咱們知道,咱們能夠用resync catalog來同步controlfile和recovery catalog。那這個同步是單向仍是雙向的呢?也即,若是控制文件中沒有任何的備份信息了,是否能夠從recovery catalog中同步回來。 spa
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.答案是否認的。同步只是從控制文件更新到recovery catalog。