MongoDB
C100DBA · Question #36
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?
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Performance Tuning
Question
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?
Exhibit
Options
- Adb.posts.createIndex({commerits.$.author":-l});
- Bdb.posts.createIndex({comments.$.author": {$desc:l>});
- Cdb.posts.createIndex({comments.author":-l});
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Topics
#index creation#array index#nested documents#descending index