CBO에서 사용되는 통계정보가 저장된 Data Dictionary 정보

http://ssiso.net/cafe/club/club1/board1/content.php?board_code=oracle%7Coratip&idx=31456&club=oracle

[USER|ALL|DBA]_TABLES : Table의 통계정보
NUM_ROWS,BLOCKS,AVG_ROW_LEN,SAMPLE_SIZE,LAST_ANALYZED

[USER|ALL|DBA]_INDEXES : Index의 통계정보
BLEVEL,LEAF_BLOCKS,DISTINCT_KEYS,AVG_LEAF_BLOCKS_PER_KEY,
AVG_DATA_BLOCKS_PER_KEY,CLUSTERING_FACTOR,NUM_ROWS,SAMPLE_SIZE,LAST_ANALYZED

[USER|ALL|DBA]_TAB_COLUMNS : Column의 통계정보
NUM_DISTINCE,LOW_VALUE,HIGH_VALUE,DENSITY,NUM_NULLS,NUM_BUCKETS,
LAST_ANALYZED,SAMPLE_SIZE,AVG_COL_LEN

[USER|ALL|DBA]_TAB_HISTOGRAMS : Column의 Data 분포도 정보
TABLE_NAME, COLUMN_NAME,ENDPOINT_NUMBER,ENDPOINT_VALUE,ENDPOINT_ACTUAL_VALUE