MongoDB Administrator's Guide

How to do it...

1. First, we connect to the primary replica set node and insert about 100,000 random documents:

for(var x=0; x<100000; x++){ db.mycol.insert({age:(Math.round(Math.random()*100)%20) }) }

2. Immediately switch to a different Terminal and take the backup:

mongodump --oplog --out /backups/dump/

3. You should see an output similar to this:

2017-10-04T15:02:53.921+0000 writing admin.system.version2017-10-04T15:02:53.928+0000 done dumping admin.system.version (1 document)2017-10-04T15:02:53.929+0000 writing mydb.mockdata2017-10-04T15:02:53.934+0000 writing mydb.mycol2017-10-04T15:02:53.986+0000 done dumping mydb.mycol (5922 documents)2017-10-04T15:02:54.662+0000 done dumping mydb.mockdata (100000 documents)2017-10-04T15:02:54.667+0000 ...