Managing file and table sizes

There are two ways maintain table sizes: setting up the Auto Increase parameters in the file so that free space is added to the tables as needed; or the File Manager may use a number of commands to maintain the table sizes.

The latter is described below.

Overview of Capabilities

Because of the hashed nature of Tables A and C, these tables can only be changed with the CREATE command during a file reorganisation.

The other tables may be modified using the INCREASE and DECREASE command, as follows:

Command	Description	Exclusive Access?	Limitations
INCREASE DATASET	Add an additional dataset to a Model 204 file.	No	A model 204 file may have up to 255 datasets The additional pages are formatted as free space
INCREASE TABLEB	Move pages from free space to Table B	No, but the DYNAMIC sub-parameter is required if you don't have exclusive access	segment boundaries need to be taken into account the MAXINCBP parameter needs to be set if you wish to increase Table B beyond the current segment boundary.
INCREASE TABLED TABLEE or TABLEX	Move pages from free space to this table	No	Up to maximum table size
DECREASE TABLEB TABLED TABLEE TABLEX	Move pages to free space from the respective table	Yes	Only if the _HIGHPG statistic permits it