Overheads of Automatic SGA.
Hello
What are peformance overheads of turning on Automatic SGA(SGA_TARGET > 0 ) feature in 10gR2(10.2.0.3)? We are migrating our OLAP database to 10g on Linux and would like to know the impacts before we do that..
How frequently Oracle performs the resize operations and how much latencies it introduces to the response time?
How do you monitor the latencies introduced by SGA resize operations? i.e. what event user session will wait ( if waits ) if resize operations are under progress?
How buggy/stable this feature is ?
user4529833 wrote:
Hello
What are peformance overheads of turning on Automatic SGA(SGA_TARGET > 0 ) feature in 10gR2(10.2.0.3)? We are migrating our OLAP database to 10g on Linux and would like to know the impacts before we do that..
How frequently Oracle performs the resize operations and how much latencies it introduces to the response time?
How do you monitor the latencies introduced by SGA resize operations? i.e. what event user session will wait ( if waits ) if resize operations are under progress?
How buggy/stable this feature is ?As with all self-managing systems, there is an overhead. It is in two specific areas - monitoring and logging of the load and adjusting the parameters dynamically. You do pose an interesting question as to which metrics are available to monitor the management process. I have not dug into it, so I can not answer the question - yet. I'm just responding to highlight that it has an impact at other times as well.
Flip side - what are the performance overheads and performance losses associated with the DBA tuning (or, more likely not tuning) the SGA & PGA manually per the various workflow requirements. This is the case that the auto tuning was likely designed to tackle.
I highly doubt that the feature will be better than a crack DBA team adjusting the pools manually based on real and known workload. But I don't run into many situations where an entire crack DBA team can be assigned to proactively manage DB performance 24x7. (Thus, the feature becomes useful in spite of overhead.)
Similar Messages
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Hi,
i've a question about Oracle 10G and their SGA. When I do in SQLplus show sga, I get for example:
SQL> show sga
Total System Global Area 167772160 bytes
Fixed Size 1247900 bytes
Variable Size 58721636 bytes
Database Buffers 104857600 bytes
Redo Buffers 2945024 bytes
when finding other parameter I get always '0', this was not in other releases...
SQL> show parameter pool
shared_pool_size big integer 0
java_pool_size big integer 0
large_pool_size big integer 0
olap_page_pool_size big integer 0
SQL> show parameter db_cache
NAME TYPE VALUE
db_cache_advice string ON
db_cache_size big integer 0
It seems that I have no control over setting those parameters, I remember at installation time it gave a % of the pc memory would be used, has it something to do with that? Can you chose between the automatic SGA-management and setting it by yourself?
thanks
greetsHi,
I also find some trace files under my udump-dir, has this also to do with the SGA?
Dump file c:\oracle\admin\orcl\udump\orcl_ora_3052.trc
Wed Nov 16 15:42:40 2005
ORACLE V10.2.0.1.0 - Production vsnsta=0
vsnsql=14 vsnxtr=3
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the OLAP and Data Mining options
Windows XP Version V5.1 Service Pack 2
CPU : 1 - type 586
Process Affinity : 0x00000000
Memory (Avail/Total): Ph:173M/502M, Ph+PgF:817M/1229M, VA:1755M/2047M
Instance name: orcl
Redo thread mounted by this instance: 0 <none>
Oracle process number: 12
Windows thread id: 3052, image: ORACLE.EXE (SHAD)
*** SERVICE NAME:() 2005-11-16 15:42:40.974
*** SESSION ID:(50.1) 2005-11-16 15:42:40.974
kccsga_update_ckpt: num_1 = 8, num_2 = 0, num_3 = 0, lbn_2 = 0, lbn_3 = 0
and:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the OLAP and Data Mining options
Windows XP Version V5.1 Service Pack 2
CPU : 1 - type 586
Process Affinity : 0x00000000
Memory (Avail/Total): Ph:210M/502M, Ph+PgF:931M/1229M, VA:1781M/2047M
Instance name: orcl
Redo thread mounted by this instance: 0 <none>
Oracle process number: 0
Windows thread id: 3596, image: ORACLE.EXE (SHAD)
KCCDEBUG_LEVEL = 0
Dynamic strand is set to TRUE
Running with 1 shared and 10 private strand(s). Zero-copy redo is FALSE
these comes every time after restarting the instance. Does this means that I will have hundreds of files after a time? -
We have a production Oracle 11g DB in which SGA_TARGET is 0 but ASSM is enabled but the documentation on Oracle says that if SGA_TARGET is 0 means that ASSM is disabled. Also, PGA_AGGREGATE_TARGET is 0 but Maximum PGA allocated is around 1 GB.
