db_file_multiblock_read_count and Oracle IO size

摘要: db_file_multiblock_read_count的设置要受OS最大IO能力影响，也就是说，如果你系统的硬件IO能力有限，即使设置再大的db_file_multiblock_read_count也是没有用的

初始化参数db_file_multiblock_read_count 影响Oracle在执行全表扫描时一次读取的block的数量.

db_file_multiblock_read_count的设置要受OS最大IO能力影响，也就是说，如果你系统的硬件IO能力有限，即使设置再大的db_file_multiblock_read_count也是没有用的。

理论上，最大db_file_multiblock_read_count和系统IO能力应该有如下关系:

Max(db_file_multiblock_read_count) = MaxOsIOsize/db_block_size

当然这个Max(db_file_multiblock_read_count)还要受Oracle的限制，
目前Oracle所支持的最大db_file_multiblock_read_count 值为128.

我们可以通过db_file_multiblock_read_count来测试Oracle在不同系统下，单次IO最大所能读取得数据量：

我们可以看到，在以上测试平台中，Oracle最多每次IO能够读取128个Block，由于block_size为8k,也就是每次最多读取了1M数据.

$ sqlplus "/ as sysdba"

SQL*Plus: Release 10.1.0.2.0 - Production on Wed Aug 11 23:43:52 2004

Copyright (c) 1982, 2004, Oracle.  All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options

SYS AS SYSDBA on 11-AUG-04 >show parameter read_count

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_multiblock_read_count        integer     16

SYS AS SYSDBA on 11-AUG-04 >create tablespace dfmbrc
2  datafile '/opt/oracle/oradata/JAVIS/dfmbrc.dbf'
3  size 20M extent management local uniform size 2M;

Tablespace created.

SYS AS SYSDBA on 11-AUG-04 >create table t tablespace dfmbrc as select * from dba_objects;

Table created.

SYS AS SYSDBA on 11-AUG-04 >insert into t select * from t;

9149 rows created.

SYS AS SYSDBA on 11-AUG-04 >/

18298 rows created.

SYS AS SYSDBA on 11-AUG-04 >/

36596 rows created.

SYS AS SYSDBA on 11-AUG-04 >commit;

Commit complete.

SYS AS SYSDBA on 11-AUG-04 >alter session set db_file_multiblock_read_count=1000;

Session altered.

SYS AS SYSDBA on 12-AUG-04 >show parameter read_count

NAME                           TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_multiblock_read_count        integer        128

SYS AS SYSDBA on 11-AUG-04 >alter session set events '10046 trace name context forever,level 12';

Session altered.

SYS AS SYSDBA on 11-AUG-04 >alter system flush buffer_cache;

System altered.

SYS AS SYSDBA on 11-AUG-04 >select count(*) from t;

COUNT(*)
----------
73192

SYS AS SYSDBA on 12-AUG-04 >@gettrace

TRACE_FILE_NAME
--------------------------------------------------------------------------------
/opt/oracle/soft/JAVIS_ora_24432.trc

$ cat /opt/oracle/soft/JAVIS_ora_24432.trc|grep sca
WAIT #26: nam='db file scattered read' ela= 18267 p1=10 p2=10 p3=128
WAIT #26: nam='db file scattered read' ela= 8836 p1=10 p2=138 p3=127
WAIT #26: nam='db file scattered read' ela= 8923 p1=10 p2=265 p3=128
WAIT #26: nam='db file scattered read' ela= 8853 p1=10 p2=393 p3=128
WAIT #26: nam='db file scattered read' ela= 8985 p1=10 p2=521 p3=128
WAIT #26: nam='db file scattered read' ela= 8997 p1=10 p2=649 p3=128
WAIT #26: nam='db file scattered read' ela= 9096 p1=10 p2=777 p3=128
WAIT #26: nam='db file scattered read' ela= 583 p1=10 p2=905 p3=12
$

系统平台为:

$ uname -a
SunOS billing 5.8 Generic_108528-23 sun4u sparc
3ff0
SUNW,Ultra-4

当然具体的，Oracle一次IO能读取多少block还和很多因素有关，比如存储是否连续，磁盘是否经过条带等方式划分，并且Oracle的
单次IO读取不能跨越Extent边界等.某些平台还和操作系统的参数设置有关.

大家可以测试一下不同的平台，Oracle的单次IO最多可以读取的Block数量.