Confusion on how oracle works in SGA

Question

i did the following
Session 1
conn user/password
exec num(2000);/* this procedure generates numbers and inserts in a table on the xxx tablespace */
Plsql procedure completed
CommitCommit complete
     Session 2 /// this session is run simultaneously with session 1 using another terminal.
conn sys/<password> as sysdba
alter tablespace xxx offline normal
tablespace altered>
The problem is when the procedure is running I tried to turn the tablespace offline ..
But the tablespace gets offline and the procedure is still running . and also I have commited the trasaction when the tablespace is offline. The commit is successful. The commit should be unsuccessful bcos the tablespace is offline.
i am using oracle 10g R2 version on windows vista.
can anyone also give me any links or info on how oracle actually works when i give a DML query. like insert. or update..

Answer 1

but the procedure was still running when the
tablespace went offline normal.
How sure are you that the procedure was still successfully modifying the data ? It should have generated Oracle error ORA-00376: file N cannot be read at this time the moment the tablespace went off line.
Is the code short enough to post ? (If so, don't forget the "code" tags - see FAQ at top right - to get a fixed font display).
Is it not that dirty buffers are still being written
and the tablespace has gone offline!The session updating the data should fail as the tablespace status is changed, and the database writer will be triggered to write all the dirty blocks from that tablespace to file before the tablespace offline is completed.
>
Do you mean to say that there are still dirty buffers
belonging to the tablespace even after a checkpoint
and the tablespace being down!No.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
P.S. Here's a cut-n-paste from a SQL*Plus session running 10.2.0.1 as the tablespace holding table t1 - with one row in it - is taken offline a few moments after the pl/sql starts running:
SQL> insert into t1 values(1);
1 row created.
SQL> commit;
Commit complete.
SQL> get afiedt.buf
  1  begin
  2  for i in 1..1000000 loop
  3  update t1 set n1 = ln(i);
  4  end loop;
  5* end;
SQL> /
begin
ERROR at line 1:
ORA-00376: file 6 cannot be read at this time
ORA-01110: data file 6: 'C:\ORACLE\ORADATA\DXR2\TEST_8K.DBF'
ORA-06512: at line 3