How Is Relationship Between MEMORY_TARGET And SGA_MAX_SIZE Parameters
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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Mar 28, 2010
I read in few blog and they are saying, oracle11g allocate 60% of the memory to SGA and 40% of the memory to PGA when we enable MEMORY_ TARGET to non-zero.Here are few blogs. URL.....It is not working on that way(60:40) on my database.
Here is my DB version.
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE 11.1.0.7.0 Production
TNS for Linux: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - Production
[code]....
I am not able to find 60%:40% concept in oracle document..so all the above blogs info are wrong?
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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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Feb 5, 2013
I decided to use Oracle 11g XE on Linux Mint. I read this tutorial Oracle 11gR2 Express Edition on Linux Ubuntu 11.10 howto included the seventh part. However, I did a minor change in the script given. Indeed, since Ubuntu 12.04, a bug appeared. So I use the following script :
cat > /etc/init.d/oracle-shm <<-EOF
#! /bin/sh
# /etc/init.d/oracle-shm
#
#
case "$1" in
start)
[code]...
I already uninstalled and reinstalled Oracle 3-4 times, but nothing else happened. When I want to configure oracle-xe, I have a such message :
Starting Oracle Net Listener...Done
Configuring database...
Database Configuration failed. Look into /u01/app/oracle/product/11.2.0/xe/config/log for detailsAnd this is the content of the file postDBCreation.log :
begin
*
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 0
Session ID: 0 Serial number: 0
[code]...
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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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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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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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Oct 18, 2012
I want to know how many managers have employees under him?
I mean to say one manager may have multiple employees from employees table.
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Mar 7, 2013
I have one RDBMS concept question.if i have 2 tables with 0 to many realtionship. can i create referential integrity constraint between them?
In other words how can i tell whether the records in table A(child table) are not orphan records and have 0 to many relationship with table B(parent table) ? Right not there is no constraint defined on both tables.
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Apr 29, 2011
I've a table (RelationshipX) with two columns with following values. The table represents the relationships. When I run the following query, It will give me all the combination of relationships...however, I need to get 15 unique as defined below.
Col1Col2
1106011060
1106011640
1106011142
1106011095
1106013029
1106014058
I run the following query to get below of all the combinaiton (note, I am opting out those six rows which matches to each other) select a.Col2 as Col1, b.Col2 as Col2 from RelationshipX a, RelationshipX b
where a.Col1 = 11060
and a.Col1=b.Col1
and a.Col2 <> b.Col2
order by Col1, Col2
[code]....
HOW can I modify my SQl so I get only 15 unique relationship records. (For example two UNDERLINE rows are technically same, and there are total 15 of them)???.
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May 13, 2011
Just wanted to pose a question Can a (Unique and Not nullable)Alternate key of the parent table be part of child Table in an Identifying relationship i.e part of primary key of a child table????
Is there a rule that a primary keys of a parent table can be used to build a identifying relationship with its child?
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Apr 27, 2010
I have a table which has 2 one to many relationships like a tree structure in the same table, is there a way that I can show the same on the form and be able to do the insert and update on the same table?
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Mar 6, 2011
Quote: Originally Posted by Silverj2k11
ALTER TABLE CONTRACT
ADD FOREIGN KEY (client_id)
REFERENCES client(client_id);
Didn't work! I am now losing my mind.
ORA-00904: "CLIENT": invalid identifier You do have a table named CLIENT?
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Oct 11, 2013
I have been told to create a query which should give out the same output as the UI of an exception management application . However , many referenced tables have one to many relationship . I created a query using a function which was giving the required output . But the performance of the query was not good as for each row . Is there a method to create a select using joins to show one to many relationship in a table .
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Feb 6, 2012
Would there be any problem / error when we import the dump file (which has parent table) on target database ?
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Feb 24, 2007
the relationship on my script.What I want to do is make it possible to assign many courses to a student.But I have read a few books on foreign keys and primary keys, and I still dont get how to go on doing this....
This is how the table creation with the keys looks right now...
CREATE TABLE CAMPUS (
CAMPUSID NUMBER(4) NOT NULL,
NAME VARCHAR2(80) NOT NULL,
CONSTRAINT CAMPUS_PK PRIMARY KEY (CAMPUSID));
[code]...
