This document discusses new features in MongoDB version 3.6 including $lookup for joins, retryable writes, change streams, and updates to arrays. It also covers MongoDB Atlas cloud database services and MongoDB Stitch for backend services. Demo sessions are listed for Atlas, Stitch, and using new MongoDB 3.6 features.

1. # M D B l o c a l
CTO & Co-
Founder
Eliot Horowitz
MongoDB @eliothorowitz
Eliot Horowitz

2. Business
Intelligence

3. 1 Picture > 1.0E3 Queries
12
10
8
6
4
124 6 6 10 14 16 18
Y1
X1
12
10
8
6
4
124 6 6 10 14 16 18
Y3
X3
12
10
8
6
4
124 6 6 10 14 16 18
Y2
X2
12
10
8
6
4
124 6 6 10 14 16 18
Y4 X4

4. BI Connector

5. Built with MongoDB

6. BI Connector 2.0

8. Polymorphic Documents
{
_id: 1,
name: "Hip T-shirt",
price: 45.0,
size: "M",
description: "The
perfect balance of obscure
and iconic."
}
{
_id: 2,
name: "USB Battery",
price: 15.0,
mAh: 6000,
description:
"Conferences are phone-
killers. Bring backup."
}

9. Arrays
orders:
{
...
line_items : [
{ title : “USB Battery”,
price: 15.0 },
{ title : “Hip T-shirt”,
price : 45.0 }
],
...
},
...
1: Most popular items
USB Battery : 5
T-shirt : 4
etc.
2: Histogram of order price
< $10 : 20%
$10 - $29 : 15%
$30 - $99 : 40%
> $100 : 5%

10. Built with MongoDB ChartsBuilt with MongoDB

11. MongoDB Charts: Dashboards

12. Grigori Melnik
Head of Product,
Server & Tools
Demo:
MongoDB Charts

13. MongoDB Charts
https://mongodb.social/Charts/Preview
Sign Up For

14. MongoDB Charts
Coming Soon

15. MongoDB Server
3.6

17. $lookup

18. $lookup in 3.6
orders:
{
...
line_items : [
{ id: 123,
title : “USB Battery”,
price: 15.0 },
{ id: 512,
title : “Hip T-shirt”,
price : 45.0 }
],
...
}

19. $lookup in 3.6
orders:
{
...
line_items : [
{ id: 123,
title : “USB Battery”,
price: 15.0 },
{ id: 512,
title : “Hip T-shirt”,
price : 45.0 }
],
...
}
db.orders.aggregate([
{$unwind : … },
{$lookup:{
from: "reviews",
let: {p_id:"$line_items.id"},
pipeline: [
{$match: {p_id:{$expr:"$$p_id"}}},
{$group: {
_id : 1,
rating:{$avg:“$rating}
} ],
as: ”avgRating” },
{ … }
])

20. Arrays
orders:
{
_id: 5,
line_items : [
{ id: 123,
title : “USB Battery”,
price: 15.0 },
{ id: 512,
title : “Hip T-shirt”,
price : 45.0 }
],
...
}

21. Updating Arrays: All Elements
db.orders.update(
{ _id: 5 },
{ $mul: {
"line_items.$[].price",
0.8
}
}
)
orders:
{
_id: 5,
line_items : [
{ id: 123,
title : “USB Battery”,
price: 15.0 },
{ id: 512,
title : “Hip T-shirt”,
price : 45.0 }
],
...
}

22. Updating Arrays: Some Elements
orders:
{
_id: 5,
line_items : [
{ id: 123,
title : “USB Battery”,
price: 15.0 },
shipped: true
{ id: 512,
title : “Hip T-shirt”,
price : 45.0,
shipped: false }
],
}

23. Updating Arrays: Some Elements
db.orders.update(
{ _id: 5 },
{ $mul: {
"line_items.$[li].price",
0.8}},
arrayFilters:[
{"li.shipped":{$ne:true}}
]
)
orders:
{
_id: 5,
line_items : [
{ id: 123,
title : “USB Battery”,
price: 15.0 },
shipped: true
{ id: 512,
title : “Hip T-shirt”,
price : 45.0,
shipped: false }
],
}

