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| Section | Objectives |
|---|---|
| Topic 1: Aggregation Framework | - Data transformation and grouping - Aggregation pipeline stages - Aggregation operators |
| Topic 2: Sharding and Scalability | - Balancing and scaling operations - Sharded cluster architecture - Shard keys and distribution strategy |
| Topic 3: MongoDB CRUD Operations | - Working with documents and BSON types - Querying and filtering documents - Insert, update, and delete operations |
| Topic 4: Backup, Restore, and Operations | - Backup strategies and tools - Restore procedures - Monitoring and maintenance |
| Topic 5: Data Modeling | - Schema design principles - Relationships in MongoDB - Embedding vs referencing |
| Topic 6: Indexing and Performance Tuning | - Query performance optimization - Explain plans and diagnostics - Index types and usage |
| Topic 7: Replication and High Availability | - Read/write concerns - Failover and elections - Replica set architecture |
| Topic 8: Security | - Authentication and authorization - Encryption at rest and in transit - Role-based access control (RBAC) |
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NEW QUESTION # 48
What does the totalCreated field mean in the output of the db.serverStatus().connections command?
> db.serverStatus().connections
{
" current " : 4,
" available " : 51196,
" totalCreated " : 5,
" active " : 2,
" threaded " : 4,
" exhaustIsMaster " : 1,
" exhaustHello " : 0,
" awaitingTopologyChanges " : 1
}
Answer: D
Explanation:
connections.totalCreated is a cumulative count of incoming connections created during the lifetime of the running MongoDB server process. It includes connections that are still open as well as connections that have already closed. That is why the example can show totalCreated: 5 while current: 4: five connections have been created since the process started, but only four remain current. Option A is incorrect because the counter is not limited to closed connections. Option C corresponds more closely to connections.current, which reports presently existing incoming client connections. Option B is imprecise because "since the server was set up" could imply the lifetime of the installation or deployment across restarts, whereas server-status counters generally reflect the current process lifetime. Tracking totalCreated alongside current, active, and connection- pool behavior helps administrators identify excessive connection churn, poorly configured client pools, or bursts of new connections. The most accurate interpretation among the choices is therefore the number of connections created since the server process was started, making D correct.
Study Guide reference/topic:Performance Monitoring and Tuning - serverStatus, connection metrics, and cumulative connection counters.
NEW QUESTION # 49
Consider the following example document:
{
"_id": Objectld("5360c0a0a655a60674680bbe"),
"user"
"login": "irOn"
"description": "Made of steel"
"date": ISODate("2014-04-30T09:16:45.836Z"),
}
>
and 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.
Answer: D
NEW QUESTION # 50
Which mongodb tools allow us to work with our data in a human readable format?
Answer: C,D
NEW QUESTION # 51
What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden. The set also has an arbiter?
Answer: C
NEW QUESTION # 52
Consider the following document from the products collection:
What does the following query using $elemMatch return? db.products.find( { product_code: "345678" }, { variations: { $elemMatch: { size:
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