Update query using FORALL statement

Question

Hi ALL,
I have two tables Table: Mater_A(20 Cloumns) and Temp_A(20 Columns).
Both are almost identical. The Master_A is master table that has to be updated daily based on the temporary table Temp_A.
Everyday , i expect around 100000 records(same records with modified valus ) in Temp_A that has to be updated in Master_A. So i have to make the query as optimized as possible.
For this,I have created a cursor that has all records from table Temp_A.
Then i am using FORALL statement to update the data. But it throws exception something like that:
Error: PLS-00436: implementation restriction: cannot reference fields of BULK In-BIND table of records
Error: PLS-00382: expression is of wrong type
It states that i have to create a separate type for each column that i want to update.
I have created procedure like this:
Open C_Temp_A;
Loop
Fetch C_Temp_A Bulk Collect into v_C_Temp_A limit 5000;
Exit When C_Temp_A%NOTFOUND;
Begin
ForAll i in v_C_Temp_A.first.. v_C_Temp_A.Last
Update Master_A mst Set mst.Column2= v_C_Temp_A(i).t_Column2,
mst.Column3= v_C_Temp_A(i).t_Column3,mst.Column4= v_C_Temp_A(i).t_Column4........to all columns
where mst.Column1= v_C_Temp_A(i).t_Column1;
End;
End Loop;
Close C_Temp_A;
Please help me to solve this or suggest me any other alternative to reduce the processing time.

Answer 1

Why cant you use like :(Or I misread?)
SQL> select * from a;
        ID         C2
         1        100
SQL> select * from b;
        ID         C2
         1       1000
SQL> merge into b
  2  using(select * from a) a
  3  on (b.id = a.id)
  4  when matched then
  5   update
  6   set b.c2 = a.c2;
1 row merged.
SQL> select * from b;
        ID         C2
         1        100