I hope, my question is clear that concept seems to be confusing where SGA_TARGET is 0 but ASSM is enabled and also PGA_AGGREGATE_TARGET is 0 but maximum PGA allocated is 1 GB.
Please revert with the reply to my query.
Regards972145 wrote:
Thanks for your reply but there is some confusion. ASMM is automatic shared memory management which seems to be similar to AMM which is automatic memory management. ASMM can be seen from OEM under Database Configuration->Memory Advisors. I guess, there is ASM which is automatic storage management to do with reduntant copies of data to provide fault tolerance.
ASMM - 10g setting for the automatic SGA using the parameter sga_target .
AMM - 11g setting for both SGA and PGA, uses the parameter memory_target
ASM - Automatic Storage Management, nothing to do with SGA or PGA
ASSM - Automatic Segment Space Management, for the tables and nothing to do with the PGA and SGA
Aman....
Edited by: Aman.... on Jan 21, 2013 3:53 PM corrected the typo -
Hi All,
OS:Windows 32 bit
RAM= 2GB
DB: Oracle 10.2.0.3
I am in a fix, my UAT server is used to run reports and it was running fine earlier but now due to a big java file , the report is not generated.
In my DB automatic SGA tuning is not enable and the SGA parameters are specified as below:
sga_max_size=1400M
Java_pool_size=32M
large_pool_size=104M
pga_aggregate_target=512M
Kindly tell me how to go about this as the RAM size of the UAT server is limited to 2GB and whether i should enable auto SGA tuning for the same, will this move help the cause?
BR
Sphinx
Edited by: $phinx19 on Aug 14, 2012 3:20 AMHi,
I tried increasing the size of java pool but i got the following error:
alter system set java_pool_size=104M scope=spfile;ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-04033: Insufficient memory to grow pool
So can you please tell me how to go about this?
Will enabling SGA_TARGET will help the cause or can I reduce some other parameter so that it can compensate for the increase in Java pool?
BR
Sphinx -
What are the side effects of setting "_object_statistics=false"?
Hi,
On a 10.2.0.3.0, due to frequent ORA-04031 errors, we have been recommended to set objectstatistics=false in init.ora and bounce the database.
Metalink Bug ID: 3519807
Going through the available documentation on net, I found that this parameter would have same effect as setting STATISTICS_LEVEL=BASIC or even worse.
Documentation (for statistics_level) says following options are affected.
* Automatic Workload Repository (AWR) Snapshots
* Automatic Database Diagnostic Monitor (ADDM)
* All server-generated alerts
* Automatic SGA Memory Management
* Automatic optimizer statistics collection
* Object level statistics
* End to End Application Tracing (V$CLIENT_STATS)
* Database time distribution statistics (V$SESS_TIME_MODEL and V$SYS_TIME_MODEL)
* Service level statistics
* Buffer cache advisory
* MTTR advisory
* Shared pool sizing advisory
* Segment level statistics
* PGA Target advisory
* Timed statistics
* Monitoring of statistics
We have daily schema statistics gathering schedule in place so I feel query performance should not be affected (of course, this is my assumption).
I just wanted to know what else would be affected due to this.
Thanks in advance.
Regards,Please let me know your ideas/inputs.
-
How to uninstall Oracle 11g Database Options?
I've come across a problem. A company that developed an application, installed Oracle 11g EE.
I guess they would use all default options. Some of them are licensed separately, and are not used. So I need to uninstall them.
For example, I see that it is installed "Advanced Compression". I tried to uninstall it from the Universal Installer, but there isn't an option.Good news for my company.
There has never been used "Advanced Compression" and for everything else we are licensed.
