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MongoDB Manual

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New in version 2.6.

MongoDB can use the intersection of multiple indexes to fulfill queries. [1] In general, each index intersection involves two indexes; however, MongoDB can employ multiple/nested index intersections to resolve a query.

To illustrate index intersection, consider a collection orders that has the following indexes:

copied

MongoDB can use the intersection of the two indexes to support the following query:

copied

To determine if MongoDB used index intersection, run explain() ; the results of explain() will include either an AND_SORTED stage or an AND_HASH stage.

With index intersection, MongoDB can use an intersection of either the entire index or the index prefix. An index prefix is a subset of a compound index, consisting of one or more keys starting from the beginning of the index.

Consider a collection orders with the following indexes:

copied

To fulfill the following query which specifies a condition on both the qty field and the status field, MongoDB can use the intersection of the two indexes:

copied

Index intersection does not eliminate the need for creating compound indexes . However, because both the list order (i.e. the order in which the keys are listed in the index) and the sort order (i.e. ascending or descending), matter in compound indexes , a compound index may not support a query condition that does not include the index prefix keys or that specifies a different sort order.

For example, if a collection orders has the following compound index, with the status field listed before the ord_date field:

copied

The compound index can support the following queries:

copied

But not the following two queries:

copied

However, if the collection has two separate indexes:

copied

The two indexes can, either individually or through index intersection, support all four aforementioned queries.

The choice between creating compound indexes that support your queries or relying on index intersection depends on the specifics of your system.

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