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--1²é¿´±í¿Õ¼äÒѾ­Ê¹ÓõİٷֱÈ
select   a.tablespace_name,a.bytes/1024/1024
"Sum MB",(a.bytes-b.bytes)/1024/1024   "used MB",b.bytes/1024/1024
"free MB",round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"
from
(select tablespace_name,sum(bytes) bytes from dba_data_files group by tablespace_name)   a,
(select tablespace_name,sum(bytes) bytes,max(bytes) largest from dba_free_space group by tablespace_name)   b
where   a.tablespace_name=b.tablespace_name
order   by   ((a.bytes-b.bytes)/a.bytes)   desc
“Sum MB”±íʾ±í¿Õ¼äËùÓеÄÊý¾ÝÎļþ×ܹ²ÔÚ²Ù×÷ϵͳռÓôÅÅ̿ռäµÄ´óС
±ÈÈ磺test±í¿Õ¼äÓÐ2¸öÊý¾ÝÎļþ£¬datafile1Ϊ300MB£¬datafile2Ϊ400MB£¬ÄÇôtest±í¿Õ¼äµÄ“Sum MB”¾ÍÊÇ700MB
“userd MB”±íʾ±í¿Õ¼äÒѾ­Ê¹ÓÃÁ˶àÉÙ
“free MB”±íʾ±í¿Õ¼äÊ£Óà¶àÉÙ
“percent_user”±íʾÒѾ­Ê¹ÓõİٷֱÈ
--2±ÈÈç´Ó1Öв鿴µ½MLOG_NORM_SPACE±í¿Õ¼äÒÑʹÓðٷֱȴﵽ90%ÒÔÉÏ£¬¿ÉÒԲ鿴¸Ã±í¿Õ¼ä×ܹ²Óм¸¸öÊý¾ÝÎļþ£¬Ã¿¸öÊý¾ÝÎļþÊÇ·ñ×Ô¶¯À©Õ¹£¬¿ÉÒÔ×Ô¶¯À©Õ¹µÄ×î´óÖµ¡£
select   file_name,tablespace_name,bytes/1024/1024 "bytes MB",maxbytes/1024/1024 "maxbytes MB"   from   dba_data_files
  where tablespace_name='MLOG_NORM_SPACE';
--3±ÈÈçMLOG_NORM_SPACE±í¿Õ¼äĿǰµÄ´óСΪ19GB£¬µ«×î´óÿ¸öÊý¾ÝÎļþÖ»ÄÜΪ20GB£¬Êý¾ÝÎļþ¿ìҪдÂú£¬¿ÉÒÔÔö¼Ó±í¿Õ¼äµÄÊý¾ÝÎļþ
ÓòÙ×÷ϵͳUNIX¡¢LinuxÖеÄdf   -gÃüÁî(²é¿´Ï¿ÉÒÔʹÓõĴÅÅ̿ռä´óС)
»ñÈ¡´´½¨±í¿Õ¼äµÄÓï¾ä£º
select   dbms_metadata.get_ddl('TABLESPACE','MLOG_NORM_SPACE')   from   dual;
--4È·ÈÏ´ÅÅ̿ռä×ã¹»£¬Ôö¼ÓÒ»¸öÊý¾ÝÎļþ
alter   tablespace   MLOG_NORM_SPACE
add   datafile   '/oracle/oms/oradata/mlog/Mlog_Norm_data001.dbf'
size   10M   autoextend   on   maxsize   20G
--5ÑéÖ¤ÒѾ­Ôö¼ÓµÄÊý¾ÝÎļþ
select   file_name


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