SimpleDb, an introduction

Amazon SimpleDB A quick intro Paolo Negri twitter @hungryblank

DB? •SimpleDB •CouchDB •MongoDB

DB? http://www.ﬂickr.com/photos/zheem/3091325244/

Key Value store? http://www.ﬂickr.com/photos/wdwbarber/1338954161/

A bit like... • BigTable • HyperTable • Redis • TokyoCabinet • ...

Different Shades DB > KV > http://www.ﬂickr.com/photos/dey/11717609/

Commonalities Schema less N O Just store your data

Commonalities • No transactions • No relations • No datatypes (some)

0.7 seconds to store 1 million records Fast (TokyoCabinet) http://www.ﬂickr.com/photos/donsolo/1405885541/

Big datasets SimpleDB 1.000.000.000 attributes/domain * 100 domains http://www.ﬂickr.com/photos/digitalart/2101765353/

Key Value A D H1 A6   < Key data data data data < Value  

SimpleDB A T W           < Key data data } Attribute > Attribute value > < Value

SimpleDB Nested hash of strings

SimpleDB • Only strings • No schema (no attribute declaration) • up to 256 attributes per item • EVERYTHING INDEXED

SimpleDB         <   Key Attribute > W Attribute value > • 1024 K max length   • Any UT8 character that is valid in XML docs can be used

SimpleDB • 1.000.000.000 attributes per domain • 100 domains per account • you can have more than one account

SimpleDB <wtf>wtf</wtf> SOAP protocol http://www.ﬂickr.com/photos/rescuedog/2242215507

SimpleDB Or “REST” http://sdb.amazonaws.com/? AWSAccessKeyId=BLAHBLAH&Action=PutAttributes&Attribute. 0.Name=code&Attribute. 0.Value=31&DomainName=test_domain&ItemName=bar41&Sign atureMethod=HmacSHA256&SignatureVersion=2&Timestamp=20 09-06-07T23%3A15%3A50Z&Version=2007-11-07&Signature=...

SimpleDB request REST or XML SimpleDB Host response XML

SimpleDB Requests • create/delete domain • put/get/delete (selectively) attributes • and... SELECT

SimpleDB Domain: a container of (nested) key value • Up to 10GB big • Up to 1.000.000.000 attributes stored

SimpleDB - PUT

SimpleDB - GET you pay bandwidth :)

Oh yes, $$ • first GB data IN free, 0.10$ after • first GB data OUT free, 0.17$ or less after • first GB stored is free, 0.25GB/month after

So, PUT again + =

Attribute values are always arrays           < Key } Attribute > < Value Array Attribute value > Even if there’s only one value!!

Select • Sort • Multiple conditions • Understands only strings! • So you need to think when you store your data

Gems • hungryblank-aws_sdb_bare (github) very low level one to one mapping with SimpleDB calls • right_aws high level, active recordish api and an hash api • aws-sdb not any more mantained but still working

SimpleDB - Cons • Eventual Consistency - Data is not immediately propagated across all nodes… the latency is usually around a second • Latency specially if you’re not on ec2 • Protocol - if compared with json stores • Only strings, lexicographical string only

SimpleDB - Pros • Is basically free to try out • Everything is indexed • Distributed • Replicated • Completely hosted on Amazon system

Q? Paolo Negri twitter @hungryblank

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SimpleDb, an introduction

by Paolo Negri on Jun 09, 2009

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