分区类型：rang、list、hash
sql语句：select partitioning_type, subpartitioning_type,partition_count from user_part_tables where table_name ='RANGE_PART_TAB';
子分区：range-range、list-list、list-hash、list-range
分区总数：select partition_count from user_part_tables where table_name='表名'；
在哪一个列上建分区：
select column_name, object_type, column_position from user_part_key_columns where name='RANGE_PART_TAB';
分区到底有多大：
select sum(bytes)/1024/1024 from user_segments where segment_name='RANGE_PART_TAB';
有多少个分区：
select partition_name,segment_type,bytes from user_segments where segment_name='RANGE_PART_TAB';
分区表的统计信息收集情况：
select table_name,partition_name,last_analyzed,partition_position,num_rows from user_tab_statistics t where table_name='RANGE_PART_TAB';
查该分区表有无索引，分别什么类型,全局索引是否失效，此外还可看统计信息收集情况:
select table_name,index_name,last_analyzed,blevel,num_rows,leaf_blocks,distinct_keys,status from user_indexes where table_name='RANGE_PART_TAB';
(N/A代表局部索引，否则就是全局索引)
分区表在哪些列上建了索引:
select index_name,column_name,column_position from user_ind_columns where table_name='RANGE_PART_TAB';
该分区表上的各索引分别有多大:
SQL> select segment_type,sum(bytes)/1024/1024 M from user_segments where segment_name in (select index_name from user_indexes where table_name='RANGE_PART_TAB') group by segment_name,segment_type;
该分区表的索引段的分配情况：
select segment_name,partition_name,segment_type,bytes
from user_segments
where segment in (
select index_name from user_indexes where table_name='RANGE_PART_TAB');
分区索引相关信息及统计信息、是否失效查看:
select t2.table_name,
t1.index_name,
t1.partition_name,
t1.last_analyzed,
t1.blevel,
t1.num_rows,
t1.leaf_blocks,
t1.status
from user_ind_partitions t1, user_indexes t2
where t1.index_name = t2.index_name
and t2.table_name='RANGE_PART_TAB';
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