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EXPRESS

Short Description

Stages for a limited set of queries that can bypass regular query planning to use optimized index scan plans

Detailed Description​

In MongoDB explain plans, EXPRESS refers to a group of internal execution stages introduced in MongoDB 8.0. These stages are used for a limited set of queries that can bypass the regular query planner and use highly optimized index scan plans.

In simple terms:

When you see an EXPRESS stage (such as EXPRESS_IXSCAN or EXPRESS_DELETE), MongoDB was able to quickly recognize and run your query using a shortcut plan, making it faster and more efficient.

Examples of EXPRESS stages:

  • EXPRESS_IXSCAN: Optimized index scan
  • EXPRESS_CLUSTERED_IXSCAN: Optimized clustered index scan
  • EXPRESS_DELETE: Optimized delete operation
  • EXPRESS_UPDATE: Optimized update operation

These stages mean MongoDB took a fast path to execute your query, skipping some of the usual planning steps.

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