SELECT tablespace_name, SUM(BYTES)/1024/1024 "Free Space (MB)" FROM dba_free_space GROUP BY tablespace_name;
追加表空间的语句，里面的路径是服务器的实际路径：
ALTER TABLESPACE UNDOTBS1 ADD DATAFILE 'Z:/app/oradata/MELALEUCADB/UNDOTBS03.DBF' SIZE 1024M AUTOEXTEND ON MAXSIZE UNLIMITED;
Oracle最全的查询表空间sql语句：
SELECT df.tablespace_name tablespace_name,
max(df.autoextensible) auto_ext,
round(df.maxbytes / (1024 * 1024), 2) max_ts_size,
round((df.bytes - sum(fs.bytes)) / (df.maxbytes) * 100, 2) max_ts_pct_used,
round(df.bytes / (1024 * 1024), 2) curr_ts_size,
round((df.bytes - sum(fs.bytes)) / (1024 * 1024), 2) used_ts_size,
round((df.bytes-sum(fs.bytes)) * 100 / df.bytes, 2) ts_pct_used,
round(sum(fs.bytes) / (1024 * 1024), 2) free_ts_size,
nvl(round(sum(fs.bytes) * 100 / df.bytes), 2) ts_pct_free
FROM dba_free_space fs,
(select tablespace_name,
sum(bytes) bytes,
sum(decode(maxbytes, 0, bytes, maxbytes)) maxbytes,
max(autoextensible) autoextensible
from dba_data_files
group by tablespace_name) df
WHERE fs.tablespace_name (+) = df.tablespace_name
GROUP BY df.tablespace_name, df.bytes, df.maxbytes
UNION ALL
SELECT df.tablespace_name tablespace_name,
max(df.autoextensible) auto_ext,
round(df.maxbytes / (1024 * 1024), 2) max_ts_size,
round((df.bytes - sum(fs.bytes)) / (df.maxbytes) * 100, 2) max_ts_pct_used,
round(df.bytes / (1024 * 1024), 2) curr_ts_size,
round((df.bytes - sum(fs.bytes)) / (1024 * 1024), 2) used_ts_size,
round((df.bytes-sum(fs.bytes)) * 100 / df.bytes, 2) ts_pct_used,
round(sum(fs.bytes) / (1024 * 1024), 2) free_ts_size,
nvl(round(sum(fs.bytes) * 100 / df.bytes), 2) ts_pct_free
FROM (select tablespace_name, bytes_used bytes
from V$temp_space_header
group by tablespace_name, bytes_free, bytes_used) fs,
(select tablespace_name,
sum(bytes) bytes,
sum(decode(maxbytes, 0, bytes, maxbytes)) maxbytes,
max(autoextensible) autoextensible
from dba_temp_files
group by tablespace_name) df
WHERE fs.tablespace_name (+) = df.tablespace_name
GROUP BY df.tablespace_name, df.bytes, df.maxbytes
ORDER BY 4 DESC;
这个sql语句可以看到使用率。
