Global buffers refers to a group of buffers allocated in shared memory and used to read and write data stored in the RDAREAs on a disk. A buffer that is designed to hold data that has been updated but not yet written to a database is called an update buffer. A buffer that is designed for referencing data or that holds data that has already been written to a database is called a reference buffer.
Global buffers must be allocated for RDAREAs that store data and indexes. There are three types of global buffers:
Addition, modification, or deletion of global buffers while HiRDB is operating is called dynamic updating of global buffers. The pdbufmod command is used for dynamic updating. For details about dynamic updating of global buffers, see the manual HiRDB Version 8 System Operation Guide.
This section describes the various methods of allocating global buffers.