paging when retrieving data from Web properties. Because of this, there is a risk of memory issues.

In this case, is creating multiple ClientContext objects a good approach? Also, how does ClientContext work internally, and how does it handle memory and performance?

Answer 1

Dear Dinesh

Thank you for reaching out to the Q&A Forum.

Based on my research, creating multiple ClientContext objects is generally not a good approach because each instance performs its own authentication and connection setup. Additionally, ClientContext caches every object it retrieves, which can lead to a ballooning memory footprint over time. This creates a trade-off between performance and memory usage when working with large datasets through CSOM.

A better approach is to reuse a single ClientContext when performing normal workloads on the same site. This avoids repeated authentication overhead and allows CSOM to batch multiple operations efficiently in a single ExecuteQuery call. Reusing the context improves performance for typical operations where the total number of loaded objects remains moderate.

You can either:

• Use one context and sequentially load and process data in smaller chunks (disposing of objects or clearing references as you go), or
• Instantiate fresh ClientContext objects for separate large portions of data, thereby releasing memory between portions.

Please note that this is based on my research, and I recommend sharing this discussion on developer-focused platforms such as GitHub or Microsoft Tech Community for broader insights.

Hope this information is helpful to you!

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Answer 2

Creating multiple ClientContext instances for each query can lead to inefficiencies in terms of performance and memory usage, especially when dealing with large datasets. Each ClientContext object represents a connection to a SharePoint site, and creating a new instance for every query can increase overhead and resource consumption.

Instead, it is generally more efficient to reuse a single ClientContext instance for multiple operations when querying the same site. This approach minimizes the overhead of establishing new connections and can help manage memory more effectively.

Internally, ClientContext uses a batching system where chunks of managed code are converted into XML and sent to the server in a single HTTP request. This means that if you group multiple queries into a single ExecuteQuery call, it can significantly improve performance by reducing the number of round trips to the server. However, keep in mind that CSOM does not support paging when retrieving data from Web properties, which can lead to memory issues if large amounts of data are retrieved at once.

In summary, while creating multiple ClientContext instances is technically possible, it is not the most efficient approach. Instead, consider reusing a single instance for multiple queries to optimize performance and memory usage.

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References:

• Get a quick overview of the SharePoint object model
• Complete basic operations using SharePoint client library code