Calculating the size of each record in a table?

Question

Hi to all,
I trying to create histograms based on the unique record sizes in a particular table. However , in order to do that I need to calculate the size of each record in the table (in kilobytes preferably) and to get a list of unique record sizes.
Is there a function or easy way to calculate the size in Kbytes of a record in a table?
Thank you in advance!
Tony

Answer 1

Hi,
You can use the sum of the average of the vsizes of the fields in the table. For example:TEST.SQL>CREATE TABLE TEST
  2  (
  3  A VARCHAR2(50 CHAR),
  4  B NUMBER
  5  ) TABLESPACE TOOLS;
Table created.
TEST.SQL>INSERT INTO TEST VALUES('&1',&2);
Enter value for 1: A
Enter value for 2: 10
old   1: INSERT INTO TEST VALUES('&1',&2)
new   1: INSERT INTO TEST VALUES('A',10)
1 row created.
TEST.SQL>/
Enter value for 1: ABCDEFGHIJKLMNOPQRSTUVWXYZ
Enter value for 2: 100000
old   1: INSERT INTO TEST VALUES('&1',&2)
new   1: INSERT INTO TEST VALUES('ABCDEFGHIJKLMNOPQRSTUVWXYZ',100000)
1 row created.
TEST.SQL>COMMIT;
Commit complete.
TEST.SQL>SELECT AVG(VSIZE(A)) + AVG(vSIZE(B)) FROM TEST;
AVG(VSIZE(A))+AVG(VSIZE(B))
                       15.5                                  The average line size - from the data in the table NOW - is 15.5 bytes.
HTH,
Yoann.