Oracle 9i SGA_MAX_SIZE And DB_CACHE_SIZE
Sep 21, 2010
I've done lots of reading about these two parameters, SGA_MAX_SIZE and DB_CACHE_SIZE.
What I understand now is, that setting db_cache_size to a target value and setting all other buffer cache setting to 0 will enable Oracle 9i to automatically manage buffer cache values, right? This is, per meta link document 223299.1 the most important parameter in Oracle 9i regarding memory management.
Now, SGA_MAX_SIZE set the maximum value at wich I can increase the db_cache_size to?
The question is ; WHY? Why should I allocate 1G of RAM to my oracle instance and not set the db_cache_size to the exact same value? What happens with the difference in memory between the SGA_MAX_SIZE and the DB_CACHE_SIZE, ex :
SGA_MAX_SIZE = 1000M
DB_CACHE_SIZE = 500M
What happens with the 500M left over, is it used for anything ?
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Aug 23, 2012
SQL> show parameter sga
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 1152M
sga_target big integer 0
[code]....
in scenario above, the database do not using ASMM, and spfile If I wan to increase db_cache_size parameter, do i need to rebounce instance?
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May 28, 2013
I am having 11gr2 database on a 2 node RAC cluster . OS is RHEL version 5.8When i change the SGA_MAX_SIZE to 5GB, after i bounce it shows as 15GB.
I am trying to set my SGA_TARGET and SGA_MAX_SIZE to 5G. But after bouncing SGA_MAX_SIZE is showing as 15GB and not as 5GB
I also tried edit in pfile and then create spfile and started up with spfile. But still same i am observing.
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May 24, 2013
To tune the OID11g the DB parameter recommendation is :
sga_target Minimum 60% of RAM
sga_max_size Minimum 60% of RAM
db_cache_size Minimum 60% of RAM
So what is RAM size..is that the RAM size on the linux BOX which is 8 GB in my case
or RAM size assigned to Oracle DB?
If I take RAM size 8 GB I am not able to modify the parameter. I am getting below error:
SQL> alter system set sga_max_size=4916M scope=both;
alter system set sga_max_size=4916M scope=both
*
ERROR at line 1:
ORA-02095: specified initialization parameter cannot be modified
how to check that total memory assigned to Oracle DB?
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Jun 28, 2012
I was just wondering how is the relationship between MEMORY_TARGET and SGA_MAX_SIZE parameters, if exists any at all.I set my memory parameters as:
# Enable AMM
MEMORY_MAX_SIZE=10G
MEMORY_TARGET=4G
# Disable ASMM
SGA_TARGET=0
SGA_MAX_SIZE=0
So I bounce my instances and when I checked the parameter SGA_MAX_SIZE, Oracle automatically set a value of 2456M to it:
sga_max_size big integer 2456M
sga_target big integer 0
Reading MOS ID 443746.1, there is no clear mention about this relationship. It seems that Oracle automatically set SGA_MAX_SIZE as 60% of MEMORY_TARGET.
In am running Oracle 11gR2 (11.2.0.2.3) under Red Hat Linux.
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Sep 24, 2013
The Memory tuning advisor has recommended that I increase the size of the SGA_TARGET to 5G, from my current size of 3G.
SQL> select * from v$sga_target_advice order by sga_size;
SGA_SIZE SGA_SIZE_FACTOR ESTD_DB_TIME ESTD_DB_TIME_FACTOR ESTD_PHYSICAL_READS
---------- --------------- ------------ ------------------- -------------------
1536 .5 1555141 1.667 7251211
2304 .75 949130 1.0174 4572127
3072 1 932898 1 2258733
3840 1.25 930939 .9979 2168835
4608 1.5 929819 .9967 2005529
5376 1.75 929166 .996 2005529
6144 2 928980 .9958 2005529
7 rows selected.However, the SGA_MAX_SIZE parameter is set to 3G, so when I do:
SQL> ALTER SYSTEM SET sga_target=5376M scope=both;
ALTER SYSTEM SET sga_target=5376M scope=both
*
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-00823: Specified value of sga_target greater than sga_max_size
My database used spfile. I know that the procedure to change this is the following: Create pfile from spfile, shutdown immediate, change value in pfile, startup with pfile..However, the pfile does not have any parameter called max_sga_size. It only has the following:
<dbsid>.__sga_target=3221225472
*.sga_target=3221225472
how to change sga_max_size?
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update scl_profile
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[code]........
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PLS-00201: l'identificateur 'DBMS_XMLDOM.DOMDOCUMENT' doit etre declare
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at oracle.sysman.assistants.dbca.backend.InitParamAttributes.loadAllInitParams(Compiled Code)
at oracle.sysman.assistants.dbca.backend.InitParamAttributes.initialize(InitParamAttributes.java:313)
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[code]........
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SQL>
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See the attachment file here.
Attached File(s)
query_request.txt ( 2.37K )
Number of downloads: 3
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