监控并记录Oracle数据库空间增长的简单方法

1.跟踪数据库空间增长

SELECT SUM(MB_ALLOC)/1024 GB_DB_SIZE FROM
(SELECT SUM(ROUND(bytes_used/(1024*1024),2) + ROUND(bytes_free/(1024*1024),2)) MB_ALLOC
FROM V$temp_space_header, dba_temp_files
WHERE V$temp_space_header.file_id (+) = dba_temp_files.file_id
UNION
SELECT SUM(BYTES)/(1024*1024) MB_ALLOC FROM dba_data_files);

2.下面例子除了undo和temp表空间外，将其他表空间的的使用情况记录每周插入db_spaec_hist表，以便查询：

Create the table for database size history create table db_space_hist (
 timestamp    date,
 total_space  number(8),
 used_space   number(8),
 free_space   number(8),
        pct_inuse    number(5,2),
        num_db_files number(5)
);

Create the procedure db_space_history CREATE OR REPLACE PROCEDURE db_space_history AS
BEGIN
   INSERT INTO db_space_hist
 SELECT SYSDATE, total_space,
        total_space-NVL(free_space,0) used_space,
        NVL(free_space,0) free_space,
        ((total_space - NVL(free_space,0)) / total_space)*100 pct_inuse,
        num_db_files
 FROM ( SELECT SUM(bytes)/1024/1024 free_space
        FROM   sys.DBA_FREE_SPACE WHERE tablespace_name NOT LIKE '%UNDO%') FREE,
      ( SELECT SUM(bytes)/1024/1024 total_space,
               COUNT(*) num_db_files
        FROM   sys.DBA_DATA_FILES WHERE tablespace_name NOT LIKE '%UNDO%') FULL;
   COMMIT;
END;
/

Create the job that runs once in a week DECLARE
  X NUMBER;
BEGIN
  SYS.DBMS_JOB.SUBMIT
    (
      job        => X
     ,what       => 'SYS.DB_SPACE_HISTORY;'
     ,next_date  => TO_DATE('22/02/2008 19:40:28','dd/mm/yyyy hh24:mi:ss')
     ,INTERVAL   => 'TRUNC(SYSDATE+7)'
     ,no_parse   => FALSE
    );
END;

3.做周期性监控

select * from db_space_hist order by timestamp desc;

4.查询结果（每月数据库的增长情况），统计的出发条件为createion_time.

SELECT TO_CHAR(creation_time, 'RRRR Month') "Month", round(SUM(bytes)/1024/1024/1024) "Growth in GBytes"
FROM sys.v_$datafile
WHERE creation_time > SYSDATE-365
GROUP BY TO_CHAR(creation_time, 'RRRR Month');

Month          Growth in GBytes
-------------- ----------------
2008 December              1331
2008 November               779
2008 October                447
2009 April                  797
2009 August                 344
2009 February               505
2009 January                443
2009 July                   358
2009 June                   650
2009 March                  452
2009 May                   1787
2009 October                255
2009 September              158