db.getCollection('mdtest').insertMany(
[{item:"Record a", "createdAt": new Date()}, {item:"Record b", "createdAt": new Date()}, {item:"Record c", "deleteable": 1, "createdAt": new Date()}, {item:"Record D", "createdAt": new Date()}, {item:"Record e", "createdAt": new Date()}, {item:"Record f", "createdAt": new Date() }]
)





```json
/* 1 */
{
    "_id" : ObjectId("5ae05eda5a560b44ecfed75e"),
    "item" : "Record a",
    "createdAt" : ISODate("2018-04-25T10:56:26.833Z")
}

/* 2 */
{
    "_id" : ObjectId("5ae05eda5a560b44ecfed75f"),
    "item" : "Record b",
    "createdAt" : ISODate("2018-04-25T10:56:26.833Z")
}

/* 3 */
{
    "_id" : ObjectId("5ae05eda5a560b44ecfed760"),
    "item" : "Record c",
    "deleteable" : 1.0,
    "createdAt" : ISODate("2018-04-25T10:56:26.833Z")
}

/* 4 */
{
    "_id" : ObjectId("5ae05eda5a560b44ecfed761"),
    "item" : "Record D",
    "createdAt" : ISODate("2018-04-25T10:56:26.833Z")
}

/* 5 */
{
    "_id" : ObjectId("5ae05eda5a560b44ecfed762"),
    "item" : "Record e",
    "createdAt" : ISODate("2018-04-25T10:56:26.833Z")
}

/* 6 */
{
    "_id" : ObjectId("5ae05eda5a560b44ecfed763"),
    "item" : "Record f",
    "createdAt" : ISODate("2018-04-25T10:56:26.833Z")
}

```

db.getCollection('mdtest').createIndex( { "createdAt": 1 }, { expireAfterSeconds: 180, background:true } )

TTL set for 3 minutes



quickDelete: 2m
longDelete: 10m