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Point out the wrong statement.

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Point out the wrong statement.

(a) The storage.wiredTiger.indexConfig.prefixCompression setting does not affect all indexes created

(b) Database profiling can impact database performance

(c) The default storage.wiredTiger.engineConfig.cacheSizeGB setting assumes that there is a single mongod instance per node

(d) None of the mentioned

I have been asked this question in exam.

Question is taken from Optimization Strategies topic in chapter Monitoring MongoDB and Optimization Strategies for MongoDB of MongoDB

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Right choice is (a) The storage.wiredTiger.indexConfig.prefixCompression setting does not affect all indexes created

The explanation is: If you change the value of storage.wiredTiger.indexConfig.prefixCompression on an existing MongoDB deployment, all new indexes will use prefix compression.

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