Oracle tables growth

Question

Hi Gurus,
i have one question , is there any way we can track the history of tables growth. For example table A,B,C were created at the time of database creation in schema "ricky" . how we can track the tables growth in the form of report. Lets say we want to see the growth of this table after 2 years, as such we can refer some customized script that can report weekly or monthly growth of this table in those 2 years. The reason i am asking is in order to plan the purging policy.
Any help would me much appreciated
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
Edited by: 821269 on 25-Mar-2011 4:20 PM

Answer 1

Hi, welcome to the forum.
>
is there any way we can track the history of tables growth
>
Automatically by Oracle, No.
Manually, doing by yourself. Yes.
You can create a table where you can store the information you want like this (as an example).
CREATE TABLE TABLES_SIZE_HIST (
  SNAP_DATE        DATE,
  SNAP_TYPE        CHAR(1), --you can put D=Daily, W=Weekly etc
  OWNER              VARCHAR2(30),
  SEGMENT_TYPE  VARCHAR2(30),
  SEGMENT_NAME  VARCHAR2(30),
  SEGMENT_BYTES NUMBER)
/So, periodically you can insert data into the table above with this statement (only as example, you can insert data into the table in many ways).
INSERT INTO TABLES_SIZE_HIST
SELECT sysdate, 'W', s.owner, s.segment_type, s.segment_name, s.bytes
   FROM dba_segments s
      WHERE s.owner = '<OWNER>'
          AND s.segment_type = '<TABLE>'
          AND s.segment_name IN ('<TABLE1>', '<TABLE2>',.....,'<TABLE+n+>')
/So, the query above you can put it into an Oracle Job or into a Cron Job (unix) for say something.
After your period of 2 years, you can query the data collected and make desitions.
You have to be carefull because maybe you can have lot of data in your table. So, you have to find the best scenario for storage.
Obviously, depends of the period that you make the snapshot, daily, weekly, twice a day etc etc.
HTH
johnxjean