4.3.4 Estimating memory requirements during execution of the adbgetcst command

The following table shows the formula for calculating the amount of memory required when the adbgetcst command is executed.

Table 4‒6: Memory requirement determinations (during execution of the adbgetcst command)
No.	Memory type		Formula (megabytes)	Related server definitions
1	Shared memory	Shared memory management area	`100`	None
2		Global buffer page	`dbarea_num` `× 1,024`	`adbbuff` operand
3		Process common memory	`1,024 +` `max_users` `+` `GBUF`	`adb_sys_proc_area_max` operand `adbbuff` operand
4		Real thread private memory	`rthd_num` `× 512`	`adb_sys_rthd_area_max` operand
5	Process memory	Heap memory	`1,024`	None

Explanation of the variables

dbarea_num: Number of data DB areas: If this value cannot be estimated, use the combined total number of tables and indexes that will be defined.
max_users: Value specified for the adb_sys_max_users operand in the server definition
GBUF: Global buffer: Assume 20 megabytes for each 400 megabytes of the global buffer page size calculated in No. 2.
rthd_num: Value specified for the adb_getcst_rthd_num cost-information collection option