This ppt gives brief introduction of some most popular distributed databases.

1. Travel through some
popular Distributed
Databases
Sagar Chaturvedi

2. Agenda
• MySQL cluster overview
• MariaDB Galera cluster overview
• Percona XtraDB cluster overview
• Features Comparison
• Performance Comparison

3. MySQL Cluster - Introduction
• A technology providing clustering for MySQL database.
• NDB(Network Database) engine combines with MySQL
database.
• Shared nothing architecture with no single point of failure.
Type: RDBMS
Documentation: http://dev.mysql.com/doc/refman/5.5/en/mysql-cluster.html
License Type GPL (Community Edition)
Last Release Date 12th March,2013(7.2.12)
Release Frequency 1 month approximately
Mailing List/Community support http://lists.mysql.com/cluster
Major Applications/Users
PayPal, Telenor, Alcatel Lucent,Big Fish, AT & T,US Navy
Stability Stable version "7.2.12".

4. MySQL Cluster - Analysis
Merits –
• Auto Sharding
• Replication (Synchronous and Asynchronous
both)
• Shared nothing architecture
• SQL and NoSQL APIs(REST,HTTP, Java, C++,
JavaScript etc)
• GUI Manager available
• Supports multiple platforms e.g. Windows, Linux,
Solaris, Mac OS X
Demerits –
• No automatic node provisioning

5. MySQL Cluster - Architecture

6. MariaDB Galera Cluster -
Introduction
• A technology providing clustering for MariaDB database.
• Galera library is combined with MariaDB database using
replication APIs.
• Synchronous multi-master cluster.
Type:
RDBMS
Documentation:
https://kb.askmonty.org/en/galera/
http://www.codership.com/wiki/doku.php
License Type
GPL
Last Release Date
5th March,2013(5.5.29)
Release Frequency
3 months approximately
Mailing List/Community support
https://lists.launchpad.net/maria-discuss/
Major Applications/Users
Hybris, Drupal commerce, Typo 3,Asterisk VoiP
Stability
Stable version "5.5.29".

7. MariaDB Galera Cluster -
Analysis
Merits -
• Synchronous replication
• Multi-master topology : Each node can read and
write on any other node
• Read and write to any cluster node
• Automatic node provisioning
Demerits –
• Available only for Linux.
• Only SQL support.
• No GUI manager

8. MariaDB Galera Cluster -
Architecture

9. Percona XtraDB Cluster -
Introduction
• A high availability and high scalability solution for
Percona/MySQL users.
• Integrates Percona/MySQL Server with the Galera
library.
Type:
RDBMS
Documentation:
http://www.percona.com/doc/percona-xtradb-cluster/index.html
License Type
GPL
Last Release Date
17th April,2013(5.5.30-23.7.4)
Release Frequency
2 months approximately
Mailing List/Community support
https://groups.google.com/forum/?fromgroups#!forum/percona-discussion
Major Applications/Users
Ask.com, BBC, cisco, StumbleUpon
Stability
Stable version "5.5.30-23.7.4".

10. Percona XtraDB Cluster -
Analysis
Merits -
• Synchronous replication. Transaction either
committed on all nodes or none.
• Multi-master replication. You can write to any node.
• Automatic node provisioning
• No central management. You can loose any node at
any point of time.
Demerits –
• Overhead of joining new node. The new node has to
copy full dataset from one of existing nodes.
• Available only for Linux.
• Only SQL support.
• No GUI manager

11. Percona XtraDB Cluster -
Architecture

12. Features Comparison
Software
Name
GUI
manager
Replication
Automatic
Node
Provisioni
ng
Auto
sharding(
Auto
Partitionin
g of
tables)
APIs
Platforms
supported
Multi
Master
Topolo
gy
Latency
over WAN
Backup
Mechanis
m
Provided
MySQL
cluster
Yes(Commer
cial)
Synchronou
s/Asynchro
nous
No Yes
SQL/No
SQL
Linux,Windows
,Mac OS X,
Solaris
No High yes
MariaDB
Galera
Cluster
No
Synchronou
s
Yes No SQL Linux Yes Low yes
Percona
XtraDB
cluster
No
Synchronou
s
Yes No SQL Linux Yes Low yes

13. Performance Comparison
• MySQL cluster uses NDB engine
while MariaDB Galera and Percona
XtraDB cluster use Galera engine. So
performance comparison is provided
between NDB and Galera.
• We will be analyzing performances in
2 different cases –
 When 2 Nodes are used
 When 4 Nodes are used

14. Performance Comparison –
With 2 nodes
• Performance of Galera is better than NDB.
• Galera performance drops as number of threads
increase.
• NDB performance increases with no of threads.

15. Performance Comparison –
With 4 nodes
• Performance of Galera is better than NDB when threads are
less.
• Performance of NDB increases consistently as number of
threads increase.
• When no of threads are 512, performance of NDB is better
than Galera as shown in the red circled areas of above
diagrams.

16. Thank You!!!