MongoDB - 索引 （二）使用

索引相关操作

Name	Description
db.collection.createIndex()	Builds an index on a collection. Use db.collection.ensureIndex().
db.collection.dropIndex()	Removes a specified index on a collection.
db.collection.dropIndexes()	Removes all indexes on a collection.
db.collection.ensureIndex()	Creates an index if it does not currently exist. If the index existsensureIndex() does nothing.
db.collection.getIndexes()	Returns an array of documents that describe the existing indexes on a collection.
db.collection.getIndexStats()	Renders a human-readable view of the data collected by indexStats which reflects B-tree utilization.
db.collection.indexStats()	Renders a human-readable view of the data collected by indexStats which reflects B-tree utilization.
db.collection.reIndex()	Rebuilds all existing indexes on a collection.
db.collection.totalIndexSize()	Reports the total size used by the indexes on a collection. Provides a wrapper around the totalIndexSize field of the collStats output.
cursor.explain()	Reports on the query execution plan, including index use, for a cursor.
cursor.hint()	Forces MongoDB to use a specific index for a query.
cursor.max()	Specifies an exclusive upper index bound for a cursor. For use withcursor.hint()
cursor.min()	Specifies an inclusive lower index bound for a cursor. For use withcursor.hint()
cursor.snapshot()	Forces the cursor to use the index on the _id field. Ensures that the cursor returns each document, with regards to the value of the _id field, only once.

Name	Description
dropIndexes	Removes indexes from a collection.
compact	Defragments a collection and rebuilds the indexes.
reIndex	Rebuilds all indexes on a collection.
validate	Internal command that scans for a collection’s data and indexes for correctness.
indexStats	Experimental command that collects and aggregates statistics on all indexes.
geoNear	Performs a geospatial query that returns the documents closest to a given point.
geoSearch	Performs a geospatial query that uses MongoDB’s haystack index functionality.
geoWalk	An internal command to support geospatial queries.
checkShardingIndex	Internal command that validates index on shard key.

Geospatial Query Selectors

Name	Description
$geoWithin	Selects geometries within a bounding GeoJSON geometry.
$geoIntersects	Selects geometries that intersect with a GeoJSON geometry.
$near	Returns geospatial objects in proximity to a point.
$nearSphere	Returns geospatial objects in proximity to a point on a sphere.

Indexing Query Modifiers

Name	Description
$explain	Forces MongoDB to report on query execution plans. See explain().
$hint	Forces MongoDB to use a specific index. See hint()
$max	Specifies an exclusive upper limit for the index to use in a query. Seemax().
$min	Specifies an inclusive lower limit for the index to use in a query. See min().
$returnKey	Forces the cursor to only return fields included in the index.
$snapshot	Forces the query to use the index on the _id field. See snapshot().

后台建立索引 db.people.ensureIndex( { zipcode: 1}, {background: true} ) 

索引相关命令：http://docs.mongodb.org/manual/reference/indexes/