1.oracle 查看表空间使用情况
1)使用sysdba进入sqlplus --查询表空间使用情况 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') || '%' "使用比", F.TOTAL_BYTES "空闲空间(M)", F.MAX_BYTES "最大块(M)" FROM (SELECT TABLESPACE_NAME, ROUND(SUM(BYTES) / (1024 * 1024), 2) 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(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB FROM SYS.DBA_DATA_FILES DD GROUP BY DD.TABLESPACE_NAME) D WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME ORDER BY 1; --查询表空间的free space select tablespace_name, count(*) as extends, round(sum(bytes) / 1024 / 1024, 2) as MB, sum(blocks) as blocks from dba_free_space group by tablespace_name; --查询表空间的总容量 select tablespace_name, sum(bytes) / 1024 / 1024 as MB from dba_data_files group by tablespace_name; --查询表空间使用率 select total.tablespace_name, round(total.MB, 2) as Total_MB, round(total.MB - free.MB, 2) as Used_MB, round((1 - free.MB / total.MB) * 100, 2) || '%' as Used_Pct from (select tablespace_name, sum(bytes) / 1024 / 1024 as MB from dba_free_space group by tablespace_name) free, (select tablespace_name, sum(bytes) / 1024 / 1024 as MB from dba_data_files group by tablespace_name) total where free.tablespace_name = total.tablespace_name;
2.oracle 扩展表空间
1 第一步:查看表空间的名字及文件所在位置: select tablespace_name, file_id, file_name,round(bytes/(1024*1024),0) total_space from dba_data_files order by tablespace_name 2 第二步:增大所需表空间大小: alter database datafile '表空间位置'resize 新的尺寸 例如: alter database datafile 'oracleoradataanita_2008.dbf' resize 4000m 3 第三步:设置表空间自动扩展 alter database datafile 'oracleoradataanita_2008.dbf' autoextend on next 100m maxsize 10000m 4 查表空间下有哪些表 select TABLE_NAME,TABLESPACE_NAME from dba_tables where TABLESPACE_NAME like '%TBS_PORTAL%'; //以具体用户进入数据库 5. select segment_name from user_segmant where segmant_type='TBS_PORTAL'; desc dba_segmant; --查看当前用户每个表占用空间的大小: Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name; --查看每个表空间占用空间的大小: Select Tablespace_Name,Sum(bytes)/1024/1024 From Dba_Segments Group By Tablespace_Name --查看表占用的容量 select a.segment_name,a.BYTES /1024 /1024 as M from user_segments a where a.segment_type='TABLE' and a.TABLESPACE_NAME='TBS_PORTAL' order by M desc ; select a.segment_name,a.BYTES /1024 /1024 as M from user_segments a where a.segment_type='TABLE' order by M desc ; Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name;
3.oracle 删除表空间释放空间
SQL> alter table tb_im_req_msg enable row movement; Table altered. SQL> alter table tb_im_req_msg shrink space; Table altered.
4.oracle UNDO表空间
1)查看当前的undo表空间 Show parameter undo Show parameter undo_tablespace 2)显示数据库的所有UNDO表空间. SELECT tablespace_name FROM dba_tablespaces WHERE contents='UNDO'; 3)切换UNDO表空间. alter system set undo_tablespace=undotbs02 scope=both;