Explanation: MongoDB preserves the order of the document fields following write operations. 7. The ______ field is always the first field in the document.
A. _id
B. id
C. Ob_id
D. None of the mentioned
Answer:A
Explanation: MongoDB preserves the order of the document fields following write operations. 7. The ______ field is always the first field in the document.
A. _id B. id C. Ob_id D. None of the mentioned
Explanation:Updates that include renaming of field names may result in the reordering of fields in the document. 8. To ensure functioning replication, do not store values that are of the _______ regular expression type in the _id field.