mongosh provides several additional cursor flags to
modify the behavior of the cursor.
Sets the cursor not to close once the last data is received, allowing the query to continue returning data added after the initial results were exhausted.
Allows querying of a replica secondary.
Prevents the server from timing out idle cursors.
For use with
Sets the cursor to block the query thread when no data is
available and await data for a set time instead of immediately
returning no data. The cursor returns no data only if the
Sets the cursor to return all data returned by the query at once rather than splitting the results into batches.
Sets the cursor to return partial data from a query against a sharded cluster in which some shards do not respond rather than throwing an error.
The following example adds the
DBQuery.Option.tailable flag and the
DBQuery.Option.awaitData flag to ensure that the query returns a
tailable cursor. The sequence
creates a cursor. After returning the full result set, it waits for the
default interval of 1000 milliseconds so that it can capture
and return additional data added during the query:
var t = db.myCappedCollection; var cursor = t.find().addOption(DBQuery.Option.tailable). addOption(DBQuery.Option.awaitData)
Adding incorrect wire protocol flags can cause problems and/or extra server load.