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Fix bad link to Immutability Changes Everything

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Johan Andrén 2018-09-07 15:10:42 +02:00 • committed by GitHub
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akka-docs/src/main/paradox/persistence-schema-evolution.md
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@ -38,7 +38,7 @@ evolution feel free to submit Pull Requests to this page to extend it.
In recent years we have observed a tremendous move towards immutable append-only datastores, with event-sourcing being In recent years we have observed a tremendous move towards immutable append-only datastores, with event-sourcing being
the prime technique successfully being used in these settings. For an excellent overview why and how immutable data makes scalability the prime technique successfully being used in these settings. For an excellent overview why and how immutable data makes scalability
and systems design much simpler you may want to read Pat Helland's excellent [Immutability Changes Everything](http://www.cidrdb.org/cidr2015/Papers/CIDR15_Paper16.pdf) whitepaper. and systems design much simpler you may want to read Pat Helland's excellent [Immutability Changes Everything](http://cidrdb.org/cidr2015/Papers/CIDR15_Paper16.pdf) whitepaper.
Since with [Event Sourcing](http://martinfowler.com/eaaDev/EventSourcing.html) the **events are immutable** and usually never deleted – the way schema evolution is handled Since with [Event Sourcing](http://martinfowler.com/eaaDev/EventSourcing.html) the **events are immutable** and usually never deleted – the way schema evolution is handled
differs from how one would go about it in a mutable database setting (e.g. in typical CRUD database applications). differs from how one would go about it in a mutable database setting (e.g. in typical CRUD database applications).