如何检查 Oracle 数据库表空间

在 Oracle 数据库（新模式）中创建新用户时，需要验证现有表空间的可用性。此查询将向您显示那里有什么以及有多少空间可以免费使用。


 SELECT df.tablespace_name "Tablespace",
  totalusedspace "Used MB",
  (df.totalspace - tu.totalusedspace) "Free MB",
  df.totalspace "Total MB",
  ROUND(100 * ( (df.totalspace - tu.totalusedspace)/ df.totalspace)) "% Free"
FROM
  (SELECT tablespace_name,
    ROUND(SUM(bytes) / 1048576) TotalSpace
  FROM dba_data_files
  GROUP BY tablespace_name
  ) df,
  (SELECT ROUND(SUM(bytes)/(1024*1024)) totalusedspace,
    tablespace_name
  FROM dba_segments
  GROUP BY tablespace_name
  ) tu
WHERE df.tablespace_name = tu.tablespace_name;

此外，此查询将显示表空间文件所在的位置：


 SELECT df.tablespace_name "Tablespace",
  totalusedspace "Used MB",
  (df.totalspace - tu.totalusedspace) "Free MB",
  df.totalspace "Total MB",
  ROUND(100 * ( (df.totalspace - tu.totalusedspace)/ df.totalspace)) "% Free"
FROM
  (SELECT tablespace_name,
    ROUND(SUM(bytes) / 1048576) TotalSpace
  FROM dba_data_files
  GROUP BY tablespace_name
  ) df,
  (SELECT ROUND(SUM(bytes)/(1024*1024)) totalusedspace,
    tablespace_name
  FROM dba_segments
  GROUP BY tablespace_name
  ) tu
WHERE df.tablespace_name = tu.tablespace_name;

以下是有关 Oracle 如何管理用户、模式和表空间的一些参考资料。

https://community.oracle.com/message/1832920 http://docs.oracle.com/cd/B28359_01/server.111/b28310/tspaces014.htm#ADMIN11412

http://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_8003.htm

http://stackoverflow.com/questions/880230/difference-between-a-user-and-a-schema-in-oracle

https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:6162110256950

如何检查 Oracle 数据库表空间

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