iX V6.5 (30391-90011)

44 Chapter2

Database Structure and Protection

Data Set Types and Relationships

SALES03 is the Chunk Control ﬁle. It has information about the other ﬁles, but no user

data of its own. The remaining ﬁles in the data set are called Chunk Data ﬁles or

chunks.

To specify a jumbo data set, the JUMBO option must be included in the schema before

deﬁning a jumbo data set. Then any data set whose capacity is greater than 4 GB

automatically becomes a jumbo data set. Use the NOJUMBO option of DBSCHEMA to

turn-off the jumbo option. Then any data set whose capacity is greater than 4 GB will

generate an error. For existing databases, you must use a third-party tool to create jumbo

data sets.

NOTE

Any third-party and diagnostic tools used must support jumbo data sets.

DBSTORE does not store a jumbo data set; to store a jumbo data set, use the

STORE command, and specify POSIX names.