alter session set db_file_multiblock_read_count

    

SQL> create table myTable
  2  as
  3  select rownum id, a.*
  4    from all_objects a
  5   where 1=0
  6  /
SQL>
SQL>
SQL>
SQL> set autotrace traceonly explain
SQL> select * from myTable;

Execution Plan
----------------------------------------------------------
Plan hash value: 1015944200

-------------------------------------
| Id  | Operation         | Name    |
-------------------------------------
|   0 | SELECT STATEMENT  |         |
|   1 |  TABLE ACCESS FULL| MYTABLE |
-------------------------------------

Note
-----
   - rule based optimizer used (consider using cbo)

SQL>
SQL> alter session set db_file_multiblock_read_count = 32;
SQL>
SQL> select * from myTable;

Execution Plan
----------------------------------------------------------
Plan hash value: 1015944200

-------------------------------------
| Id  | Operation         | Name    |
-------------------------------------
|   0 | SELECT STATEMENT  |         |
|   1 |  TABLE ACCESS FULL| MYTABLE |
-------------------------------------

Note
-----
   - rule based optimizer used (consider using cbo)

SQL>
SQL> alter session set db_file_multiblock_read_count = 64;
SQL>
SQL> select * from myTable;

Execution Plan
----------------------------------------------------------
Plan hash value: 1015944200

-------------------------------------
| Id  | Operation         | Name    |
-------------------------------------
|   0 | SELECT STATEMENT  |         |
|   1 |  TABLE ACCESS FULL| MYTABLE |
-------------------------------------

Note
-----
   - rule based optimizer used (consider using cbo)

SQL>
SQL>
SQL> set autotrace off
SQL>
SQL>
SQL> drop table myTable;
SQL>
SQL>

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alter session set db_file_multiblock_read_count : Session variable « SQL Plus « Oracle PL / SQL

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