Memory Management - Choose Parameters For Server With A Fixed RAM?

Apr 18, 2011

the erelationship between sga_max_size,sga_targt,shared_pool_size,pga_aggregate_target and the server memory.

In short how shud i choose the above parameters for a server with a fixed RAM.

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Server Administration :: Automatic Memory Management

Apr 7, 2013

I have read this article:

[URL].........

And i see:

Quote:
If MEMORY_TARGET is set to non zero value:
SGA_TARGET, SGA_MAX_SIZE and PGA_AGGREGATE_TARGET are set to 0, 60% of memory mentioned in MEMORY_TARGET is allocated to SGA and rest 40% is kept for PGA.

So, I have set:
alter system set sga_target=0 scope=spfile;
alter system set pga_aggregate_target=0 scope=spfile;
alter system set sga_max_size=0 scope=spfile;
alter system set memory_max_target=512M scope=spfile;
alter system set memory_target=300M scope=spfile;

, and then bounced the instance.
After startup, I see:

SQL> startup
ORACLE instance started.

Total System Global Area 272027648 bytes
Fixed Size 1384012 bytes
Variable Size 100663732 bytes
Database Buffers 163577856 bytes
Redo Buffers 6402048 bytes
Database mounted.
Database opened.
SQL>

But Total System Global Area should't be in that case 60% of memory mentioned in MEMORY_TARGET? Memory mentioned in MEMORY_TARGET was 300M, and 60% of 300M is 180M, which is not 272027648 bytes.

I just want to use automatic memory management, so I've set the other parameters above to 0. My instance is on my local machine, so just for my own personal use.

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Automatic Memory Management In 11g

Nov 27, 2012

I have a quick question about Automatic Memory Management in 11g. I know that it combines the SGA and PGA components together, but the pga_aggregate_target (in 10g) was a target, rather than a strict limit. In certain circumstances you could (and we have) exceed the pga_ aggregate_ target by quite some way.

If I use AMM, does this enforce a limit on the PGA usage – or if I through enough bind variables at it, can I still exceed the ‘target’?

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Performance Tuning :: Queries On PGA Settings And Related Memory Management?

Feb 11, 2011

I have few queries on PGA memory management.Since these queries are based on 2-3 examples not exactly same by nature I am summarising it after my understanding for the same

As I understand many workareas can be allocated to a single sql statement and number and sizes of theses workareas is controlled internally by Oracle when Automatic Memory management (PGA_aggregate_target and workarea_size_policy=Auto are set) Since many sessions share the PGA memory, the amount of memory available to each session may vary and if less amount of memory is available for a session for sorting then TEMP tablespace is used

[1] Can we say paging happens and can be checked at this time?

[2] Is there a difference in handling memory while populating pl/sql tables?

As I have encountered ora-04030 while some our developers were populating pl/sql tables but never encountered this error for sorting, hash joins etc Though I don't remember the width of pl/sql table, I am sure the developer used 'LIMIT' clause during bulk collect and still faced the issue.

With a single session on the server, I noticed that the difference in values displayed issuing 'free' command in linux and output values from sesstat did not match at all while there wasn't any heavy OS process involved during the period. I was expecting 'used' and 'free' values displayed by free command (linux) will change and difference would be approximately equals 'before and after values of session pga memory.

[3] Isn't it expected to match?

[4] Can we say in dedicated server, at any moment of time, the SUM of 'session pga memory' represents all the memory used by Oracle SGA, at that point of time?

select sum(value)/1024/1024 "memory in MB" from v$sesstat where statistic#=20;

During one of the tests I got following output (divide value by 10 for my visibility and avoid formatting)

SQL> select a.name, to_char(b.value/10, '999,999,999') value
from v$statname a, v$mystat b
where a.statistic# = b.statistic#
and a.name like '%ga memory%'; 2 3 4

[code]...

The above query is showing above values even when the pl/sql block execution is completed 30 minutes back

[5] Do we call this as 'memory leak' where memory is not released even while some time has passed since session has done something?Of course I am not checking at OS level as mentioned in question [3] above the values won't match!

Still the output of free command for reference(After the pl/sql block executed)

SQL> !free
total used free shared buffers cached
Mem: 3016796 2999660 17136 0 4308 1173260
-/+ buffers/cache: 1822092 1194704
Swap: 1048568 636124 412444

--(After the pl/sql block executed)

SQL> select * from v$pgastat;
NAMEVALUEUNIT
aggregate PGA target parameter 524288000bytes
aggregate PGA auto target 456256512bytes
global memory bound 26214400bytes
total PGA inuse 17328128bytes

[code]...

[6] What could be the significance of negative values of 'session pga memory/max'?

Last We have an OLTP system and in the night we run batch processes in 2-4 sessions

Suppose I have 10 GB RAM and with PGA setting of 3.5 GB Now I want the batch process sessions to use max possible memory during nighttime and toggle the setting back in the morning

[7] With above settings (10 GB RAM and 3.5 GB PGA) how can I divide the memory among 4 sessions?

Shall I set 1) PGA_aggregate_target=0 2)Workarea_size_policy=manual 3) Sort_are_size 4) Hash_area_size

[8] What would be approx values for parameter 3 and 4? will it be straight 3.5 GB/ 4?

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Database Connection And Memory Parameters

Sep 4, 2012

I have 3 questions.

I have 11.2.0.1 database on Windows 2008 R2 SP1.

1) While connecting to the database as sysdba (sqlplus "/as sysdba"), it takes about 12 to 15 seconds what things I need to check/change so that connection will be faster?

2) Also, I have read somewhere that changing the sga/memory parameters connecting to the database. is it true?