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Aug 8, 2011
I have a table called FAMILY which holda the data like , for father_gen_1 --->father_gen_2 --> father_gen_3 -- son.
father_gen_1 father_gen_2 father_gen_3 son
ABC XYZ GEF MNC
ABC lmn kth
I want to get the output which is a three column heirarical table and holds the parent child relationship Like following:-
id name parent_id
1 ABC NULL
2 XYZ 1
3 GEF 2
4 MNC 3
5 LMN 1
6 KTH 5
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Mar 5, 2010
i'm trying to display the hierarchical relationship between the tables (parents-child-subchild).
[b]table structure[/b]
DEPT
|PK-DEPT_ID
|
EMP
|pk-EMP_ID
|fK emp_DEPT_fK((FK column is dept_id references dept table dept_id column))
[code]....
but by using below query i am not getting complete heirarichy.
SELECT LEVEL,
Table_Name,
Constraint_Name,
R_Constraint_Name ,
SYS_CONNECT_BY_PATH(Table_Name, '/') Path
[code]....
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May 22, 2012
I have a DB that has one parent table with many child tables. I would like to delete all records(child - parent) based upon a particular "net_id". I have three versions that "seem" to work BUT I'd like to use "version2" because I want to go to the parent one time(for the parent delete I just made it simple for me) only and be able to delete the child record(s) from the child table(s). I want to achieve this w/o using triggers...
My question: Is version2 an "ok" way to delete child records or should I try another method(version1 or 3)??
create table PARENT
(
event_id NUMBER,
event_title VARCHAR2(50),
net_id VARCHAR2(16)
);
--truncate table parent;
insert into parent
(event_id, event_title, net_id)
values
(1, 'title1', 'CURLY');
[code]...
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Nov 16, 2012
I have a requirement like below
I have 3 tables (Prospect,customer,user) and I have a contact_dtls table .
In prospect table Prospect_id is the primary like this customer_id in customer table and user_id in the user table
in the contact_dtls table I have a column contact_id and other cols.The contact_id can be from prospect_id,customer_id and user_id in other words we can tell the prospect can be a contact or the customer can be a contact and the user also can be a contact also.
Now the question is "is it possible to maintain primary key and foreign key relationship with this design that means the prospect_id,customer_id and user_id would be the foreign keys to the contact_dtls table.
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Feb 21, 2012
I have a form that contains a tab canvas. On the second canvas page I have two data blocks with a master detail relationship.The first block (master) is driven by a table (table_one) with the following fields:
sf_id (PK)
sf_code - VARCHAR2(40)
sf_desc - VARCHAR2(250)
The second block (detail) is a repeating block driven by a table (table_two) with the following fields:
error_code - VARCHAR2(40
error_code_desc - VARCHAR2(250)
is_major_error - VARCHAR2(1)
error_type - VARCHAR2(1)
error_is_active - VARCHAR2(1)
update_date - DATE
sf_id (FK - table_one.sf_id)
The second block only shows error_code and error_code_desc. The point of this canvas page is to add/remove master records and associate detail records with a master. I never want to actually insert or remove records from table two; merely updating the sf_id column in table two.What I am trying to achieve is the following:
1. Create a master record with detail records at the same time.
2. Delete a master record
3. Add and remove detail records
An insert into the detail block is nothing more than associating a master record with a detail record by updating the sf_id column in table two. A delete from the detail block is nothing more than setting the sf_id column to null in table two. I am not actually adding or removing records in table_two.
I have tried overriding the commit on the second block to perform updates instead of Oracle actually trying to insert NEW records into table_two.
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Mar 27, 2010
I'm designing a canvas which will open up on the click of a push-button from a form A. Now this form A has a data block(ie. single underlying table A).
I want to display data from two tables - Table B and Table C in this canvas in the form of a multi-record grid structure - one below the other i.e. table B data above and table C data below.
