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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)
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Addding the index {a:l} can potentially decrease the speed of which of the following operations? Check all that apply.
Which of the following is a valid Replica Set configuration if you want: 1-Have 3 copies of everything 2- That RS3 is never primary 2- That RSI and RS2 can be primary? You had to see the different configurations, RS3 could be hidden or priority 0 (But not a referee because we need 3 replicas), while RSI and RS2 could NOT have priority 0 or be hidden or anything like that In a 4-member RS RSO , RSI, RS2 and RS3 + Referee, RSO (primary) falls after some write operations that have replicated RSI and RS2 (but NOT RS3), who can get up as the new primary? The configuration comes and in it we see that RS2 has a hidden: true (or a priority: 0, (I don't remember)
Consider the following example document: { "_id": Objectld("5360c0a0a655a60674680bbe"), "user" "login": "irOn" "description": "Made of steel" "date": ISODate("2014-04-30T09:16:45.836Z"), } >a nd index creation command: db.users.createlndex( { "user.login": 1, "user.date": -1 }, "mylndex" ) When performing the following query: db.users.find( { "user.login": /Air.*/ }, { "user":1, "_id":0 > ).sort( { "user.date":1 > ) which of the following statements correctly describe how MongoDB will handle the query? Check all that apply.
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply. db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )
Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?
Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});
You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?
You perform the following query on the sayings collection, which has the index { quote : "text" }: Assuming the documents below are in the collection, which ones will the following query return? Check all that apply. db.sayings.find( { $text : { $search : "fact find" } } )
You have the following index on the toys collection: { "manufacturer" : 1, "name" : 1, "date" : -1 } Which of the following is able to use the index for the query? Check all that apply.
Given a replica set with five data-bearing members, suppose the primary goes down with operations in its oplog that have been copied from the primary to only one secondary. Assuming no other problems occur, which of the following describes what is most likely to happen?