Explanation:In version 2.2 and newer, capped collections do have an _id field, except those in the local database. 2. Point out the wrong statement :
A. You can create indexes on fields within embedded documents
B. Indexes on embedded fields is similar to indexes on embedded documents
C. Indexes on embedded fields allow you to use a “dot notation,” to introspect into embedded documents
D. None of the mentioned
Answer:A
Explanation:In version 2.2 and newer, capped collections do have an _id field, except those in the local database. 2. Point out the wrong statement :
A. You can create indexes on fields within embedded documents B. Indexes on embedded fields is similar to indexes on embedded documents C. Indexes on embedded fields allow you to use a “dot notation,” to introspect into embedded documents D. None of the mentioned
Explanation: Indexes on embedded fields differ from indexes on embedded documents, which include the full content up to the maximum index size of the embedded document in the index. 3. For a _____ multikey index, each indexed document can have at most one indexed field whose value is an array.