We have been using temporary table to store intermediate results in pl/sql Stored procedure. Could anyone tell if there is a performance difference between doing bulk collect in
When we declare cursor explicitly, oracle will allocate a private SQL work area in our RAM. When you have select statement that returns multiple rows will be copied from table or view to private SQL work area as ACTIVE SET. Its size is the number of rows that meet your search criteria. Once cursor is opened, your pointer will be placed in the first row of ACTIVE SET. Here you can perform DML. For example if you perform some update operation. It will update any changes in rows in the work area and not in the table directly. So it is not using the table every time we need to update. It fetches once to the work area, then after performing operation, the update will be done once for all operations. This reduces input/output data transfer between database and user.