A chunk is the largest unit of physical disk dedicated to database server data storage. Chunks provide administrators with a conveniently large unit for allocating disk space.
Some operating systems use the concept of a logical volume, and others use a logical unit. Each of these terms represents the smallest unit of physical disk that you can assign. A database server chunk is the same as a logical volume or a logical unit.
The database server administrator assigns one or more chunks to dbspaces, the logical storage spaces that the database server supports.
The database server administrator typically adds a chunk to these storage spaces when that storage space approaches full capacity. For more information on these logical storage spaces, refer to Logical Units of Storage.
The database server also uses chunks for mirroring. A primary chunk is a chunk from which the database server copies data to a mirror chunk. If the primary chunk fails, the database server brings the mirror chunk online automatically. For more information on mirroring, see Mirroring.
Chunk names follow the same rules as dbspace names. For more details, see Naming Chunks and Storage Spaces.
For information on the maximum size and number of chunks that you can allocate on the database server system, see Limiting Chunk Size and Number.
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