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| Section | Weight | Objectives |
|---|---|---|
| Sharding and Scalability | 10% | - Query routing and cluster operations - Shard keys, chunk management, balancing - Sharded cluster architecture |
| Backup, Recovery and Maintenance | 10% | - Data consistency and integrity checks - Restore procedures and disaster recovery - Logical and physical backup methods |
| CRUD Operations and Indexing | 20% | - Query optimization and aggregation - Create, Read, Update, Delete operations - Index types, creation, and management |
| Replication and High Availability | 15% | - Failover, elections, read/write concern - Deployment and maintenance of replica sets - Replica set architecture and components |
| MongoDB Architecture and Deployment | 20% | - Core concepts, JSON/BSON, data model - Installation and configuration - Storage engines and server management |
| Monitoring, Performance and Troubleshooting | 10% | - Monitoring tools and metrics - Diagnostics and resolving common issues - Performance tuning and optimization |
| Security and Access Control | 15% | - Authentication mechanisms - Role-based access control - Encryption, auditing, and security best practices |
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NEW QUESTION # 160
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: B
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 # 161
Write the command(s) are correct to enable sharding on a database " testdb " and shard a collection " testCollection " with _id as shard key.
Answer:
Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )
NEW QUESTION # 162
Which command can be used to rebuild the indexes on a collection in MongoDB?
Answer: A
NEW QUESTION # 163
To add a new user and enable authentication in MongoDB, which of the following steps need be executed?
Answer: D
NEW QUESTION # 164
What is the maximum size of a MongoDB document
Answer: A
NEW QUESTION # 165
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