Logical Units of Storage

The logical units of database server storage fall into the following categories:

• Units of logical storage that are dictated by relational database design:
  • Databases
  • Tables
• Units of logical storage that function as accounting entities:
  • Dbspaces
  • Tblspaces

A tblspace, for example, does not correspond to any particular part of a chunk or even to any particular chunk. The indexes and data that make up a tblspace might be scattered throughout your chunks. The tblspace, however, represents a convenient accounting entity for space across chunks devoted to a particular table. (See Tables.)

Multiple dbspaces managed as a single storage object are as follows:

• Dbslices
• Rootslices
• Logslices

The following sections describe these logical storage units.