NAME VERSION DETECTED_USAGES CURRENTLY_USED LAST_USAGE_DATE
Active Data Guard - Real-Time Query on Physical Standby 11.2.0.2.0 0 FALSE
ADDM 11.2.0.2.0 0 FALSE
Advanced Replication 11.2.0.2.0 0 FALSE
Application Express 11.2.0.2.0 0 FALSE
Automatic SGA Tuning 11.2.0.2.0 0 FALSE
Automatic Storage Management 11.2.0.2.0 0 FALSE
Automatic Workload Repository 11.2.0.2.0 0 FALSE
AWR Baseline 11.2.0.2.0 0 FALSE
AWR Baseline Template 11.2.0.2.0 0 FALSE
Backup BASIC Compression 11.2.0.2.0 0 FALSE
Backup BZIP2 Compression 11.2.0.2.0 0 FALSE
Backup Encryption 11.2.0.2.0 0 FALSE
Backup HIGH Compression 11.2.0.2.0 0 FALSE
Backup LOW Compression 11.2.0.2.0 0 FALSE
Backup MEDIUM Compression 11.2.0.2.0 0 FALSE
Backup Rollforward 11.2.0.2.0 0 FALSE
Backup ZLIB Compression 11.2.0.2.0 0 FALSE
Baseline Adaptive Thresholds 11.2.0.2.0 0 FALSE
Baseline Static Computations 11.2.0.2.0 0 FALSE
Bigfile Tablespace 11.2.0.2.0 0 FALSE
Block Media Recovery 11.2.0.2.0 0 FALSE
Change Data Capture 11.2.0.2.0 0 FALSE
Change-Aware Incremental Backup 11.2.0.2.0 0 FALSE
Character Semantics 11.2.0.2.0 0 FALSE
Client Identifier 11.2.0.2.0 0 FALSE
Clusterwide Global Transactions 11.2.0.2.0 0 FALSE
Compression Advisor 11.2.0.2.0 0 FALSE
Crossedition Triggers 11.2.0.2.0 0 FALSE
CSSCAN 11.2.0.2.0 0 FALSE
Data Guard 11.2.0.2.0 0 FALSE
Data Mining 11.2.0.2.0 0 FALSE
Data Recovery Advisor 11.2.0.2.0 0 FALSE
Database Replay: Workload Capture 11.2.0.2.0 0 FALSE
Database Replay: Workload Replay 11.2.0.2.0 0 FALSE
Deferred Open Read Only 11.2.0.2.0 0 FALSE
Direct NFS 11.2.0.2.0 0 FALSE
Dynamic SGA 11.2.0.2.0 0 FALSE
Editioning Views 11.2.0.2.0 0 FALSE
Editions 11.2.0.2.0 0 FALSE
EM Database Control 11.2.0.2.0 0 FALSE
Encrypted Tablespaces 11.2.0.2.0 0 FALSE
Exadata 11.2.0.2.0 0 FALSE
Extensibility 11.2.0.2.0 0 FALSE
File Mapping 11.2.0.2.0 0 FALSE
Flashback Data Archive 11.2.0.2.0 0 FALSE
Flashback Database 11.2.0.2.0 0 FALSE
GoldenGate 11.2.0.2.0 0 FALSE
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Hybrid Columnar Compression 11.2.0.2.0 0 FALSE
Instance Caging 11.2.0.2.0 0 FALSE
Internode Parallel Execution 11.2.0.2.0 0 FALSE
Label Security 11.2.0.2.0 0 FALSE
Locator 11.2.0.2.0 0 FALSE
Long-term Archival Backup 11.2.0.2.0 0 FALSE
Materialized Views (User) 11.2.0.2.0 0 FALSE
Messaging Gateway 11.2.0.2.0 0 FALSE
Multi Section Backup 11.2.0.2.0 0 FALSE
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Object 11.2.0.2.0 0 FALSE
OLAP - Analytic Workspaces 11.2.0.2.0 0 FALSE
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Oracle Database Vault 11.2.0.2.0 0 FALSE
Oracle Java Virtual Machine (user) 11.2.0.2.0 0 FALSE
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Oracle Multimedia 11.2.0.2.0 0 FALSE
Oracle Multimedia DICOM 11.2.0.2.0 0 FALSE
Oracle Secure Backup 11.2.0.2.0 0 FALSE
Oracle Text 11.2.0.2.0 0 FALSE
Oracle Utility External Table 11.2.0.2.0 0 FALSE
Oracle Utility SQL Loader (Direct Path Load) 11.2.0.2.0 0 FALSE
PL/SQL Native Compilation 11.2.0.2.0 0 FALSE
Read Only Tablespace 11.2.0.2.0 0 FALSE
Real Application Clusters (RAC) 11.2.0.2.0 0 FALSE
Real-Time SQL Monitoring 11.2.0.2.0 0 FALSE
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Result Cache 11.2.0.2.0 0 FALSE
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RMAN - Tape Backup 11.2.0.2.0 0 FALSE
