查看临时表空间的使用情况（GV_$TEMP_SPACE_HEADER视图必须在sys用户下才能查询）
GV_$TEMP_SPACE_HEADER视图记录了临时表空间的使用大小与未使用的大小
dba_temp_files视图的bytes字段记录的是临时表空间的总大小:
SELECT temp_used.tablespace_name,
total - used as "Free",
total as "Total",
round(nvl(total - used, 0) * 100 / total, 3) "Free percent"
FROM (SELECT tablespace_name, SUM(bytes_used) / 1024 / 1024 used
FROM GV_$TEMP_SPACE_HEADER
GROUP BY tablespace_name) temp_used,
(SELECT tablespace_name, SUM(bytes) / 1024 / 1024 total
FROM dba_temp_files
GROUP BY tablespace_name) temp_total
WHERE temp_used.tablespace_name = temp_total.tablespace_name
ORDER BY B.TABLESPACE, B.SEGFILE#, B.SEGBLK#, B.BLOCKS;
---查看表空间使用率大于80%的语句
SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
D.TOT_GROOTTE_MB "表空间大小(M)",
D.TOT_GROOTTE_MB-F.TOTAL_BYTES "已使用空间(M)",
TO_CHAR(ROUND((D.TOT_GROOTTE_MB-F.TOTAL_BYTES)/D.TOT_GROOTTE_MB*100,2),'990.99') "使用百分比",
F.TOTAL_BYTES "空闲空间(M)"
FROM (SELECT TABLESPACE_NAME,
ROUND(SUM(BYTES)/1024/1024) TOTAL_BYTES,
ROUND(MAX(BYTES)/(1024*1024),2) MAX_BYTES
FROM SYS.DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F,
(SELECT DD.TABLESPACE_NAME,
ROUND(SUM(BYTES)/1024/1024) TOT_GROOTTE_MB
FROM SYS.DBA_DATA_FILES DD
GROUP BY DD.TABLESPACE_NAME) D
WHERE D.TABLESPACE_NAME=F.TABLESPACE_NAME AND ROUND((D.TOT_GROOTTE_MB-F.TOTAL_BYTES)/D.TOT_GROOTTE_MB*100,2)>80
ORDER BY 2 DESC;
----查看表空间所在的数据文件
select file_name from dba_data_files where tablespace_name='users';
具体情况可根据上述语句灵活改变
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