1. POLYGLOT
PERSISTENCE
alex brandt
sr developer
Wednesday, August 21, 13

2. 2
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3. 3
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4. 4
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5. 5
RDBMS may not be the best fit
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6. 6
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7. 7
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8. INTRODUCTION TO
NOSQL
• NoSQL Database (1998)
• NoREL
• “Not only SQL”
• NoSQL (2009)
8
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9. 9
5 Characteristics
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10. 10
Non-relational
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11. 11
Distributed
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12. 12
Open-source
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13. 13
Horizontally Scalable
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14. 14
Schema-less
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15. orders
customers
order lines
credit cards
ID: 1001
line items:
customer: Ann
0321293533
0321601912
0131495054
2
1
1
$48 $48
$39
$51
$39
$51
payment details:
Card: Amex
CC #: 12345
expires: 04/2001
15
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16. 16
Types in Detail
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17. Key/Value DatabaseS
17
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18. Key/Value DatabaseS
• Good Use Cases:
• Storing Session Information
• User Profiles & Preferences
• Shopping Cart Data
• Bad Use Cases:
• Data Relationships
•Multi-operation Transactions
•Query by Data
18
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19. Key/Value DatabaseS
• Good Use Cases:
• Storing Session Information
• User Profiles & Preferences
• Shopping Cart Data
• Bad Use Cases:
• Data Relationships
•Multi-operation Transactions
•Query by Data
19
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20. document Database
20
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21. document Databases
•Good Use Cases:
• Event Logging
• Blogging Platforms
• Real-time Analytics
• Article storage
• Bad Use Cases:
• Complex Transactions
•Queries against Varying
Aggregate Structures
21
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22. document Databases
•Good Use Cases:
• Event Logging
• Blogging Platforms
• Real-time Analytics
• Article storage
• Bad Use Cases:
• Complex Transactions
•Queries against Varying
Aggregate Structures
22
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23. COLUMN FAMILY
23
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24. 24
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25. COLUMN-FAMILY
datastores
•Good Use Cases:
• Event Logging
• Blogging Platforms
• Counters (page visits)
• Expiring Usage
• Bad Use Cases:
• ACID transactions
required
• Early prototype
applications
25
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26. graph database
26
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27. Amanda
KNOWS
KNOWS
KNOWS
Robert
Gerry
Lamar
KNOWS
App 1
BUILT
BUILT
KNOWS
App 2
USES
BUILT
Christie
KNOWS
Destiny
Jessica
KNOWS
App 3
BUILT
USES
USES
USES
KNOWS
graph database
27
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28. graph databases
•Good Use Cases:
• Connected Data
• Location-based services
• Recommendation engines
• Bad Use Cases:
• Ability to update
specific aggregates
28
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29. Companies using
nosql
29
DATABASE COMPANIES
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30. THE FUTURE IS POLYGLOT
30
Neo4J
database
Cassandra
database
Couch
database
MongoDB
database
RELATIONAL
DATABASE
Graph-structured
domain rules
Columnar data
access with
decentralization
Document
structures
Document structures
with offline
processing
(Actors) (Actors)
(Actors)(Actors)
Asynchronous message passing
MODULE 1
MODULE 2
MODULE 3
MODULE 4
IEEE Software Sept/October 2010 - Debasish Ghosh / Twitter @debasishg
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31. 31
POLYGLOT PATTERN: cache
ORDER
TAKING
RESTAURANT
MANAGEMENT
REDIS
CACHE
MYSQL
DATABASE
SECONDFIRST
CONSUMER
RESTAURANT
OWNER
Credit: @crichardson
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32. 32
POLYGLOT PATTERN:
write to sql and NOSQL
NEW
TWEET
INSERT
LPUSHX
LTRIM
MySQL
TWEETS
FOLLOWS
FOLLOWERS
Redis: Timeline
FOLLOWER 1
FOLLOWER 2
FOLLOWER 3
Avoid
expensive
MySQL joins
Credit: @crichardson
Wednesday, August 21, 13

33. 33
POLYGLOT PATTERN:
REPLICATE FROM
MYsql to NOSQL
QUERY
SERVICE
UPDATE
SERVICE
REDIS
MYSQL
DATABASE
SYSTEM
OF
RECORD
MATERIALIZED
VIEW
READER WRITER
replicate and
denormalize
query() update()
Credit: @crichardson
Wednesday, August 21, 13

34. 34
Atomic
Consistent
Isolated
Durable
ACID to base
Basically Available
Soft state
Eventually consistent
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