MongoDB Exam C100DBA Topic 1 Question 81 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 81
Topic #: 1

Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.

AshenableShardingtestdbshshardCollectiontestdbtestCollectionidtrue

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Suggested Answer: A

by Karl at Feb 08, 2024, 11:28 PM

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Crista

1 years ago

Great, I feel more confident now about setting up sharding on this database

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Leonida

1 years ago

That makes sense, because we need to specify the collection name within the 'shardCollection' command

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Lawanda

1 years ago

I think the correct command is sh.enableSharding("testdb") followed by sh.shardCollection("testdb.testCollection", {"_id": 1})

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Crista

1 years ago

But don't we also need to enable sharding on the 'testCollection' collection with '_id' as the shard key?

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Leonida

1 years ago

No, I believe it should be sh.enableSharding("testdb")

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Crista

1 years ago

I think the correct command is sh.shardCollection("testdb", "testCollection", {"_id": "hashed"})

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Lashon

1 years ago

That makes sense. Enabling sharding on 'testdb' and sharding 'testCollection' with '_id' as shard key will help distribute data efficiently.

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Burma

1 years ago

Yes, I agree with Celestine. And to shard a collection with '_id' as shard key, the command should be 'sh.shardCollection('testdb.testCollection', {_id: 1})'.

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Celestine

1 years ago

I think the correct command to enable sharding on a database 'testdb' is 'sh.enableSharding('testdb')'.

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