- Reference >
- MongoDB\Collection Class >
- MongoDB\Collection::estimatedDocumentCount()
MongoDB\Collection::estimatedDocumentCount()
New in version 1.4.
On this page
Definition
-
MongoDB\Collection::estimatedDocumentCount
Gets an estimated number of documents in the collection using collection metadata.
This method has the following parameters:
Parameter Type Description $options
array Optional. An array specifying the desired options. The
$options
parameter supports the following options:Option Type Description maxTimeMS
integer Optional. The cumulative time limit in milliseconds for processing operations on the cursor. MongoDB aborts the operation at the earliest following interrupt point. readConcern
MongoDB\Driver\ReadConcern Optional. Read concern to use for the operation. Defaults to the collection’s read concern.
This is not supported for server versions prior to 3.2 and will result in an exception at execution time if used.
It is not possible to specify a read concern for individual operations as part of a transaction. Instead, set the
readConcern
option when starting the transaction with startTransaction.readPreference
MongoDB\Driver\ReadPreference Optional. Read preference to use for the operation. Defaults to the collection’s read preference. session
MongoDB\Driver\Session Optional. Client session to associate with the operation.
Sessions are not supported for server versions prior to 3.6.
Return Values
An estimated number of documents in the collection.
Errors/Exceptions
MongoDB\Exception\UnexpectedValueException
if the command
response from the server was malformed.
MongoDB\Exception\UnsupportedException
if options are used and
not supported by the selected server (e.g. collation
, readConcern
,
writeConcern
).
MongoDB\Exception\InvalidArgumentException
for errors related to
the parsing of parameters or options.
MongoDB\Driver\Exception\RuntimeException for other errors at the driver level (e.g. connection errors).
Behavior
This method returns an estimate of the count of documents in the collection
using collection metadata, rather than counting the documents or consulting an
index. This method does not take a session
option and cannot be executed
within a transaction.
See Also
- count command reference in the MongoDB manual
MongoDB\Collection::countDocuments()