Forcing data to be writen from buffer to datafile

Question

HI,
Could someone help me with the following, (using oracle 11g r2)
If I conduct an experiment that updates a row in a table lets say the row has a column called 'test' and I update the value of test from 'a' to 'b'
I then run another update and change 'b' back to 'a'
I then repeat the process 2000 times
Am I right in thinkin that this update will be carried by ammending the data in the buffer cache only? it will have nothing to do with the write speeds of the disk?
how can I force the updata to be writen to disk each time?
any help would be appriciated

Answer 1

Maris Elsins wrote:
For the recoverability purposes each commit makes sure changes are written to the redo logsChanges are written to redo logs when they happen regardless you commit or not later:
SQL> create table t1(x number);
Table created.
SQL> select
  2    n.name, t.value
  3  from
  4    v$mystat   t join
  5    v$statname n
  6  on
  7    t.statistic# = n.statistic#
  8  where
  9    n.name = 'redo size';
NAME                      VALUE
redo size                119764
SQL> insert into t1 select level from dual connect by level <= 100000;
100000 rows created.
SQL> select
  2    n.name, t.value
  3  from
  4    v$mystat   t join
  5    v$statname n
  6  on
  7    t.statistic# = n.statistic#
  8  where
  9    n.name = 'redo size';
NAME                      VALUE
redo size               1733608
SQL> rollback;
Rollback complete.
SQL> select
  2    n.name, t.value
  3  from
  4    v$mystat   t join
  5    v$statname n
  6  on
  7    t.statistic# = n.statistic#
  8  where
  9    n.name = 'redo size';
NAME                      VALUE
redo size               2050424
SQL>  SY.