Files that were used by 32-bit mode HiRDB can generally be used by 64-bit mode HiRDB. However, the following files are not compatible with 64-bit mode HiRDB and cannot be used.

• Backup files
• HiRDB files that consist of a master directory RDAREA and a data directory RDAREA

The default values of the HiRDB system definition operands shown in the following table change when HiRDB is migrated from 32-bit mode to 64-bit mode.

Table 1-6 Operands with altered default values

Operand name	Specified item	Default value in 32-bit mode	Default value in 64-bit mode
pd_work_buff_size	Work table buffer size	HiRDB/Single Server: 384# HiRDB/Parallel Server: 1024#	5120#
pd_fes_lck_pool_size	Lock pool size of front-end server	{(pd_max_users value + 3) x (pd_max_access_tables value + 4)} 6	{(pd_max_users value + 3) x (pd_max_access_tables value + 4)} 4
SHMMAX	Upper limit for shared memory segment size	200 MB	1,024 MB

#

This is the default value if the pd_work_buff_mode operand is omitted or if pool is specified. The default value when each is specified as the pd_work_buff_mode operand remains unchanged.

When HiRDB is migrated from 32-bit mode to 64-bit mode, more memory is required. For details about calculating memory requirements, see Chapter 15. Storage Requirements for HiRDB.

When HiRDB is migrated to 64-bit mode, the UOC interface changes for the database creation utility (pdload) and the database reorganization utility (pdrorg). This means that the UOC must be re-created. For details about the UOC interface, see the manual HiRDB Version 9 Command Reference.