Now table B and table C share a PK-FK relnship between them. What I want is when a user clicks on a record in the table B above then the corresponding records in the table C should get displayed below(now there can be multiple detail records in table C for a single record in table B - PK-FK reln)
i'd written code something like this in the When-button-pressed trigger:-
c_where_clause := ....(query from Form A)
set_block_property('block B',default,c_where_clause);
go_block('block B');
go_block('block C');
execute_query;
first_record;
(in addition to the above trigger, I have also included queries in the post-query trigger of the two tables B and C to get some data populated in the non-database fields in this canvas)
do i have to do add a piece of code to loop thru the records...like checking for last record,if not going to the next_record and so on for both the blocks?
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Apr 23, 2010
I have a table which uses parent-child relationship to store the options available. I need a procedure to give me the full path given the id of a particular option.
I have two different functions. One of them uses the Oracle built in function and the other uses simple queries with a loop.The code of the functions are given below.
Now, the problem is with their "performance". The difference in their performance is significant. The function using the Oracle function takes more than 2 hours to run a query whereas the other function takes less than 2 minutes.
I am having trouble trusting the other function. No matter how many tests I perform on the output of both the functions, it always comes out to be the same.
Function 1
=====================
FUNCTION Gettree (opt_id IN NUMBER,i_app_id IN NUMBER)
RETURN VARCHAR2
IS
path VARCHAR2(32767);
application_no NUMBER;
BEGIN
[code]...
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Jan 4, 2012
I am working on a project, the insert statement is not functioning properly and I cannot find the error The error is in the insert statement for CustOrder. The error states that NULL cannot be inserted into CustOrder.CustID. I have declared CustID and its reference. I have looked over the code several times and I cannot find the problem.
If it makes a difference I am using APEX. The company has not database or program to work with a database so I am building everything from scratch.
declare
l_CustOrderID number;
l_CustID number := :P11_CustID;
begin
[code]....
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Dec 20, 2012
can we use set_block_property to program to switch multiple relationships. for example
if true then use relationshipA
else relationshipB
end if;
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Oct 3, 2010
Is there any relationship b/w tuning BUFFER CACHE and BUFFER BUSY WAITS?
1) Buffer Busy Waits are happening as the User process found the same Datablock is being used by another user in the BUFFER CACHE.
2) And also happens, when the server process found the same Datablock are being used in the Datafile.
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May 14, 2010
I have data in a table which don't have parent child relation ship. Can I display the data in that table in hierarchical tree item in a form.
Is it a must that data should have parent child relationship to display them in hierarchical tree item in a form.
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Jun 14, 2013
Oracle Version:11.2.0.3/ OEL 6.1
For diagnosing a performance issue related to a batch run, our application teams wants to know all session/system level parameter that affects SQL performance. I can't simply give an output of v$parameter.name and v$parameter.
value as there will lots of parameter not related SQL performance like
diagnostic_destlog_archive_dest_1deferred_segment_creationcontrol_filesbackground_core_dump
I am looking for only those parameters which are relevant to SQL performance, like
optimizer_modestatistics_levelmemory_targetsga_target
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Apr 16, 2013
How can you use pivot with a parameter? If you attempt to use a parameter then an ORA-500: bind variable not supported is given
Below is a simplified version of the sql to illustrate teh problem.
create table test_pivot
(
ord_no number,
qty number,
loc varchar2(10)
):
insert into test_pivot values (123, 3, 'LOC1');
insert into test_pivot values (123, 2, 'LOC1');
insert into test_pivot values (234, 4, 'LOC1');
insert into test_pivot values (234, 5, 'LOC1');
-- this one is fine
Select * From
(
Select Ord_No, Qty, Loc
From Test_Pivot
Where Ord_No In ('123', '234')
)
Pivot (Sum(Qty) For Ord_No In ('123', '234') )
-- how to use pivot with parameters
Select * From
(
Select Ord_No, Qty, Loc
From Test_Pivot
Where Ord_No In (:Ord1, :Ord2)
)
Pivot (Sum(Qty) For Ord_No In (:Ord1, :Ord2) )
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Dec 22, 2010
the same query i put below but in oracle.
I'm trying to declare and set parameters in oracle
I'm trying to do something similar as the follow SQL Server Sentence:
------------------------------------------------------
DECLARE
@Year SMALLINT,
@City varchar(255)
SET @Year = 2010
SET @City = ''NY','NJ''
[Code]....
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