VSAM Performance Enhancement › Advanced Topics › Optimizing VSAM Performance by Adjusting VSAM Parameters › Assembly Programming Limitations

Assembly Programming Limitations

VPE looks out for the use of certain assembly programming techniques which are not supported by VSAM when LSR pools are in use. VPE excludes such files from VPE's optimizations because VPE uses LSR pools. The affected assembly programming techniques are:

• CBIC—Control Blocks In Common (specified on the ACB macro).
• ICI—Improved Control Interval access (specified on the ACB macro).
• UBF—User Buffering (specified on the ACB macro).