24. { "_id" : 1,
"questions" : [
{
"question" : "What is thy favorite color?",
"choices" : [
{ "text" : "Blue",
"is_correct" : true },
{ "text" : "Green",
"is_correct" : false }
]
}
],
"description" : "Pass the test to cross the bridge.”
}
Updating Arrays: Nested

25. SCHEMAJSON

26. JSON Schema In Action
$json_schema: {
properties: {
line_items: {
type: "array",
items: {
properties: {
title: {type: "string"},
price: {type: "number", minimum: 0.0} },
required: ["_id", "title", "price"],
additionalProperties: false }}},
required: ["line_items"]}
}

27. Retryable
Writes

28. Retryable Writes In 3.6
# Start a session for retryable writes.
with client.start_session(retry_writes = True) as session:
collection = session.my_db.my_collection
result = collection.update_one({'_id': 1},
{'$inc': {'n': 1}})

29. It’s 10:00 pm:
Do You Know Where Your
Writes Are?
Speaker:
Jeremy Mikola
Location:
Room AB
Time:
11:10am

30. Localhost only
by default

31. It's a Dangerous World:
From OS Through
Application, Securing Your
MongoDB Infrastructure
Speaker:
Steffan Mejia
Location:
Room D
Time:
10:20am

32. Change Streams

33. # Subscribe to change notifications in a collection.
cursor = client.retail.orders.changes([
{'$match': {'operationType':
{'$in': ['insert', 'replace']}}},
{'$match': {'newDocument.shipping.zip': {'$gte': 1}}}
])
# Loops forever.
for change in cursor:
print(change['newDocument'])
Change Streams in Action

34. Using Change Streams to
Keep Up with Your Data
Speaker:
Aly Cabral
Location:
Room AB
Time:
12:00pm

35. MongoDB Server
3.6

36. MongoDB
Atlas

37. It should be irresponsible
to run MongoDB in the cloud
without Atlas

38. • Reliability
• Security
• Ease
• Elasticity
Why Atlas

39. • 4500 Production Atlas clusters
• 54k+ free clusters
• 190 countries
Atlas Adoption

40. • Free tier
• Live migration service
• Data browser
• Real-time performance viewer
• Queryable backups
Atlas Evolution YTD

42. M2 and M5
Instance sizes

43. Cross-Region
Clusters

44. Andrew Davidson
Sr. Product Manager,
MongoDB Atlas
Demo:
MongoDB Atlas

45. Atlas: Coming Soon
• Performance Advisor
• Full CRUD support
• Managed BI Connector
• Charts Integration
• Cross Cloud
• LDAP Authentication
• KMIP Integration
• Disk Auto-Scaling

46. Your smart global database

47. MongoDB
Stitch

48. 2007 2010
Distributed
Systems
2012
Aggregation
Framework
2013
Mgt.
& Security
2014
WiredTiger
2015
Doc Validation,
JOINs, Compass,
BI Connector
2016
MongoDB
Atlas
Core Run AnywhereEnterprise-Ready
Document
Model

49. • Web as 1st-class UI
• Mobile
• IoT
What’s Changed Since 2007

50. Services
Amazon
SES

51. • An API to do CRUD
• Security, access control logic, and validation
• A way to stitch services together
A Modern App Needs…

52. • Custom Node/Python/Rails app
• Lots of boilerplate
• DIY Security & Privacy
How Do We Do That Today?

53. • Can’t get at data
• Can’t use other services
• Locked in
MBaaS, Paas, Serverless

54. • REST API for MongoDB
• Configuration based authentication, privacy, and security
• Service composition
• Anywhere you want
MongoDB Stitch: Backend as a Service

55. Stitch Architecture
Stitch
Amazon
S3
> db.users.find

56. Eliot Horowitz
(That’s me!)
CTO & Co-Founder
Demo:
MongoDB Stitch

57. Stitch Use Cases
Add a feature to an
existing application
Selectively expose
existing data to new
applications
Integrate with
services
Be your complete
backend

58. Building Your First App
with MongoDB Stitch
Speaker:
Drew DiPalma
Location:
Room AB
Time:
10:20am

59. Implementing Your Full
Stack App with MongoDB
Stitch (two-parter)
Speaker:
Drew DiPalma
Location:
Room D
Time:
1:45pm and 2:35pm

60. # M D B l o c a l
CTO & Co-
Founder
Eliot Horowitz
MongoDB @eliothorowitz
Eliot Horowitz