Oracle数据库表空间维护

--计算表空间使用情况
 SELECT UPPER(F.TABLESPACE_NAME) "HJ",
       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 4 DESC;

--表空间占比

SELECT a.tablespace_name, round((total - free) / total, 4) * 100 "使用率%"
FROM (SELECT tablespace_name, SUM(bytes) free FROM dba_free_space GROUP BY tablespace_name) a,
(SELECT tablespace_name, SUM(bytes) total FROM dba_data_files GROUP BY tablespace_name) b
WHERE a.tablespace_name = b.tablespace_name;

--给表空间扩容

ALTER DATABASE DATAFILE 'E:\app\Lenovo\product\11.2.0\dbhome_1\database\HJ.dbf' RESIZE 28250M;

--Oracle导入时包含空表导出的sql生成
select 'alter table ' ||table_name ||' allocate extent;' from user_tables where segment_created='NO';