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- $hint
$hint¶
-
$hint
¶ The
$hint
operator forces the query optimizer to use a specific index to fulfill the query. Specify the index either by the index name or by document.Use
$hint
for testing query performance and indexing strategies. Themongo
shell provides a helper methodhint()
for the$hint
operator.Consider the following operation:
This operation returns all documents in the collection named
users
using the index on theage
field.You can also specify a hint using either of the following forms: