The document describes the structure of various user activity log collections stored in different databases. It includes collections for errors, access logs, attribute changes, status changes, and purchase charges with details on the fields captured for each user event.
MongoDB - 初めてのMongoDB - MongoDBを使ったプログラムの作成 - Python を通してみる MongoDB(更新と削除) | Kamimura's blog
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HadoopとMongoDBを活用したソーシャルアプリのログ解析
