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

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Oracle PL / SQL » SQL Plus » Session variable

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>

Related examples in the same category

1.	alter the session with the ALTER SESSION statement and set the session's time zone forward
2.	alter session set nls_date_format = 'dd-MON-yyyy hh24:mi:ss';
3.	alter session set OPTIMIZER_MODE = RULE
4.	Adjust your session time zone to -08:00, display the contents of your time table.
5.	alter session set cursor_sharing = force
6.	alter session set use_stored_outlines
7.	Event-based call and exception tracing
8.	event-based call and exception tracing.
9.	SQL trace
10.	uses dynamic SQL to issue an ALTER SESSION statement.
11.	ALTER SESSION SET QUERY_REWRITE_ENABLED
12.	alter session set sql_trace=true
13.	sql_trace a stored procedure
14.	Set the following session parameters to enable query rewrite:
15.	If your session time zone is not US/Central (-06:00), alter your session to Central time:
16.	alter session set nls_date_format = 'DD-MON-YYYY HH24:MI:SS'
17.	Alter time_zone
18.	sessiontimezone, current_timestamp
19.	demonstrates the use of DBMS_SQL to execute an ALTER SESSION statement.
20.	interaction between ALTER SESSION and autonomous transactions.
21.	ALTER SESSION SET SQL_TRACE = TRUE
22.	ALTER SESSION SET optimizer_dynamic_sampling
23.	alter session set NLS_DATE_FORMAT='DD-MM-YYYY'
24.	alter session set current_schema=Smart
25.	alter session set hash_area_size
26.	alter session set nls_date_format='dd-mm-yyyy', nls_language=Dutch, nls_currency='Eur'
27.	alter session set optimizer_index_cost_adj, alter session set optimizer_index_caching
28.	alter session set optimizer_max_permutations=80000
29.	alter session set optimizer_mode=all_rows
30.	alter session set optimizer_mode=first_rows
31.	alter session set query_rewrite_integrity=enforced
32.	alter session set sort_area_size = 102400000
33.	alter session set workarea_size_policy=manual
34.	alter system flush shared_pool
35.	alter system quiesce restricted
36.	alter system resume
37.	alter system suspend
38.	set optimizer_features_enable = '8.1.5' scope = spfile
39.	show filestat
40.	show parameter optimizer_features
41.	show verify
42.	If your session time zone is not US/Central Standard Time (-06:00), alter your session to Central Standard time:

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