Stephane,
I don't understand what you mean when you say you can
select on t1 before any commit.
I just tried this on an 8.1.7 database, and there was
a signicant reduction in redo. There was only 668
bytes of redo generated vs. 2320 (see below). I think
some redo will still be generated as you allocate
extents (my tablespace is dictionary managed).
Rob Pegram
Oracle Certified DBA
----------------------------------------------------
SQL> create table t as select * from dba_users;
Table created.
SQL> alter table t nologging;
Table altered.
SQL> delete from t;
15 rows deleted.
SQL> commit;
Commit complete.
SQL> select value
from v$mystat, v$statname
where v$mystat.statistic# = v$statname.statistic#
and v$statname.name = 'redo size'
VALUE
----------
117720
SQL> insert /*+ append */ into t as select * from
dba_users;
insert /*+ append */ into t as select * from dba_users
*
ERROR at line 1:
ORA-00926: missing VALUES keyword
SQL> insert /*+ append */ into t select * from
dba_users;
15 rows created.
SQL> commit;
Commit complete.
SQL> select value
from v$mystat, v$statname
where v$mystat.statistic# = v$statname.statistic#
and v$statname.name = 'redo size'
VALUE
----------
118388
SQL> delete from t;
15 rows deleted.
SQL>
SQL> commit;
Commit complete.
SQL> select value
from v$mystat, v$statname
where v$mystat.statistic# = v$statname.statistic#
and v$statname.name = 'redo size'
VALUE
----------
123856
SQL> insert into t select * from dba_users;
15 rows created.
SQL> commit;
Commit complete.
SQL> select value
from v$mystat, v$statname
where v$mystat.statistic# = v$statname.statistic#
and v$statname.name = 'redo size'
VALUE
----------
126176
--- paquette stephane <[EMAIL PROTECTED]>
wrote:
> Hi,
>
> I'm trying the following insert /*+ append */ into
> t1
> as select * from t2;
>
> t1 is created with nologging attribute.
>
> The insert is not using the hint at all.
> I can select on t1 (before any commit) which I
> should
> not be able to do if the append hint was used.
>
> Any ways to get the hing used ?
> (Oracle 817/NT)
>
> TIA
>
> =====
> Stéphane Paquette
> DBA Oracle, consultant entrepôt de données
> Oracle DBA, datawarehouse consultant
> [EMAIL PROTECTED]
>
>
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