db.getLastErrorObj()

Definition

db.getLastErrorObj(w, wtimeout, j)

Starting in MongoDB 5.0, db.getLastErrorObj() is deprecated. For more information and alternatives, see Deprecated Wire Protocol Opcodes.

The db.getLastErrorObj() can accept the following parameters:

Parameter	Type	Description
w	int or string	Optional. The write concern's w value.
wtimeout	int	Optional. The time limit in milliseconds.
j	boolean	If true, wait for the next journal commit before returning, rather than waiting for a full disk flush. If mongod does not have journaling enabled, this option has no effect. If this option is enabled for a write operation, mongod will wait no more than 1/3 of the current commitIntervalMs before writing data to the journal.

Behavior

The returned document provides error information on the previous write operation.

If the db.getLastErrorObj() method itself encounters an error, such as an incorrect write concern value, the db.getLastErrorObj() throws an exception.

The db.getLastErrorObj() is a shell wrapper around the getLastError command.

Example

The following example issues a db.getLastErrorObj() operation that verifies that the preceding write operation, issued over the same connection, has propagated to at least two members of the replica set.

db.getLastErrorObj(2)

If the last error object is a duplicate key error, the method returns a document similar to the following:

{
   "err" : "E11000 duplicate key error collection: test.foobar index: x_1 dup key: { x: 1.0 }",
   "ns" : "test.foobar",         // New in 4.4
   "index" : "x_1",              // New in 4.4
   "code" : 11000,
   "codeName" : "DuplicateKey",
   "n" : 0,
   "singleShard" : "m1.example.net:27017",
   "ok" : 1,
   "operationTime" : Timestamp(1584654273, 1),
   "$clusterTime" : {
      "clusterTime" : Timestamp(1584654274, 1),
      "signature" : {
         "hash" : BinData(0,"Z3L9FdEIYQ2MwLg6X/4sDWacqzM="),
         "keyId" : NumberLong("6806025526243754005")
      }
   }
}