关于resync catalog

咱们知道，咱们能够用resync catalog来同步controlfile和recovery catalog。那这个同步是单向仍是双向的呢？也即，若是控制文件中没有任何的备份信息了，是否能够从recovery catalog中同步回来。

RESYNC CATALOG Perform a full resynchronization, which creates a snapshot control file and then copies any new or changed information from that snapshot control file to the recovery catalog.

答案是否认的。同步只是从控制文件更新到recovery catalog。