C基础

数据库表空间排查及扩容

1. 通过以下SQL去用ORACLE的SYS用户查询相关表空间使用情况：

SELECT d.tablespace_name "Name", d.status "Status", 
       TO_CHAR (NVL (a.BYTES / 1024 / 1024, 0), '99,999,990.90') "Size (M)",
          TO_CHAR (NVL (a.BYTES - NVL (f.BYTES, 0), 0) / 1024 / 1024,
                   '99999999.99'
                  ) USE,
       TO_CHAR (NVL ((a.BYTES - NVL (f.BYTES, 0)) / a.BYTES * 100, 0),
                '990.00'
               ) "Used %"
  FROM SYS.dba_tablespaces d,
       (SELECT   tablespace_name, SUM (BYTES) BYTES
            FROM dba_data_files
        GROUP BY tablespace_name) a,
       (SELECT   tablespace_name, SUM (BYTES) BYTES
            FROM dba_free_space
        GROUP BY tablespace_name) f
 WHERE d.tablespace_name = a.tablespace_name(+)
   AND d.tablespace_name = f.tablespace_name(+)
   AND NOT (d.extent_management LIKE 'LOCAL' AND d.CONTENTS LIKE 'TEMPORARY')
UNION ALL
SELECT d.tablespace_name "Name", d.status "Status", 
       TO_CHAR (NVL (a.BYTES / 1024 / 1024, 0), '99,999,990.90') "Size (M)",
          TO_CHAR (NVL (t.BYTES, 0) / 1024 / 1024, '99999999.99') USE,
       TO_CHAR (NVL (t.BYTES / a.BYTES * 100, 0), '990.00') "Used %"
  FROM SYS.dba_tablespaces d,
       (SELECT   tablespace_name, SUM (BYTES) BYTES
            FROM dba_temp_files
        GROUP BY tablespace_name) a,
       (SELECT   tablespace_name, SUM (bytes_cached) BYTES
            FROM v$temp_extent_pool
        GROUP BY tablespace_name) t
 WHERE d.tablespace_name = a.tablespace_name(+)
   AND d.tablespace_name = t.tablespace_name(+)
   AND d.extent_management LIKE 'LOCAL'
   AND d.CONTENTS LIKE 'TEMPORARY';

查询结果如下图：

查询表空间已经占用99%以上。

2. 查询是否还有自动扩展的表空间文件

SELECT 
    TABLESPACE_NAME, FILE_NAME, BYTES/1024/1024 "CURR_SIZE(MB)", MAXBYTES/1024/1024 "MAX_SIZE(MB)",AUTOEXTENSIBLE 
FROM 
    -- DBA_DATA_FILES;
    -- DBA_TEMP_FILES;
    -- TEMP为临时表空间查询

查询结果如下图：

3. 增加表空间文件

如果发现已无自动扩展文件可用需要增减表空间文件：

-- 增加表空间文件
ALTER TABLESPACE "<table_space_name>" ADD DATAFILE '+DG_ORA_DB/<filename>.dbf' SIZE 8G;
-- 如果增加的为temp表空间，请讲DATAFILE改为TEMPFILE

4. 修改增加后的表空间文件

增加表空间成功以后，修改文件为自动扩展：

alter database DATAFILE '+DG_ORA_DB/<filename>.dbf' autoextend on next 128M maxsize 31G;
-- 如果修改的为temp表空间，请讲DATAFILE改为TEMPFILE

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