mongodb spring boot index usage 0

  1. Define a MongoDB entity class annotated with @Document representing the data model.
@Document(collection = "your_collection_name")
public class YourEntity {
    // Fields and annotations for mapping properties to MongoDB fields
  1. Annotate relevant fields with @Indexed to specify index creation.
@Indexed(unique = true)
private String indexedField;
  1. Create a Spring Data MongoDB repository interface for the entity.
public interface YourEntityRepository extends MongoRepository<YourEntity, String> {
    // Custom query methods if needed
  1. Ensure MongoDB connection settings in or application.yml.
  1. Enable MongoDB repositories in the main application class.
@EnableMongoRepositories(basePackages = "your.package.repository")
public class YourApplication {
    public static void main(String[] args) {, args);
  1. Verify index usage by enabling MongoDB profiling.
  1. Analyze MongoDB logs or use tools like MongoDB Compass to inspect query execution and index usage.

  2. Optionally, use explain() method in queries to get information about query execution.

Query query = new Query(Criteria.where("field").is(value));
YourEntity result = mongoTemplate.findOne(query, YourEntity.class);
Document explanation = mongoTemplate.getCollection("your_collection_name").explain().findOne();