SQL*Plus: compute sum of tablespaces; incorrect figures

Question

Hi,
I wonder if someone would be interested in checking the below script.
It is from Darl Kuhn's book 'Pro Oracle Database 11g Administration' (page 81) , and the code can be freely
downloaded from Apress' website, so I guess it's OK to post it here. I assume it's a standard script most DBA's have, anyway.
SET PAGESIZE 300 LINES 132 ECHO OFF VERIFY OFF FEEDB OFF SPACE 1 TRIMSP ON
COMPUTE SUM OF a_byt t_byt f_byt ON REPORT
BREAK ON REPORT ON tablespace_name ON pf
COL tablespace_name FOR A17   TRU HEAD 'Tablespace|Name'
COL file_name       FOR A40   TRU HEAD 'Filename'
COL a_byt           FOR 9,990.999 HEAD 'Allocated|GB'
COL t_byt           FOR 9,990.999 HEAD 'Current|Used GB'
COL f_byt           FOR 9,990.999 HEAD 'Current|Free GB'
COL pct_free        FOR 990.0     HEAD 'File %|Free'
COL pf              FOR 990.0     HEAD 'Tbsp %|Free'
COL seq NOPRINT
DEFINE b_div=1073741824
select * from (
SELECT 1 seq, b.tablespace_name, nvl(x.fs,0)/y.ap*100 pf, b.file_name file_name,
  b.bytes/&&b_div a_byt, NVL((b.bytes-SUM(f.bytes))/&&b_div,b.bytes/&&b_div) t_byt,
  NVL(SUM(f.bytes)/&&b_div,0) f_byt, NVL(SUM(f.bytes)/b.bytes*100,0) pct_free
FROM dba_free_space f, dba_data_files b
,(SELECT y.tablespace_name, SUM(y.bytes) fs
   FROM dba_free_space y GROUP BY y.tablespace_name) x
,(SELECT x.tablespace_name, SUM(x.bytes) ap
   FROM dba_data_files x GROUP BY x.tablespace_name) y
WHERE f.file_id(+) = b.file_id
AND   x.tablespace_name(+) = y.tablespace_name
and   y.tablespace_name =  b.tablespace_name
AND   f.tablespace_name(+) = b.tablespace_name
GROUP BY b.tablespace_name, nvl(x.fs,0)/y.ap*100, b.file_name, b.bytes
UNION
SELECT 2 seq, tablespace_name,
  j.bf/k.bb*100 pf, b.name file_name, b.bytes/&&b_div a_byt,
  a.bytes_used/&&b_div t_byt, a.bytes_free/&&b_div f_byt,
  a.bytes_free/b.bytes*100 pct_free
FROM v$temp_space_header a, v$tempfile b
  ,(SELECT SUM(bytes_free) bf FROM v$temp_space_header) j
  ,(SELECT SUM(bytes) bb FROM v$tempfile) k
WHERE a.file_id = b.file#
ORDER BY 1,2,4,3);The thing is, if I run this on our production database (Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi)
I get individually correct rows, but the sumline is incorrect:
Tablespace        Tbsp %                                           Allocated    Current    Current File %
Name                Free Filename                                         GB    Used GB    Free GB   Free
plenty of rows like this here...
SCDAT               12.4 /oracle/SCDT/data/SCDT/c_scdat01.dbf         10.000      8.944      1.056   10.6
                         /oracle/SCDT/data/SCDT/c_scdat02.dbf         10.000      8.875      1.125   11.3
                         /oracle/SCDT/data/SCDT/c_scdat03.dbf         10.000      8.820      1.180   11.8
                         /oracle/SCDT/data/SCDT/c_scdat04.dbf         10.000      8.819      1.181   11.8
                         /oracle/SCDT/data/SCDT/c_scdat05.dbf         10.000      8.787      1.213   12.1
                         /oracle/SCDT/data/SCDT/c_scdat06.dbf         10.000      8.792      1.208   12.1
                         /oracle/SCDT/data/SCDT/c_scdat07.dbf         10.000      8.508      1.492   14.9
then the summing row shows (for AllocatedGB, CurrentGB and CurrentFreeGB)
                                                                 1,155.000     858     179The thing is that this isn't correct. Firstly; current free isn't equal to allocated - currently used.
Secondly, if I sum all the rows in a spreadsheet, they are
1171.668 931.897 239.758
Do you get similiar results, i.e. the script sums incorrectly?
If yes, can anybody spot the error? I can't..
Thanks very much!

Answer 1

Slow_moe wrote:
Tablespace        Tbsp %                                           Allocated    Current    Current File %
Name                Free Filename                                         GB    Used GB    Free GB   Free
plenty of rows like this here...
SCDAT               12.4 /oracle/SCDT/data/SCDT/c_scdat01.dbf         10.000      8.944      1.056   10.6
/oracle/SCDT/data/SCDT/c_scdat02.dbf         10.000      8.875      1.125   11.3
/oracle/SCDT/data/SCDT/c_scdat03.dbf         10.000      8.820      1.180   11.8
/oracle/SCDT/data/SCDT/c_scdat04.dbf         10.000      8.819      1.181   11.8
/oracle/SCDT/data/SCDT/c_scdat05.dbf         10.000      8.787      1.213   12.1
/oracle/SCDT/data/SCDT/c_scdat06.dbf         10.000      8.792      1.208   12.1
/oracle/SCDT/data/SCDT/c_scdat07.dbf         10.000      8.508      1.492   14.9
then the summing row shows (for AllocatedGB, CurrentGB and CurrentFreeGB)
1,155.000     858     179The thing is that this isn't correct. Firstly; current free isn't equal to allocated - currently used.Looks like it is to me, and I just worked it out in my head.
Secondly, if I sum all the rows in a spreadsheet, they are
1171.668 931.897 239.758How do you know the spreadsheet is right and hasn't rounded up/down some figures?