MBRC and SYSTEM STATISTICS in Oracle 10g database.

Hi All,
I am performing database upgrade from Oracle 8i Solaris to Oracle 10g HP-UX using exp/imp method.
But i do have some doubts regarding MBRC and System statistics.
MBRC in Oracle 10g is automatically adjusted if MBRC parameter is not set, but i found value 128 as shown below.
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for HPUX: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
SQL> sho parameter multi
NAME                                 TYPE                             VALUE
db_file_multiblock_read_count        integer                          128Also i performed one simple full table scan to test it...but db file scattered read is performing on 128 blocks. So i dont think 128 is suitable and is automatic, i mean MBRC is not set accrodingly it always uses 128.
Does this MBRC value affects whole database performance?
Regarding SYSTEM STATISTICS i found below result:
SQL> select * from AUX_STATS$
SNAME                          PNAME                               PVAL1 PVAL2
SYSSTATS_INFO                  STATUS                                    COMPLETED
SYSSTATS_INFO                  DSTART                                    11-09-2009 04:59
SYSSTATS_INFO                  DSTOP                                     11-09-2009 04:59
SYSSTATS_INFO                  FLAGS                                   1
SYSSTATS_MAIN                  CPUSPEEDNW                     128.239557
SYSSTATS_MAIN                  IOSEEKTIM                              10
SYSSTATS_MAIN                  IOTFRSPEED                           4096
SYSSTATS_MAIN                  SREADTIM
SYSSTATS_MAIN                  MREADTIM
SYSSTATS_MAIN                  CPUSPEED
SYSSTATS_MAIN                  MBRC
SYSSTATS_MAIN                  MAXTHR
SYSSTATS_MAIN                  SLAVETHRNow whether NOWORKLOAD or WORKLOAD is better, and this server is still under building process....so how can i collect WORKLOAD stats as high load on this server can't be performed?? Is it really require to gather system statistics, what will happen with NOWORLOAD stats?
I have not seen single database where system stats are gathered in our organisation having more than 2000 databases.
-Yasser

Maybe this article written by Tom Kite helps:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:499197100346264909

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re-started db but no help...
SQL> grant sysdba to sys;
grant sysdba to sys
ERROR at line 1:
ORA-01990: error opening password file
I re-created
$ORACLE_HOME/bin/orapwd file=$ORACLE_HOME/dbs/orapwmydb.ora password=xxxx entries=5 force=y
but no help..
Could one please help out... ! great thanks in advance..

thanks for prompt reply .. but still one issue remain..
oracle DEVS $ sqlplus sys@sid sysdba
SQL*Plus: Release 10.1.0.4.0 - Production on Thu Jan 7 10:51:44 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-01031: insufficient privileges
but i can able to login as sqlplus sys as sysdba
SQL> select * From v$pwfile_users;
no rows selected
i tired to do
SQL> grant sysdba to sys;
grant sysdba to sys
ERROR at line 1:
ORA-01990: error opening password file
'/u02/app/oracle/product/10.1.0/dbs/orapw'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
there is already one password file with orapwsid.ora.. how this should be solved ? please help. thanks

MBRC and SYSTEM STATISTICS in Oracle 10g database.

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