1. Polyglot persistence with Azure data storage services. SQL Database, Azure Table Storage and Document DB Thuru@thurutweetswww.thuru.net June 18, 2016

2. A little history  Need for relational databases  Relational databases  Object databases ?  NoSQL databases  Polyglot persistence www.thuru.net2 |

3. Why NoSQL www.thuru.net3 |

4. Why NoSQL  Data that do not naturally fit into relational model.  Cluster / Scale out friendliness  Fast ?  Schema Less ?  Easy development ? www.thuru.net4 |

5. Polyglot Persistence Heterogeneous persistence technologies. Commonly refers to relational and NoSQL mix www.thuru.net5 |

6. Design an online forum www.thuru.net6 |  Forum members can post questions under categories.  Forum members can reply to posts.  Users have points based on their forum contribution.

7. Azure Table Storage www.thuru.net7 |  Column based NoSQL  Partition keys and row keys

8. Azure Table Storage www.thuru.net8 |

9. Azure Table Storage www.thuru.net9 | Point Query – Query based on Partition Key and Row Key, retrieves single entity. Range Query – Query based on Partition Key and range of Row Keys, retrieves multiple entities. Partition Scan – Partition Key is used but Row Key is not known / not used in the in the query, other non-key fields might be used. Table Scan – Partition Key is not used in the query, other key fields might be used.

10. Azure Table Storage www.thuru.net10 | Categories Users

11. A lap around Azure Table Storage www.thuru.net11 | https://thuru.net/2015/12/30/design-an-online-forum-application-on-azure- table-storage/ https://www.troyhunt.com/working-with-154-million-records-on/

12. Concurrency in Azure Table Storage  By default optimistic concurrency is supported.

13. Document DB

14.  Different collections for each entity ?  What about cost ?

15. Some Techniques

16. Polyglot  Have categories and user data in relational  Along with the payment details  Forum data is in Document DB

17. A lap around Document DB www.thuru.net17 | https://thuru.net/2016/01/10/design-an-online-forum-on-azure-document-db/

18. Consistency levels of Document DB  Strong  Session  Bounded Staleness  Eventual https://azure.microsoft.com/en-us/documentation/articles/documentdb-consistency-levels/

19. Indexing in Document DB  Consistence  Lazy  None

20. One single take away www.thuru.net20 | NoSQL technologies provide solutions for issues that relational databases do not naturally provide. At the same time, designing an application on top of a NoSQL technology requires specific technology dependent design decisions and architecture. Modern applications demand polyglot persistence.

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