Sorry, don't understand the DBA part ( #2 ).
| "Binley Lim" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED] 11/14/2003 02:09 PM
|
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> cc: Subject: Re: SQL Query |
Would have thought:
1. A developer would have known this - a SQL many-to-many join
2. A DBA would have known this - how else would you know what's happening with your tablespaces? (Clickety-pointy answers not allowed)
----- Original Message -----
From: [EMAIL PROTECTED]
To: Multiple recipients of list ORACLE-L
Sent: Saturday, November 15, 2003 9:54 AM
Subject: Re: SQL Query
You can't join DBA_EXTENTS and DBA_DATA_FILES based on an
equality of tablespace_name, and then add up the bytes of the files
for the tablespace.
ie.
select
b.tablespace_name,
b.bytes
from dba_extents a, dba_data_files b
where a.tablespace_name=b.tablespace_name
Try running that query, and it may become clear.
Your first query correctly aggregates the file sizes.
The second query determines tablespace size based
on the number of extents allocated to it.
Drop all the objects in the tablespace, and your tablespace
will no longer appear to have any space.
HTH
Jared
| "Bellow, Bambi" <[EMAIL PROTECTED]> Sent by: [EMAIL PROTECTED] 11/14/2003 09:44 AM | To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> cc: Subject: SQL Query |
Friends --
Why would these two queries return different results?
This query works.
SQL> l
1 select
a.tablespace_name,megs_allocated,megs_used,round(megs_used/b.megs_allocated,
2)*100 pct
2 from (select tablespace_name,sum(bytes)/(1024*1024) megs_used
3 from dba_extents group by tablespace_name) a,
4 (select tablespace_name,sum(bytes)/(1024*1024) megs_allocated
5 from dba_data_files group by tablespace_name) b
6 where a.tablespace_name=b.tablespace_name
7* and a.tablespace_name='NAUAT'
SQL> /
TABLESPACE_NAME MEGS_ALLOCATED MEGS_USED PCT
------------------------------ -------------- ---------- ----------
NAUAT 22924.25 11509 50
This query does not work
1 select a.tablespace_name,sum(b.bytes)/(1024*1024) megs_allocated,
2 sum(a.bytes)/(1024*1024) megs_used,
3 round(sum(a.bytes)/sum(b.bytes),4)*100 pct
4 from dba_extents a, dba_data_files b
5 where a.tablespace_name=b.tablespace_name
6 and a.tablespace_name='NAUAT'
7* group by a.tablespace_name,b.tablespace_name
SQL> /
TABLESPACE_NAME MEGS_ALLOCATED MEGS_USED PCT
------------------------------ -------------- ---------- ----------
NAUAT 31773010.5 23018 .07
Bambi.
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Author: Bellow, Bambi
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