The document discusses different types of databases including relational databases, NoSQL databases, and big data solutions. It provides examples of when to use each type and highlights key features like schema flexibility, scalability, availability, and query languages. While SQL databases are mature, NoSQL databases provide more flexibility and the ability to handle large, unstructured data. The choice of database depends on the specific needs and tradeoffs around features.

1. DatabasestheChoiceIsYoursPhilipp Krenn @xeraa

5. Infrastructure | Developer Advocate

7. "relationalmodeland
normalform"
↓
"dataindependence"

8. RelationalAlgebra
Book "Seven Databases in Seven Weeks"

10. Declarative
Implementation detail of the RDBMS
(Query Optimizer)

11. UserInteraction
Aggregated reports
Concurrency, integrity, consistency,
type-safety

12. From a
WideVarietyofDatabases
to
ADarkAge

14. http://blog.8thlight.com/uncle-bob/
2012/05/15/NODB.html

15. Slow&
inflexible

16. SchemaFlexibility
http://pragprog.com/magazines/
2012-05/beyond-the-bit-bucket

20. NoSQL
Not Only SQL

23. BigData
Very broad, including NoSQL
Offline data / data warehouse,
Hadoop & Spark

25. http://db-engines.com/en/ranking

27. CouchDB, Couchbase, Elasticsearch,...

28. TedNeward:ORMis"TheVietnam
ofComputerScience"
http://blogs.tedneward.com/post/the-vietnam-of-computer-
science/

29. @OneToMany(mappedBy = "destCustomerId")
@ManyToMany
@Fetch(FetchMode.SUBSELECT)
@JoinTable(name = "customer_dealer_map",
joinColumns = {
@JoinColumn(name = "customer_id",
referencedColumnName = "id")},
inverseJoinColumns = {
@JoinColumn(name = "dealer_id",
referencedColumnName = "id")})
private Collection<Client> dealers;

31. public abstract class EmployeeEntity {
protected String name;
}
public class ManagerEntity extends EmployeeEntity {
protected Boolean approveFunds;
}
public class WorkerEntity extends EmployeeEntity {
protected Integer yearsExperience;
}

32. RDBMS
1. Union table with (many) NULL
values

33. RDBMS
2. Concrete instances without common
queries

34. RDBMS
3. Base table JOINed with concrete
instances

35. @Entity(value = "employee")
public abstract class EmployeeEntity {
@Id
protected ObjectId id;
protected String name;
}
public class ManagerEntity extends EmployeeEntity {
protected Boolean approveFunds;
}
public class WorkerEntity extends EmployeeEntity {
protected Integer yearsExperience;
}

36. {
"_id": ObjectId("5461c8bf9e2acf32ed50c079"),
"className": "net.xeraa.morphia_demo.entities.ManagerEntity",
"name": "Peter",
"approveFunds": true
}
{
"_id": ObjectId("524d9fe7e4b0f8bd3031f84e"),
"className": "net.xeraa.morphia_demo.entities.WorkerEntity",
"name": "Philipp",
"yearsExperience": 10
}

38. Key-ValueStore
andmore
REmote DIctionary Server

39. Statistics(Login)
Bitset
HyperLogLog

40. Bitset
First user bit 1, second user bit 2,...
A million users ~123KB

41. HyperLogLog
Unique elements in 12KB regardless of
their number
Error rate ~0,81%
http://redis.io/commands/pfcount

42. Comparison
HyperLogLog: constant size
Bitset: exact & aggregates

44. Scalable&highly
available
Consistent Hashing

50. Eventuallyconsistentwastoo
hard,sowewentwith
immediatelyinaccurate.
— https://twitter.com/mysqlborat/status/621785755107524608

53. SQLDatabases
not only RDBMS

54. CassandraQueryLanguage(CQL)
GoogleQueryLanguage(GQL)
CouchbaseN1QL
RethinkDBQueryLanguage(ReQL)

55. RDBMSfeatures&maturity
+
NoSQLinfluence

57. Full-TextSearch

60. DocumentScore
Term Frequency (TF) / Inverse
Document Frequency (IDF)
Field-length norm
https://www.elastic.co/guide/en/elasticsearch/guide/current/scoring-theory.html

62. Conclusion

64. Butisitfast?

67. Thanks!
Questions?Swag
@xeraa

68. Credits
Schnitzel https://flic.kr/p/9m27wm
Architecture https://flic.kr/p/6dwCAe
Conchita https://flic.kr/p/nBqSHT
Twelve: https://flic.kr/p/3iRDd9
Consistent hashing https://
highlyscalable.wordpress.com/2012/09/18/

69. Credits
Full-text search https://developer.apple.com/
library/mac/documentation/UserExperience/
Conceptual/SearchKitConcepts/
searchKit_basics/searchKit_basics.html
No, SQL https://twitter.com/edd/status/
400190499585544192