Setting sga_max_size and memory_target

what happens when i set
sga_max_size = 4500
memory_target = 5000M
memory_max_target=5000M
sga_target=0
can / will oracle use more than 4.5GB for sga ?
can pga grow more than 500M ?
startup;
ORACLE instance started.
Total System Global Area 4710043648 bytes
Fixed Size 2234376 bytes
Variable Size 3925870584 bytes
Database Buffers 771751936 bytes
Redo Buffers 10186752 byt

user9198889 wrote:
g777 wrote:
hi
DB and OS version would be nice to see...
look here
http://www.dba-oracle.com/oracle11g/oracle_11g_memory_target_parameter.htm
SGA_MAX_SIZE & SGA_TARGET
linux 5.5
db 11.2.0.2 rac GI 11.2.0.2thanks for the links,
"When using AMM (by setting memory_target, and/or sga_target, the values for the “traditional” pool parameters (db_cache_size, shared_pool_size, &c) are not ignored. Rather, they will specify the minimum size that Oracle will always maintain for each sub-area in the SGA.
so that means PGA wont grow more than 500MB and SGA be set to minimum of 4.5GB?
actually if you carefully read the above comment it doesnt mentiond sga_max_size it only says traditional pools such as db_cache_size etc...
does this also include sga_max_size?
I had a look at the other link to a thread but the question is slightly diffrent, they are discussing relation of sga_target to memory_target, I am intrested to know about sga_nax_size inrelation to memory_target

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SGA_MAX_SIZE and AMM

Hi, all,
I've been testing using AMM in our newly-upgraded 11gR2 databases. All databases (Prod and non-Prod) are running 11.2.0.3 on AIX 5.3 (64-bit).
I noticed that despite me explicitly setting the following to 0:
alter system set db_cache_size = 0 scope=spfile;
alter system set log_buffer = 0 scope=spfile;
alter system set pga_aggregate_target = 0 scope=spfile;
alter system set sga_max_size = 0 scope=spfile;
alter system set sga_target = 0 scope=spfile;
alter system set shared_pool_size = 0 scope=spfile;
alter system set shared_pool_reserved_size = 0 scope=spfile;
And allowing Oracle 'full control' how it manages all parts of the memory (SGA and PGA)
-- The 'big' database
alter system set memory_max_target = 24G scope=spfile;
alter system set memory_target = 24G scope=spfile;
-- The 'small' database
alter system set memory_max_target = 3G scope=spfile;
alter system set memory_target = 3G scope=spfile;
I bounce both databases and things seem to come up OK. The only exception is that sga_max_size seems to be set to a specific value:
For the 'big' database, it's 16Gb (2/3rds of the total memory_target)
For the 'small' database, it's 1536Mb (1/2 of the total memory_target)
I don't really understand why this is happening. I've double-checked my SPFILE, I've queried v$spparameter and I've read MOS 443746.1
+"If MEMORY_TARGET is set to a non-zero value:+
+If neither is set, they will be auto-tuned without any minimum or default values. We will have a policy of distributing the total memory set by MEMORY_TARGET parameter in a fixed ratio to the the SGA and PGA during initialization. The policy is to give 60% to the SGA and 40% to the PGA at startup."+
BUT I presume that sga_max_size works in the same way that it did when we weren't using AMM - it's the upper limit of the SGA. Not ideal, to be honest, as I can definitely see times when the SGA needs a LOT of buffer cache in Production (and, therefore, lots of SGA)
I do see this in the alert.logs whenever I restart the system:
Using parameter settings in server-side spfile /opt/oracle/product/11.2.0.3/db/dbs/spfilebigdb.ora
System parameters with non-default values:
processes                = 600
sessions                 = 928
timed_statistics         = TRUE
resource_limit           = TRUE
event                    = "10262 trace name context forever, level 160000"
sga_max_size             = 16G
So it's suggesting that it's querying the SPFILE and determining that sga_max_size should be set. But I've double-double-checked and that isn't the case.
Now, I know I can get around this by explicitly setting sga_max_size at memory_target. But I was wondering if anyone else had seen this before too?
Mark

Another workaround is to remove the memory components entirely from the SPFILE (instead of having them set to 0, don't have them in the file at all). This seems to also set the sga_max_size to the memory_target - which is expected behaviour given the MOS note.

