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Amazon's Dynamo

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Oct. 3rd, 2007 | 02:06 pm


"Most of these services only store and retrieve data by primary key
and do not require the complex querying and management functionality
offered by an RDBMS. This excess functionality requires expensive
hardware and highly skilled personnel for its operation, making it a
very inefficient solution. In addition, the available replication
technologies are limited and typically choose consistency over

1) Most web work is primary key.
2) Its not transactional.
3) Availability is more important then a lost data

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Comments {8}


(no subject)

from: itman
date: Oct. 3rd, 2007 10:46 pm (UTC)

Yet, I would prefer to have transactions for any buy-selling service.

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Brian "Krow" Aker

(no subject)

from: krow
date: Oct. 4th, 2007 01:17 am (UTC)

You would be surprised....

Some sites do, but the ones that do limit themselves to particular queries where it is crucial.

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(no subject)

from: awfief
date: Oct. 10th, 2007 03:39 am (UTC)


Not require.

The great thing about humans is that we're fault tolerant. Machines are very inflexible. Humans will "understand what you mean" whereas machines choke if a semicolon isn't in the right place.

Meaning that if Amazon.com messes up one order in 100, which is millions of orders per year (!!!) it's actually OK, and cheaper all around to hire someone to apologize (customer service) and fix the problem than it is to have extreme database ACIDity.

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