Introducing Software AG Presto : Presto Core Components : Presto Repository
Presto Repository
The Presto Repository contains meta-data for mashables plus all Presto mashups, views and apps, including related files for apps or views, data snapshots for file-based mashables and scheduled or user-initiated snapshots for mashables or mashups. It also contains information on users and groups, authorization policies, server configuration, macros, taxonomies, notifications and much more.
Data can be separated into three parts:
*Artifacts and Meta-Data: for mashups, mashables, views, apps, and macros. This also includes related files or data, configuration for the Presto Server, authorization policies and so on.
*User Data: for authentication and determining authorization.
Typically user data comes from your organization's LDAP directory which you integrate with Presto. This may also use a single sign-on solution and an identity manager. However, Presto also has a built-in user repository which you may use. User or group meta-data from LDAP allows Presto to relate authorization policies with users.
*Snapshots: represent the results from one invocation of a mashable information source or a mashup. Because space and other quality of service requirements can be quite different for snapshot data, this portion of the Presto Repository can be hosted in a separate database.
Note:  
User or mashable passwords stored in the Presto Repository are encrypted.
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