存储过程需要将寄存器 EXPLSNAP 设置为 ALL 或 YES，用以收集存取方案。
The stored procedure needs to set the EXPLSNAP register to ALL or YES in order to collect the access plans.
它还规定在存储设备与一组32位矢量寄存器(Vector Register, VR)之间存取和储存的字节、半字、字和四字操作数。
It also provides for byte, halfword, word, and quadword operand fetches and stores between storage and a set of 32 Vector Registers (VRs).
从存储单元或寄存器快速地存取信息的能力。
A capability of accessing information quickly from storage unit or register.
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