Oracle 11g - den mest effektive måde at indsætte flere rækker på

Du kan prøve indsættelse af direkte sti for at fremskynde driften, men for 100 poster skal konventionel stiindsættelse være hurtig nok, og det ser ud til, at problemet handler om tabellåsning, mens der indsættes i log fra et stort antal kilder.

For at instruere Oracle til at bruge direkte stiindsættelse skal du angive enten TILFØJ eller APPEND_VALUES hints afhængigt af insert statement-syntaks. F.eks.

insert /*+ APPEND */ 
into multi_insert(val_1, val_2)
select * from (
  select 100,    20 from dual union all
  select 21,      2 from dual union all
  select 321,    10 from dual union all
  select 22,     13 from dual union all
  select 14,    121 from dual union all
  select 11,    112 from dual union all
  select 112,    23 from dual union all
  select 132,  2323 from dual union all
  select 121,    34 from dual union all
  select 24333, 333 from dual union all
  select 1232, 3434 from dual union all
  select 4554, 3434 from dual union all
  select 3434,  211 from dual union all
  select 3434, 1233 from dual union all
  select 12,     22 from dual union all
  select 356,   233 from dual union all
  select 9347,   23 from dual union all
  select 8904,  245 from dual union all
  select 342,  4545 from dual union all
  select 453,   233 from dual
)

Hvis insert statement stammer fra PL/SQL-kode, kan du bruge bulk insert med forall statement for at forbedre ydeevnen (SQLFiddle ) :

declare
  type TRowList is table of multi_insert%rowtype index by binary_integer;

  vRowList TRowList;
  vRow     multi_insert%rowtype;
begin


  vRow.val_1 := 100;
  vRow.val_2 := 20;
  vRowList(0) := vRow;

  vRow.val_1 := 21;
  vRow.val_2 := 2;
  vRowList(1) := vRow;

  vRow.val_1 := 321;
  vRow.val_2 := 10;
  vRowList(2) := vRow;

  -- ...

  forall vIdx in vRowList.first .. vRowList.last
        insert /*+ APPEND_VALUES */  -- direct path insert
        into multi_insert values vRowList(vIdx);

end;