Importance

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Abstract

A database or some portion thereof is partitioned into ownership groups. Each ownership group is assigned one or more database servers as owners of the ownership group. The database servers that are assigned as owners of an ownership group are treated as the owners of all data items that belong to the ownership group. That is, they are allowed to directly access the data items within the ownership group, while other database servers are not allowed to directly access those data items. Accordingly, a database system is provided which includes one or more persistent storage devices having a database stored thereon, and a plurality of database servers executing on a plurality of nodes. Each node has direct access to the persistent storage devices. At least a portion of the database is partitioned into a plurality of ownership groups. Each ownership group is assigned an owner set. Only processes that are executing on database servers that are members of the owner set of an ownership group are allowed to directly access data within the ownership group. Each ownership group is designated as either a shared nothing ownership group or a shared disk ownership group. Each shared nothing ownership group is assigned an owner from among the database servers. Only the owner of each shared nothing ownership group is allowed to directly access data within the shared nothing ownership group. Each of the database servers is allowed to directly access data within ownership groups that are designated as shared disk ownership groups.

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First Claim