Explanation:The TTL index is a single field index. 2. Point out the correct statement :
A. Data expiration is useful for some classes of information, including machine generated event data, logs, and session information
B. A special TTL index property supports the implementation of TTL collections
C. TTL collections make it possible to store data in MongoDB and have the mongod automatically remove data after a specified number of seconds or at a specific clock time
D. All of the mentioned
Answer:A
Explanation:The TTL index is a single field index. 2. Point out the correct statement :
A. Data expiration is useful for some classes of information, including machine generated event data, logs, and session information B. A special TTL index property supports the implementation of TTL collections C. TTL collections make it possible to store data in MongoDB and have the mongod automatically remove data after a specified number of seconds or at a specific clock time D. All of the mentioned
Explanation: The TTL feature relies on a background thread in mongod that reads the date-typed values in the index and removes expired documents from the collection. 3. If the indexed field in a document is not a _____ or an array that holds a date value(s), the document will not expire.