Update more than one lakh records

Question

Hi i have a table which contains around 1 million records when the end user want to update a record of more than one lakh what could be the best process to get the updation quickly the current scenario is taking 1mnt for 10k records,thanks in advance

Answer 1

SQL> drop table t;
Table dropped.
SQL>
SQL> create table t
  2  as
  3  select rownum col1
  4  from   dual
  5  connect by rownum <= 10000;
Table created.
SQL>
SQL> create index i1 on t (col1);
Index created.
SQL>
SQL> select n.name, m.value
  2  from   v$mystat m, v$statname n
  3  where  m.statistic# = n.statistic#
  4  and    name = 'redo size';
NAME                                                                  VALUE
redo size                                                          39009532
SQL>
SQL> update t set col1 = 56789;
10000 rows updated.
SQL>
SQL> commit;
Commit complete.
SQL>
SQL> select n.name, m.value
  2  from   v$mystat m, v$statname n
  3  where  m.statistic# = n.statistic#
  4  and    name = 'redo size';
NAME                                                                  VALUE
redo size                                                          46229748
SQL>
SQL> drop table t;
Table dropped.
SQL>
SQL> create table t
  2  as
  3  select rownum col1
  4  from   dual
  5  connect by rownum <= 10000;
Table created.
SQL>
SQL> create index i1 on t (col1);
Index created.
SQL>
SQL> alter index i1 nologging;
Index altered.
SQL>
SQL> select n.name, m.value
  2  from   v$mystat m, v$statname n
  3  where  m.statistic# = n.statistic#
  4  and    name = 'redo size';
NAME                                                                  VALUE
redo size                                                          46295228
SQL>
SQL> update t set col1 = 56789;
10000 rows updated.
SQL>
SQL> commit;
Commit complete.
SQL>
SQL> select n.name, m.value
  2  from   v$mystat m, v$statname n
  3  where  m.statistic# = n.statistic#
  4  and    name = 'redo size';
NAME                                                                  VALUE
redo size                                                          53515540
SQL> select 46229748-39009532, 53515540-46295228 from dual;
46229748-39009532 53515540-46295228
          7220216           7220312
SQL>