Configuration parameters that affect critical data

The configuration parameters that configure the root dbspace and the logical and physical logs affect critical data.

You can use the following configuration parameters to configure the root dbspace:
  • ROOTNAME
  • ROOTOFFSET
  • ROOTPATH
  • ROOTSIZE
  • MIRRORPATH
  • MIRROROFFSET

ROOTNAME, ROOTOFFSET, ROOTPATH and ROOTSIZE determine the location and size of the initial chunk of the root dbspace. MIRRORPATH configuration parameter is used to specify the full path name of the mirrored chunk for the initial chunk of the root dbspace and MIRROROFFSET specifies the offset into the disk partition or into the device to reach the chunk that serves as the mirror for the initial chunk of the root dbspace. These parameters have no major impact on performance.

The following configuration parameters affect the logical logs:
  • LOGSIZE
  • LOGBUFF

The LOGSIZE configuration parameter determines the size of each logical-log files. The LOGBUFF configuration parameter determines the size of the three logical-log buffers that are in shared memory.

The PHYSFILE configuration parameter determines the initial size of the physical log in rootdbs. This configuration parameter is used only when the instance is created.