Tables size every week

Question

Dear all,
i got a situation to generate report for all tables in an schema for size in Bytes, and need to caluclate todays size with last week size and put the results in an excel. i have over 30,000 tables in that scheme.
i though of creating a new table with necessary columns (like ... tablename, tablespace, owner, lastweek size, this week size, difference). and running a procedure every monday to load data into table.
please let me now if my apporach is right, and guide me inthis.
Thanks

Answer 1

Hi,
user9284645 wrote:
if i use the LAG/LEAD it will use the data of the same column (i.e the size of the above table, not previous week size of the same table), please correct me if i am wrong.If you only have one size column, then you will want to use the same column from the table to populate both the this_week_size and last_week_siize columns of the output.
For example:
CREATE TABLE     table_size
(       table_name     VARCHAR2 (30)
,     count_date     DATE
,     num_rows     NUMBER (12)
INSERT INTO table_size (table_name, count_date, num_rows) VALUES ('DEPT', DATE '2011-09-26',  4);
INSERT INTO table_size (table_name, count_date, num_rows) VALUES ('EMP',  DATE '2011-09-26', 14);
INSERT INTO table_size (table_name, count_date, num_rows) VALUES ('DEPT', DATE '2011-10-03',  4);
INSERT INTO table_size (table_name, count_date, num_rows) VALUES ('EMP',  DATE '2011-10-03', 16);
SELECT    table_name
,         count_date
,         num_rows               AS this_week_size
,         LAG (num_rows) OVER ( PARTITION BY  table_name
                                       ORDER BY      count_date
                     )          AS last_week_size
FROM      table_size
ORDER BY  table_name
,            count_date
;Output:
TABLE_NAME COUNT_DATE  THIS_WEEK_SIZE LAST_WEEK_SIZE
DEPT       26-Sep-2011              4
DEPT       03-Oct-2011              4              4
EMP        26-Sep-2011             14
EMP        03-Oct-2011             16             14Try adding more data, for the same tables but different weeks. See how the results change to include the new data.
Edited by: Frank Kulash on Oct 3, 2011 4:25 PM