Vortrag bei de Java User Group Hamburg: „Relationale Datenbanken sind groß, alt, schwer und langsam wie ein Elefant. Richtig gut können die eigentlich gar nichts“, sagt Michael Stonebreaker. Er will den Elefanten mit der Datenbank VoltDB zeigen, dass auch mit ACID und SQL gute Skalierbarkeit und hohe Performance möglich sind.

1. Elefant unter Strom
von OldSql
über NoSQL
zu NewSQL?

2. Moores Law is Broken
processing can't scale-up rather out
Data is Growing
MotivationMotivation

3. Relationale Datenbanken
sind groß, alt, schwer und
langsam wie ein Elefant.
Richtig gut können die
eigentlich gar nichts.
Michael Stonebreaker

4. Relationale Datenbanken
Features
ACID
SQL
Scale-up
Fixed Schema

5. Relationale Datenbanken
Performance
Useful Work
Concurrency
Control
Recovery
Input Output

6. NoSQL
to the rescue?

7. NoSQL Datenbanken
Features
BASE
low-level Query Language
Scale-out
Flexible Schema

8. Basically
Available
Soft state
Eventually consistent
B
A
S
E

9. Why ACID?
It's better to have programmers
deal with performance problems of
transactions, than coding around
the lack of transactions.
Google Spanner

10. Why SQL?
no SQL no Standard
high-level Language

11. NoSQL
over
OldSQL ?

12. Database World
Stonebreaker
Datawarehouse OLTP
others

13. Introducing NewSQL
SQL
ACID
Scale-out
Fixed Schema

14. NewSQL = new Architecture
Single Thread, MVCC
Main Memory
Redundance
Locking
Disk
Recovery
over

15. NewSql Players

16. Introducing
VoltDB

17. VoltDB Architecture
Main Memory
Shared Nothing
ACID
HA and Recovery

18. Getting Started
Create Database
$ voltdb create ­d deployment.xml
Load Database Definition
$ sqlcmd
1> load classes procedures.jar;
2> file schema.sql
SQL and Stored Procedures

19. Schema Changes
Unique Index orr
Remove Column
Live Schema Update
Save and Restore
DDL Statements

20. SQL Stored Procedure
CREATE PROCEDURE lastX AS
SELECT TOP ? * FROM ACTIVITY
ORDER BY end ASC

21. Java Stored Procedure
LastXActivities extends VoltProcedure {
VoltTable[] run(int x) {
voltQueueSQL(
"SELECT TOP ? * FROM ACTIVITY
ORDER BY act_end ASC",
x
);
return voltExecuteSQL();
}
}

22. Async Stored Procedure
client.callProcedure(
new Callback() { … },
"AddActivity",
"Franz",
"Ferkel",
"uuid­3"
)

23. Transaktionen
ein SQL Statement
eine Stored Procedure

24. Partitionen
replicated vs. partitioned Tables
PARTITION TABLE activity ON COLUMN project_id
partitioned Stored Procedures
PARTITION PROCEDURE lastX
ON TABLE activity COLUMN project_id

25. Durability and Recovery
Snapshots
K-Safety
Replication
Command Logging

26. VoltDB
Demo

28. Row 1 Row 2 Row 3 Row 4
0
2
4
6
8
10
12
Column 1
Column 2
Column 3

31. Wrap Up
NewSQL als dritter Weg
ACID and SQL can be fast
Choose your DB carefully

32. Jan Stamer
github.com/remast
jan.stamer@red6-es.de