在Oracle DB中检查表片段，运行以下SQL命令：
select
table_name,
avg_row_len,
round(((blocks*16/1024)),2)||'MB' "TOTAL_SIZE",
round((num_rows*avg_row_len/1024/1024),2)||'Mb' "ACTUAL_SIZE",
round(((blocks*16/1024)-(num_rows*avg_row_len/1024/1024)),2) ||'MB' "FRAGMENTED_SPACE",
(round(((blocks*16/1024)-(num_rows*avg_row_len/1024/1024)),2)/round(((blocks*16/1024)),2))*100 "percentage"
from
all_tables
where
round(( (blocks*16/1024) ),2) > 0
order by 6 desc;