Rules Manager 11.2.0.2.0 0 FALSE
SecureFile Compression (system) 11.2.0.2.0 0 FALSE
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SQL Profile 11.2.0.2.0 0 FALSE
SQL Repair Advisor 11.2.0.2.0 0 FALSE
SQL Tuning Set (system) 11.2.0.2.0 0 FALSE
SQL Tuning Set (user) 11.2.0.2.0 0 FALSE
SQL Workload Manager 11.2.0.2.0 0 FALSE
Streams (system) 11.2.0.2.0 0 FALSE
Streams (user) 11.2.0.2.0 0 FALSE
Transparent Data Encryption 11.2.0.2.0 0 FALSE
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Undo Advisor 11.2.0.2.0 0 FALSE
Very Large Memory 11.2.0.2.0 0 FALSE
Workspace Manager 11.2.0.2.0 0 FALSE
XDB 11.2.0.2.0 0 FALSE
XStream In 11.2.0.2.0 0 FALSE
XStream Out 11.2.0.2.0 0 FALSE
XStream Streams 11.2.0.2.0 0 FALSE
ASO native encryption and checksumming 11.2.0.2.0 1 FALSE 20/10/12
Segment Advisor (user) 11.2.0.2.0 1 FALSE 08/03/13
SQL Tuning Advisor 11.2.0.2.0 2 FALSE 09/02/13
AWR Report 11.2.0.2.0 3 FALSE 09/02/13
Oracle Utility Datapump (Import) 11.2.0.2.0 3 FALSE 26/05/12
EM Performance Page 11.2.0.2.0 5 FALSE 20/10/12
SQL Monitoring and Tuning pages 11.2.0.2.0 5 FALSE 20/10/12
Job Scheduler 11.2.0.2.0 6 TRUE 13/04/13
Segment Shrink 11.2.0.2.0 6 TRUE 13/04/13
EM Grid Control 11.2.0.2.0 27 FALSE 15/03/13
Automatic SQL Execution Memory 11.2.0.2.0 35 TRUE 13/04/13
MTTR Advisor 11.2.0.2.0 41 TRUE 13/04/13
Parallel SQL DDL Execution 11.2.0.2.0 56 TRUE 13/04/13
Parallel SQL DML Execution 11.2.0.2.0 56 TRUE 13/04/13
Parallel SQL Query Execution 11.2.0.2.0 61 TRUE 13/04/13
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Oracle Utility Metadata API 11.2.0.2.0 93 TRUE 13/04/13
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Audit Options 11.2.0.2.0 96 TRUE 13/04/13
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Partitioning (system) 11.2.0.2.0 96 TRUE 13/04/13
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Import and Export header in CAUFVD
Hello all,
Can anyone tell me How to use Import and Export header for CAUFVD in function exit EXIT_SAPLCOZV_001 as my requirement is to populate overhead key automatically at the time of po order release. Do i have to use any function module ?? If yes then what and how?? I am new for enhancements so dont have much idea.
Thanks!!Hi bala,
Thanks for your prompt reply. But can you please ellaborate where excatly i need to wirte this export parameter. My code looks like this:
IF wa_caufvd-zschl EQ space.
"Overhead Key
SELECT matnr matkl FROM mara INTO CORRESPONDING FIELDS OF TABLE it_mara
WHERE matnr = wa_caufvd-matnr.
SELECT werks zschl
FROM zppoverhead
INTO CORRESPONDING FIELDS OF TABLE it_zppoverhead
FOR ALL ENTRIES IN it_mara
WHERE matkl = it_mara-matkl
AND werks = wa_caufvd-werks
AND auart = wa_caufvd-auart.
IF sy-subrc EQ 0.
wa_caufvd-zschl = wa_zppoverhead-zschl.
ENDIF.
ENDIF.
"Process Order Release
SELECT objid arbpl FROM crhd INTO CORRESPONDING FIELDS OF TABLE it_crhd
WHERE objid = wa_caufvd-st_arbid.
IF it_crhd IS NOT INITIAL.
SELECT werks zsubplant FROM zplantmaster INTO CORRESPONDING FIELDS OF TABLE it_zplantmaster
FOR ALL ENTRIES IN it_crhd
WHERE p_resource = it_crhd-arbpl.
ENDIF.
IF sy-subrc EQ 0.
wa_zpporders-zsubplant = wa_zplantmaster-zsubplant.
ENDIF.
As per my understanding i need to use export parameter for zschl, but how and where excatly.
Please guide me.
