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Please read the Wikimedia Cloud Services Introduction and the Getting Started guide.
Data Services include services that allow for direct access to databases and dumps, and web interfaces for querying and programmatic access to data stores. The Data Services currently offered are Wiki Replicas (naming under discussion), ToolsDB, Wikimedia Dumps, Shared Storage, Quarry and PAWS.
Wiki Replicas are the sanitized public replicas of production MySQL Mediawiki databases. Access to the Wiki Replicas is granted for users with a ToolForge account automatically. See Help:Tool Labs/Database for how to access the Wiki Replicas.
ToolsDB is a service that allows a Tool shared user to create and maintain a Tool specific database. See Help:Tool Labs/Database#User databases for help on ToolsDB.
Wikimedia Dumps offers a range of data downloads including full text dumps, and other datasets. ToolForge users can directly access dumps data through their Tool account, see Help:Tool Labs#Dumps. VPS users can request to have the share available, see Help:Shared storage#.2Fpublic.2Fdumps
Shared Storage is offered via NFS for ToolForge and VPS users. Shares currently offered are described at Help:Shared storage. The ToolForge environment is setup for access by default, and VPS Projects can access some resources on special request.
Wikimedia Dumps are also offered via the Shared Storage services, but called out separately as a Data Service because of their wide use.
Quarry is a graphical web interface that allows users to write SQL to query the Wiki Replicas. It only needs a Wikimedia (Meta) account to login, and is extensively used by analysts, researchers, and people of all experience levels to easily access the databases. See m:Research:Quarry for help.
PAWS is a Juypter notebooks on the cloud service that hosts python notebooks and a terminal accessible through a web browser. It also only needs Meta account to login, and allows for access to the Wiki Replicas, ToolsDB and Dumps. See PAWS for help.