QUESTION: 65

The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:

<replicasetid>.oplog.rs
oplog.rs
<database>..oplog.rs
local.oplog.rs

Answer(s): D

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QUESTION: 66

In a collection that contains 100 post documents, what does the following command do? db. posts. find().skip(5).limit(5)

Skip and limit nullify each other. Hence returning the first five documents
Limits the first five documents and then return them in reverse order
Skips the first five documents and returns the sixth document five times
Skips the first five documents and returns the next five

Answer(s): D

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QUESTION: 67

In a sharded replicas set environment with multiple mongos servers, which of the following would decide the mongos failover?

mongos
mongo shell
individual language drivers
mongod

Answer(s): C

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QUESTION: 68

In what format does mongodump creates backup files?

BSON
JSON
SOAP
XML

Answer(s): A

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QUESTION: 68