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- db.collection.ensureIndex()
db.collection.ensureIndex()¶
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Definition¶
- db.collection.ensureIndex(keys, options)¶
3.0.0 版后已移除: db.collection.ensureIndex() is now an alias for db.collection.createIndex().
Creates an index on the specified field if the index does not already exist.
Additional Information¶
- Use db.collection.createIndex() rather than db.collection.ensureIndex() to create new indexes.
- The Indexes section of this manual for full documentation of indexes and indexing in MongoDB.
- db.collection.getIndexes() to view the specifications of existing indexes for a collection.