Installation and Initial Configuration 1-23
Root Dbspace Configuration Guidelines
ROOTSIZE
ROOTSIZE specifies the size of the initial chunk of the root dbspace, expressed
in kilobytes. The size that you select depends on your immediate plans for
OnLine.
The ROOTSIZE default value is 20,000 KB (about 19.5 MB).
If you are configuring OnLine for a learning environment, plan to make the
root dbspace 20 to 60 MB. If you plan to add test databases to this system,
choose the larger size. Enter this value in two places on the configuration
worksheet. First, enter it as the size of the root dbspace in the ROOTSIZE field.
Second, enter it into the field labeled Size of the root dbspace on the
second page under the heading Disk Layout.
If you are configuring OnLine for a production environment, you need to
calculate an appropriate size for the root dbspace.
At the time of initial configuration, the root dbspace must be large enough to
accommodate five possible components:
■ Physical log
■ Logical log files
■ Disk space allocated to accommodate temporary internal tables
needed by OnLine for processing
■ Disk space allocated to accommodate any databases or tblspaces that
you might want to store in the root dbspace
■ Disk space to accommodate OnLine control information
Your worksheet contains blanks for you to enter the sizes of these component
parts of the root dbspace, as you determine them. Do not complete this
section of your worksheet now. You will complete each blank, A through J, as
you work through the disk allocation tasks. (Refer to page 1-40.)
