May 2012
Intermediate to advanced
200 pages
3h 39m
German
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Compaction (Verdichtung)
Da CouchDB einen Append-Only B-Tree implementiert hat und somit Änderungen an Datensätzen immer nur an den B-Tree (binärer Suchbaum) angehängt werden, ist CouchDB relativ speicherintensiv. Die Vorteile eines solchen Vorgehens liegen auf der Hand: CouchDB verhält sich ähnlich wie eine Logdatei, bei der Änderungen immer nur hinten angehängt werden. Der Server muss also bei Änderungen nicht erst die richtige Stelle in der Datei suchen und dann ändern oder ggf. andere Daten umschichten. Deswegen gibt es auch keinen Shutdown-Befehl für CouchDB. Sie werden somit auch nicht erleben, dass Sie ein Wochenende damit verbringen müssen, irgendwelche ISAM-Checks zu machen oder eine Tabelle zu reparieren. Jedoch hat das auch zur Folge, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.