In the realm of digital transformation and data management, MongoDB, a general-purpose, document-based, distributed database, has established itself as a prominent player. It is intrinsic for businesses navigating the sea of big data to have a MongoDB consultant who can adeptly guide them through the turbulent waters to the shore of success. However, the crux of the matter lies in choosing the right consultant who can holistically cater to your business needs. This decision can be abetted by posing a set of insightful questions to the potential MongoDB consultants, thereby facilitating a comprehensive evaluation.

The first question that deserves attention pertains to experience. How long have they been working with MongoDB? What kind of projects have they undertaken? Experience serves as a pragmatic teacher, imparting lessons that the theoretical knowledge gained from textbooks often fails to provide. Hence, a consultant with substantial experience will be able to tackle issues more proficiently and provide solutions more creatively.

In addition to experience, asking about their technical prowess and certifications is essential. Are they MongoDB certified? What other relevant certifications do they hold? It is a well-known fact that certifications not only validate the skills of a professional but also give them an edge over others. MongoDB offers a variety of certifications, each targeting different levels and aspects of MongoDB usage. Certification indicates a commitment to the field and a proven level of understanding that can be critical in complex projects.

Next, inquire about the consultant’s approach to data security. MongoDB, like any other database, can be a potential target for cyber threats and data breaches. A competent MongoDB consultant will prioritize data security and have a comprehensive strategy in place to prevent such instances.

Further, it is significant to ask about a consultant’s ability to scale. Will they be able to seamlessly handle a surge in data volume? MongoDB is designed to handle large amounts of data; however, the management and the optimization of such a system will depend largely on the professional at the helm.

The query performance is another area that demands scrutiny. How well versed are they in optimizing the performance of MongoDB? An adept MongoDB consultant will be proficient in techniques such as indexing, sharding, and replication to enhance the performance of MongoDB.

A question about their familiarity with MongoDB's ecosystem should be added to your list. Are they acquainted with MongoDB Atlas, MongoDB Stitch, MongoDB Charts, etc.? MongoDB’s ecosystem has several tools aimed at enhancing its functionality; a consultant who is well versed with these tools can add immense value to your business.

Lastly, it is prudent to discuss the consultant’s adaptability to change, especially in an ever-evolving field like technology. How well do they adapt to new MongoDB updates and changes? A MongoDB consultant who is flexible and can quickly adapt to the changing landscape of MongoDB will ensure your business stays ahead of the curve.

The discussion above is based on the premise that the consultant who passes these question-filters would be the right choice. However, bearing in mind the complexity of business and the unique nature of every enterprise’s needs, it would be wise to consider the individual needs of your business in parallel to these questions. It is crucial to remember that the quintessential MongoDB consultant does not merely exist in the abstract but is the one who fits best in your business scenario, thereby ensuring that your investment in MongoDB pays rich dividends.