VKTM - The virtual keeper of time provides wall-clock time and reference time for other sessions/processes.

时间参照进程，为其他进程提供时间参照

FBAR - (sadly now renamed to FBDA partway through the beta) The flashback data archiver writes old row-versions of tables with 'flashback archive' enabled into flashback data archives on commit. Anyone remember Oracle v.5 BIFs?

flashback 数据存档进程，负责写提交的变化数据到归档文件。注意不是归档日志

DIAG - The diagnosibility process (DIAG) runs oradebug commands and triggers diagnostic dumps as part of the new ADR (automatic diagnostic repository) feature, which is a replacement (and major enhancement) for the much-reviled RDA.

诊断进程，使用oradebug命令和触发器来分析产生的dump文件，取代受到责骂的RDA

DIA0 - The "other" diagnosibility process detects hangs then triggers DIAG do take diagnostics.

辅助诊断进程，检测数据库挂起，触发diag进程

SMCO/Wnnn - The space management coordinator and slaves perform space allocation and reclamation.

空间管理进程，执行空间的分配和回收