By default, db.collection.explain() runs in queryPlanner verbosity mode. MongoDB runs the query optimizer to choose the winning plan for the operation under evaluation. db.collection.explain() returns the queryPlanner information for the evaluated method. Explain and Write Operations For write opera...
Starting in MongoDB 5.1, the number of times a stage was closed during query execution. explain.executionStats.executionStages.works Specifies the number of "work units" performed by the query execution stage. Query execution divides its work into small units. A "work unit" might consist of exa...
We need layers in the network model because each layer focuses on its own responsibilities. Each layer can rely on the headers for processing instructions and does not need to know the meaning of the data from the last layer. Why is Nginx called a “reverse” proxy? The diagram below shows...
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MongoDB runs thequery optimizerto choose the winning plan for the operation under evaluation.cursor.explain()returns thequeryPlannerinformation for the evaluatedmethod. executionStatsMode MongoDB runs thequery optimizerto choose the winning plan, executes the winning plan to completion, and returns statis...
Thedb.collection.find().explain()returns a cursor, which requires a call to.next(), or its alias.finish(), to return theexplain()results. If run interactively inmongosh,mongoshautomatically calls.finish()to return the results. For scripts, however, you must explicitly call.next(), or.fin...
Each of them has its own patterns of standardizing data exchange. You can check out the use cases of each style in the diagram. Code First vs. API First The diagram below shows the differences between code-first development and API-first development. Why do we want to consider API first ...
MongoDB runs the query optimizer to choose the winning plan for the operation under evaluation. db.collection.explain() returns the queryPlanner information for the evaluated method. Explain and Write Operations For write operations, db.collection.explain() returns information about the write operatio...
Thedb.collection.find().explain()returns a cursor, which requires a call to.next(), or its alias.finish(), to return theexplain()results. If run interactively inmongosh,mongoshautomatically calls.finish()to return the results. For scripts, however, you must explicitly call.next(), or.fin...
Using explain ignores all existing plan cache entries and prevents the MongoDB query planner from creating a new plan cache entry. Verbosity Modes The behavior of db.collection.explain() and the amount of information returned depend on the verbosity mode. Explain and Write Operations For write...