3) This is not concerned with above 2 questions. What should be the memory parameters size for a 8 gb database?

What I have is:

Total System Global Area 1068937216 bytes
Fixed Size 2182592 bytes
Variable Size 1027605056 bytes
Database Buffers 33554432 bytes
Redo Buffers 5595136 bytes

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Nov 18, 2012

I have a question regarding memory parameters in oracle database 9.2.0.8, especially sga_max_size and db_cache_size. Database server has 32G of ram. Oracle parameter on server shmmax is set to 16G. Is reasonable to set sga_max_size to the same value, and db_cache_size to 80% of that size?

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Jul 25, 2012

I have the following setup

SQL> show parameter sga;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 3G
sga_target big integer 2G

from what I read I beleive this will initially grab 2GB of memory on startup and will grab up to to 3GB of memory total for the SGA. The "total" memory can be allocated to different peices of the SGA when needed but will never exceed 3GB. Is this correct or would these settings infringe on any available memory on a system that is already tight on memory?

Secondly, what happens if both these values are set to the same value?

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How the people in production counts the exact position of the data in fixed format of Sql*loader? Isn't it critical especially in a critical and having many column to be inserted.

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Jun 21, 2011

if i have table contains the following

r_nu record_s value time
1 11111 1 33904
2 30119 4 33904
3 70119 3 33904
4 11111 2 33904
5 20219 1 33920
6 11111 3 33920
7 50119 4 33935

if i want sql statement to select the first value of record_s and the second (both same value) and ignoring the rest

maybe to subtract its value from its second value

got it ?

so will choose
record_s 11111 and value 1
record_s 11111 and value 2
to do : value of second one - value of first one
2-1

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how we can perform the tablespace management? monitor the tablespace and tune the tablespace space.

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Presently its Segment Space Mgmt is manual for System, RBS, Temporary tablespaces.

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I have been reading various articles about the undo management. This basic concept of undo management is simple but how oracle implements it is bit harder for me to grasp.

What i have read and understood is that whenever a DML(Update, Delete, Insert) statement is issued by a user, the data is fetched from datafile to database buffer cache and at the same time a copy of the original data is saved in undo segment. Now if other users requests the same data, they are presented with the unchanged copy in the undo segment.

Now I have the following questions:
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Even the links on the patch details page go to "page not found".

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Feb 16, 2013

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--this is the main table
create table batch_item (batch_no varchar2(12),item_batch varchar2(12),total_batch_qty number);

insert into batch_item ('0001','a',300);
insert into batch_item ('0002','b',200);
insert into batch_item ('0003','a',102);

--after inserting the data i should be able to move this data to corresponding batches by manually selection and pushing them to a batch.create table ct_item (item varchar2(12),item_nm varchar2(20),item_qty number);

insert into om_item values ('a','alpha',2);
insert into om_item values ('b','beta',3);
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--left side is om_item and right will have batch items where batch qty will be accumulated upon choose arrows.

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want to know the internal functional flow of timesten when any command is fired against it.

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Since it's 10.2.0.4 database. I have dropped this table by using purge

drop table <<table_name>> purge;

Once table drop was completed. When I check the tablespace space it was 100% free but due to HWM was unable to resize the datafile from current size to small size. What was the reason behind this. Is there any process needs to follow when dropping big tables ? like instead of dropping the tables do I need to truncate first & then drop .

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SQL> SELECT A.TABLESPACE_NAME,round(SUM(A.TOTS)/1024/1024) "Tot size MB",
2 round(SUM(A.SUMB)/1024/1024) "Tot Free MB",
3 round(SUM(A.SUMB)*100/SUM(A.TOTS)) "%FREE",
100-round(SUM(A.SUMB)*100/SUM(A.TOTS)) "%USED",
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4 5 6 FROM (
7 SELECT TABLESPACE_NAME,0 TOTS,SUM(BYTES) SUMB,
[code]...

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select v.value
from v$parameter v
where v.name = 'cpu_count';

return value "1"

select o.value
from v$osstat o
where o.stat_name = 'NUM_CPU_CORES';

No row returned.

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select v.value, o.value -- or NVL(o.value, 1)
from v$parameter v, v$osstat o
where v.name = 'cpu_count'
and o.stat_name (+) = 'NUM_CPU_CORES';

no row returned

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DECLARE
CURSOR Cursor_A IS
SELECT * FROM EMP_A;
CURSOR Cursor_B IS
SELECT * FROM EMP_B;
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[code]....

I want to avoid maintaining the same long list of transformations. I also want to avoid, if possible, an explicit FETCH INTO, because there are hundreds of fields in both tables. I'm looking for something like this (and I know this doesnt work):

DECLARE
CURSOR Cursor_A IS
SELECT * FROM EMP_A;
CURSOR Cursor_B IS
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RUNA CHAR(1) := 'Y';
CursorToRun IS REF CURSOR;

[code]....

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[URL].........

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Is this a viable size? Do you think this will actually improve performance on my system? Note that this database gets about 1500 insertions per second and peaks around 3000 insertions per second, it is a mixture of OLTP and data warehousing.

After doing a lot of research I came across an article by "Don Burleson" which says that starting in Oracle 10gR2 the "Oracle recommends not setting the db_file_multiblock_read_count parameter, allowing Oracle to empirically determine the optimal setting." References: URLs.....

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Date
From 29-09-2011 to 04-10-2011
Time
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I tried the below queries, it doesnt work
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where pollinterval=1 and detectorid=�AIDC_0154� and updatetime between to_date(�29-aug-2011:00:00:00�,�DD-MON-YYYY:HH24:MI:SS�)

[code]...

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