ScannedBlocks是什么意思(

oracle中all_al_tables试图各字段是什么意思,麻烦大神解释一下!_百 ...
NUM_FREELIST_BLOCKS NUMBER Number of blocks on the freelist DEGREE VARCHAR2(10) Number of threads per instance for scanning the table INSTANCES VARCHAR2(10) Number of instances across which the table is to be scanned CACHE VARCHAR2(5) Indicates whether the 等我继续说。