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Write Concern In MongoDB

Purpose

Syntax

db.[Table_name].insertOne(
{
   [inserted_document]
}, 
   {
      writeConcern:
      {
         w:[value], 
         j=[true/false], 
        wtimeout=[timeout value]
     }
})

1. w → request acknowledgment that the write operation has propagated to a specified number of MongoDB instances
2. j → request acknowledgment that the write operation has been written to the on-disk journal
3. wtimeout → specify a time limit to prevent write operations from blocking indefinitely

Example