--查询数据库中表的记录数 按记录数排名
select * from user_tables t where t.NUM_ROWS is not null order by t.NUM_ROWS desc
--查询数据库中表的存储空间, 按空间大小排名
select * from user_segments s where s.BYTES is not null order by s.BYTES desc
--查询数据库表空间是否是自动扩展
select a.FILE_NAME,a.TABLESPACE_NAME,a.AUTOEXTENSIBLE from dba_data_files a
--查询数据库各表空间的分区情况
select a.tablespace_name,count(*) from USER_TAB_PARTITIONS a
group by a.tablespace_name
--查看数据库的分区表
select * from user_part_tables
--查看oracle表所有注释
select * from user_tab_comments
--获取字段注释:
select * from user_col_comments
--查看表空间使用率
SELECT a.tablespace_name
"表空间名"
,
total
"表空间大小"
,
free
"表空间剩余大小"
,
(total - free)
"表空间使用大小"
,
total / (
1024
*
1024
*
1024
)
"表空间大小(G)"
,
free / (
1024
*
1024
*
1024
)
"表空间剩余大小(G)"
,
(total - free) / (
1024
*
1024
*
1024
)
"表空间使用大小(G)"
,
round((total - free) / total,
4
) *
100
"使用率 %"
FROM (SELECT tablespace_name, SUM(bytes) free
FROM dba_free_space
GROUP BY tablespace_name) a,
(SELECT tablespace_name, SUM(bytes) total
FROM dba_data_files
GROUP BY tablespace_name) b
WHERE a.tablespace_name = b.tablespace_name