For V4R2 Null field support Type def. You get storage savings and easier migration of complex applications from other platforms. It improves performance when there's binary data, and it aids migration. In V3R7 we added a set of intrinsic functions. Most of the functions came from the ANSI85 standard but the year 2000 date functions from the ANSI 97 draft were also included.
Performance is always a focus item.
In V3R6, we added an EXIT format in order to keep the named activation group open on the programs exit. This eliminates the substantial overhead of opening and closing activation groups. In V3R7, we added a compiler option in order to collect performance data. Improved National Language Support in Asian countries. You can define and work with a new DBCS data type and with DBCS literals.