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Memcached Set Operation in C# (Detailed Guide w/ Code Examples)

Use Case(s)

The 'set' operation in Memcached is often used when you need to store data that may be expensive to recreate, like the result of a database query or a complex calculation. This can improve application performance by reducing the load on your database or CPU.

Code Examples

The EnyimMemcached client library is commonly used for interacting with Memcached in C#. Here's an example of how to use the 'set' command using this library:

// Create a new MemcachedClient object. using MemcachedClient client = new MemcachedClient(); // Save some data to the cache. bool success = client.Set("my_key", "Hello, World!"); // Check if the operation was successful. if (success) { Console.WriteLine("Data stored successfully."); } else { Console.WriteLine("Failed to store data."); }

In this code, the Set method is used to store a string with the key "my_key". The Set method returns a boolean indicating whether the operation was successful.

Best Practices

  • When using set, always check the return value to ensure the operation was successful.
  • Be mindful of the size of data you want to store. Memcached has a limit of 1MB per item.
  • Use meaningful and unique keys for your data to avoid accidental overwrites.

Common Mistakes

  • Storing sensitive data: Memcached does not have built-in security features. Don't use it to store sensitive data such as passwords or personal user information.
  • Relying on Memcached for persistency: Memcached is a caching solution and should not be used as a primary data store. Data in Memcached can be evicted when it runs out of memory.


Q: How long will data stay in Memcached? A: By default, data in Memcached does not expire. However, you can set an expiration time when you store an item.

Q: Can I update an item in the cache? A: Yes, you can use the Set command to overwrite the value of an existing item.

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