Memory_max_target and memory_target on 11.2

Hi gurus,
after an upgrade from DBMS10g to 11.2 our DBA changed manually parameters about memory in the following way:
*.db_cache_size=2113929216
*.hash_area_size=101310720
*.java_pool_size=83886080
*.log_buffer=5097152
*.memory_target=0
*.pga_aggregate_target=838860800
*.sga_max_size=12884901888
*.sga_target=0
*.shared_pool_reserved_size=61331648
*.shared_pool_size=1677721600
Is this the right way to configuree parameters on 11g? or is better to set only the .memory_max_target and memory_target and allow Oracle to manage dynamically the other memory size?
Thanks in advance.

Hi DDF,
It is simple to use SGA_TARGET with SGA_MAX_SIZE (Need to allocate PGA) or Memory_target witn memory_max_target (not need to define PGA).
But make sure your applications are running ok with that setup. Sometimes you may need to define other memory parameters.
Cheers
M

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I have an 11g database on windows with 4GB RAM, I have set the MEMORY_MAX_TARGET and MEMORY_TARGET, what should I do with the pre-existing sga_max_size and sga_target values

memory_target = sga_target + max(pga_aggregate_target, maximum PGA allocated)
MEMORY_MAX_TARGET = sum of the SGA and instance PGA sizes.
For Automatic memory management
set
ALTER SYSTEM SET SGA_TARGET = 0;
ALTER SYSTEM SET PGA_AGGREGATE_TARGET = 0;
Note:
In a text initialization parameter file, if you omit the line for MEMORY_MAX_TARGET and include a value for MEMORY_TARGET, the database automatically sets MEMORY_MAX_TARGET to the value of MEMORY_TARGET. If you omit the line for MEMORY_TARGET and include a value for MEMORY_MAX_TARGET, the MEMORY_TARGET parameter defaults to zero. After startup, you can then dynamically change MEMORY_TARGET to a nonzero value, provided that it does not exceed the value of MEMORY_MAX_TARGET.
Note:
The preceding steps instruct you to set SGA_TARGET and PGA_AGGREGATE_TARGET to zero so that the sizes of the SGA and instance PGA are tuned up and down as required, without restrictions. You can omit the statements that set these parameter values to zero and leave either or both of the values as positive numbers. In this case, the values act as minimum values for the sizes of the SGA or instance PGA.
Reference

Increase the SGA_MAX_SIZE and SGA_TARGET parameters

HI ,
I am using oracle 10g R2 and windows server 2003 .
My server is having 8 GB RAM .
I want to increase the SGA_MAX_SIZE and SGA_TARGET parameters .
I am using the below command , but getting the error
SQL> alter system set sga_max_size=2000M scope=spfile ;
alter system set sga_max_size=2000M scope=spfile
ERROR at line 1:
ORA-32001: write to SPFILE requested but no SPFILE specified at startup
Can someone please help ..

hi
connect as sys user and then try...
first make folder as backup and then copy the old SPFILEorcl to the same folder(backup)
now you can easily modify the files otherwise you will get error..
you will find here..
C:\ORACLE_HOME\database
SQL> alter system set sga_max_size=2000M scope=spfile ;
System altered.OR.
connect as sys user.
and do the following...
1).SQL>create pfile from spfile;
2).modify the pfile and decrease\increase the size of pools.
3).shutdown database.
4). Startup database using created pfile.
if it start ok then.
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Increase SGA_MAX_SIZE and SGA_TARGET

Hi all,
I want to increase SGA_MAX_SIZE and SGA_TARGET in 10g. Currently we have
SQL> sho parameter sga
NAME TYPE VALUE
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 2384M
sga_target big integer 2384M
And we have 16GB RAM in redhat linux 4(32 bit).Oracle 10.2.0.3 DB.
Because of 32 bit OS, I was not able to increase shmmax more than 4GB.
In this situation how and how much SGA_MAX_SIZE and SGA_TARGET I can increase?
Thanks in Advance,
Sunil

Hi sunilgln,
Given the present state of things, you have to take a meassure of how many RAM is used with nothing running but the OS, that will give you the Linux footprint.
Take note of the amount of physical free memory (using top command)
Later you have to estimate how much swapping are you willing to accept, the SGA you define may be within the ranges of
FREE MEM*90% and FREE MEM*90+(OS FOOTPRINT*%SWAP MEMORY WILLING TO USE)
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Another recommendation, SGA_TARGET is dynamic, SGA_MAX_SIZE is not...but you may set SGA_MAX_SIZE to a full allocation and set SGA_TARGET to a percentage that allocation and gradually use it.
What happens is: the OS will "allocate" a chunk(or chunks) the size given by SGA_MAX_SIZE, but the real usage by the database will be determined by SGA_TARGET.
Hope this helps you
Ignacio
Regards
http://oracledisect.blogspot.com

