Oracle 查询表空间使用情况

通过查询dba_free_space表可以了解一个tablespace的空间使用情况。

TABLESPACE_NAME：
    Name of the tablespace containing the extent
FILE_ID：
    ID number of the file containing the extent
BLOCK_ID：
    Starting block number of the extent
BYTES：
    Size of the extent in bytes
BLOCKS：
    Size of the extent in ORACLE block

1。查询表空间的free space

SQL> select
  2      tablespace_name,
  3      count(*) as extends,
  4      round(sum(bytes)/1024/1024, 2) as MB,
  5      sum(blocks) as blocks
  6  from dba_free_space group by tablespace_name;

TABLESPACE    EXTENDS         MB     BLOCKS
---------- ---------- ---------- ----------
UNDOTBS1           16     771.69      49388
SYSAUX             46       8.44        540
BLOBS             375     805.63      51560
USERS             645      67.69       4332
SYSTEM              1       4.75        304
INDX             1871    1071.56      68580
WCAUDIT             1     499.94      31996

2. 查询表空间的总容量

SQL> select tablespace_name, sum(bytes)/1024/1024 as MB from dba_data_files group by tablespace_name;

TABLESPACE         MB
---------- ----------
SYSAUX            340
UNDOTBS1          805
BLOBS            1000
USERS            6984
SYSTEM            360
WCAUDIT           500
INDX             1500

 

3. 查询表空间使用率

SQL> select
  2      total.tablespace_name,
  3      round(total.MB,2) as Total_MB,
  4      round(total.MB-free.MB, 2) as Used_MB,
  5      round((1-free.MB/total.MB)*100, 2) as Used_Pct
  6  from
  7      (select tablespace_name, sum(bytes)/1024/1024 as MB from dba_free_space group by tablespace_name) free,
  8      (select tablespace_name, sum(bytes)/1024/1024 as MB from dba_data_files group by tablespace_name) total
  9  where
 10      free.tablespace_name=total.tablespace_name;

TABLESPACE   TOTAL_MB    USED_MB   USED_PCT
---------- ---------- ---------- ----------
UNDOTBS1          805      33.31       4.14
SYSAUX            340     331.56      97.52
BLOBS            1000     194.38      19.44
USERS            6984    6916.31      99.03
SYSTEM            360     355.25      98.68
INDX             1500     428.44      28.56
WCAUDIT           500        .06        .01