oracle 扩展表空间

kevin_cat2026-03-31 20:14

ALTER TABLESPACE ZYMES ADD DATAFILE '/u02/CDB/mesdb/ZYMES08.dbf' SIZE 10G AUTOEXTEND ON NEXT 1G MAXSIZE 32G;

1.查询表空间大小

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SELECT df.tablespace_name,
       ROUND(df.total_mb, 2) AS total_mb,
       ROUND(df.total_mb - NVL(fs.free_mb, 0), 2) AS used_mb,
       ROUND(NVL(fs.free_mb, 0), 2) AS free_mb,
       ROUND((df.total_mb - NVL(fs.free_mb, 0)) / df.total_mb * 100, 2) AS pct_used
FROM (SELECT tablespace_name, SUM(bytes) / 1024 / 1024 AS total_mb
      FROM dba_data_files
      GROUP BY tablespace_name) df
LEFT JOIN (SELECT tablespace_name, SUM(bytes) / 1024 / 1024 AS free_mb
           FROM dba_free_space
           GROUP BY tablespace_name) fs
    ON df.tablespace_name = fs.tablespace_name
ORDER BY pct_used DESC;

2查询数据文件容量情况

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SELECT
    df.file_id,
    df.file_name,
    df.tablespace_name,
    ROUND(df.bytes / 1024 / 1024, 2) AS total_mb,
    ROUND(NVL(fs.free_bytes, 0) / 1024 / 1024, 2) AS free_mb,
    ROUND((df.bytes - NVL(fs.free_bytes, 0)) / 1024 / 1024, 2) AS used_mb,
    df.autoextensible,
    ROUND(df.maxbytes / 1024 / 1024, 2) AS max_mb
FROM
    dba_data_files df,
    (SELECT file_id, SUM(bytes) AS free_bytes
     FROM dba_free_space
     GROUP BY file_id) fs
WHERE
    df.file_id = fs.file_id(+)
    AND df.tablespace_name = 'ZYMES'
ORDER BY
    df.file_id;

3立即添加新的数据文件（最直接有效）

立即添加新的数据文件（最直接有效）

因为前 5 个大文件已经无法扩展，必须通过增加新文件来提升表空间总容量。建议至少添加 1~2 个 32GB 的文件：

sql
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-- 添加第一个新文件
ALTER TABLESPACE ZYMES ADD DATAFILE '/u02/CDB/mesdb/ZYMES08.dbf' SIZE 10G AUTOEXTEND ON NEXT 1G MAXSIZE 32G;

-- 如果空间仍紧张，再添加第二个
ALTER TABLESPACE ZYMES ADD DATAFILE '/u02/CDB/mesdb/ZYMES09.dbf' SIZE 10G AUTOEXTEND ON NEXT 1G MAXSIZE 32G;

4验证磁盘空间大小 df -h /u02