SGA_MAX_SIZE and SGA_TARGET

DBAs,
can any one tell me in brief how SGA_MAX_SIZE and SGA_TARGET helps to tune the instance?
i have gone through with vairous link but still confuse.
Regards,
BK

hi BK,
SGA_MAX_SIZE is the maximum sizeof the shared global area (system global area), and SGA_TARGET is set when you want to use ASSM (automatic shared memory management) which is a 10g feature.
You are alos adviced to post oracle version and os.. SGA_TARGET when set, then oracle automatically manages the memory and if not set then you have to set SGA_MAX _SIZE and manually set others memory components accordingly and tune them.
I hope this helps you in a small manner
Thanks and Regards
VD

Unable to set sga_max_size parameter through spfile

My 10g db running in spfile. I am trying to decrease sga_max_size to 1024M where i have 1504 now ...
Do i am not doing in a right way ? Please suggest me
i am trying like this .....
SQL> sho parameter sga
NAME TYPE VALUE
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 1504M
sga_target big integer 0
alter system set sga_max_size =1020M scope= spfile;
SQL>system altered
SQL> sho parameter sga
NAME TYPE VALUE
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 1504M
sga_target big integer 0

SCOPE=SPFILE would not change the in-memory value. So a SHOW PARAMETER would still show the previous value.
You must compare the SPFILE before and after the ALTER SYSTEM. (Don't copy the spfile in a text editor but make a copy of the spfile to view OR use the "strings" command on Unix/Linux . If you accidentally write to the spfile with a text editor you will corrupt it. So, the best way to check the value is to run a CREATE PFILE FROM SPFILE and view the pfile which would be the initSID.ora file.

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Message was edited by:
supareno

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(106007)

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Hi,
Set parameter is used to put some value into ABAP memory area, get paramter is used to retrive values form ABAP memory.
refer the below sample code.
here i am taking one material number and i am passing that mateial number by using 'set parameter id', the material number will be stored in ABAP-memory area 'MAT', and then i am calling the Tcode 'MM03', after executing the Tcode (from program) automatically 'MM03' will reads that material number from that ABAP-memory area and it will displays the 'MM03' tcode along with material number.
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parameters: p_matnr like mara-matnr.
set parameter id 'MAT' field p_matnr.
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HT201304 It would be tremendously helpful to be able to access, set restrictions, and make changes from the parents device to all devices under the same iTunes account, so that I could make changes to my kids devices without physical access.

Please help!
It would be tremendously helpful to be able to access, set restrictions, and make changes from the parents device, to all devices under the same iTunes account, so that I could make changes to my kids devices without physical access.
I understand that I can set up a different Apple ID for the kids devices, or take physical control of the device and make the changes myself. However, my teenage son is technically savvy enough to have a job in Silicon Valley, as are most young people these days. However, in order to access his devices the current way, I first have to bypass the four digit pass code. This starts a fight of why I need in the device and continues to escalate. The argument that I am the parent will gain access but the fight is simply exhausting, and quite frankly shouldn't have to happen at all. He is not yet an adult, he did not pay for his iPad or iPhone and I, as a parent, should have not only have the right to change options at will, and from anywhere, but look at history or current activity when I feel like it.
I currently have the settings where app and in-app purchases require my password to be put in, and he must come to me to type it in, but I need more control and would like, and should be able to access any of our six devices and make individual changes simply by logging in to my account, with my password.
If I can see all my devices on the "Lost My iPhone" app, this technology should be easy to make happen.
C'mon parents! I have a pretty good kid, given all things that they can get into, but I am not stupid. For everything I see has been done, there is much more I haven't seen. I want my children to be kept safe and be able to know what they are looking at or listening to. We parents are the only ones who know our beliefs and what our kids can handle and when.
Thanks for any support or information that I may be missing in order to fulfill my request.

There are mobile device management solutions that can do this, including in Apple's OS X Server system, but most parents generally find that setting this up is more work than it's worth. If you're interested, though, there are a couple that at least purport to be free (I don't know if there are any hidden "gotchas"):
http://www.unwireddevicelink.com/features/
https://meraki.cisco.com/products/systems-manager
and Apple's system:
http://www.apple.com/osx/server/features/#profile-manager
I don't think any, however, allow you to see current activity or browser history. iOS doesn't expose those to access from MDM solutions, to the best of my knowledge.
Regards.

Setting sga_max_size and memory_target

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