Thanks!! -
Use of Resource field on CK74N Additive Cost
We would like to enter an outside vendor code (not in SAP, so can't be validated) into the Resource field of a CK74N and be able to then see that carried over into the CK13N cost estimate display. Does anyone know what Item category could be used for this? Seems the Resource field has different uses based on the Item category.
The various item categories and what they represent. If you are considering buying material from the outside vendor, <b>you may use M</b>.
M (Material) B (Base planning object)
N (Service) L (Subcontracting)
E (Internal activity) F (External activity)
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I (Delivery costs) A (Co-product)
T (Text) P (Process costs manually)
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Can tablespace block size different from the database block size
I have a 10.2.0.3 database in Unix system.
I created a database used default block size of 8k. However, the client application requires 16k block size database. Can I work around to create a tablespace that has 16k block size instead of drop the database to recreate the database.
Thanks a lot!As Steven pointed out, you certainly can.
I would generally question, though, whether you should.
- Why does the application require 16k block sizes? If this is a custom application, it almost certainly doesn't really require 16k blocks. If this is a packaged application, it probably doesn't really require 16k blocks. If 16k blocks are a requirement for support, I would wager that having the application's objects in 16k block size tablespaces in a database with 8k blocks would not be supported.
- Mixing block sizes increases the management complexity of your database, potentially substantially. You need to specify a completely separate buffer cache for the 16k blocks, a buffer cache that would not be integrated with Oracle's automatic SGA management functionality. Figuring out how to split up the buffer cache between 8k and 16k blocks tends to be rather hard (particularly if the mix changes over time), which means that DBAs are going to be spending substantially more time managing the SGA in this sort of system than in a vanilla 10.2.0.3 system. And that DBAs will have many more opportunities to set things up incorrectly.
Justin -
Consistent Reads & Physical Reads
hi all,
what is Consistent Reads & Physical ReadsThere is no absolute value of the buffer cache hit ratio that is good or bad. The ratio value is first dependend on the application DML activity and the resources available and second is easily distorted (in either direction high or low) by poorly performing SQL. You can have a 99.9% hit ratio on a poorly performing database.
The Performance and Tuning Guide contains information on how to tune the db buffer cache and Oracle will tune the cache automatically if set it to do so with version 9.2 and up via automatic SGA memory management. The Guide errs to the old days of small OLTP environments. Significant number of hash joins and hash aggregation can result in a lower average ratio corresponding to a well performing database.
If you are using manual SGA memory management then you need to determine if the buffer pool is too small or if you think the pool size should be adequate then you need to hunt for the bad SQL (or in a non-OLTP environment just the cause of the low ratio value).
HTH -- Mark D Powell -- -
Tablespace creation with different block size
OS - rhel 4.3
kernel - 2.6.9
Oracle - 10.2
Hardware - IBM X series 346.
Defined block size for the db - 8kb.
Question: Can I create a tablespace with 16k?
regards,
LilyYou can create a tablespace with 16k blocks if, as Daljit suggests, you create a 16k block buffer cache.
I would, however, ask why you would want to create such a tablespace? The ability to have tablespaces with different block sizes in a single database was created primarily to allow the use of transportable tablespaces in situations where different databases had different block sizes. If you are trying to create a 16k block size for a different reason, there are a couple of things to be aware of
- While there are theories out there that tablespaces with different block sizes can have dramatic effects on performance, I've never seen any solid evidence that backs up this theory.
- Using different block sizes in the same database can significantly increase the complexity of managing a database. You'll have multiple buffer caches that you'll have to size, for example, automatic SGA management doesn't work with non-standard block size buffer caches, etc.
Justin -
RECOVER THE STRUTURES OF A DATABASE
I have a database that doesn't work , but i have all the files where the structures are into , is any way to put this structures in another database ??
Hi,
Well, read the error description, and fix :
Cause
If you enable automatic SGA Management by setting SGA_Target >0 and
if you are using db_block_buffers(Obsolete parameter) in your init.ora.
Startup of Database fails with ORA-00824 Error
Fix
Either you need to disable the Automatic SGA Mangement by setting SGA_Target=0
or Replace the db_block_buffers parameter with db_cache_size parameter
By the way, you didn't say your Oracle version...
I don't understand at all why you do not want restore the old parameters (before change)...
Nicolas. -
Career Advice reqd!!
I last year got my 8i DBA certification and unfortunately through circumstances have not been employed in an Oracle role. As a result I have forgotten most of what i learnt though i am sure its not completely gone from my memory banks.
I am hoping next year sometime to resurrect this DBA knowledge but am not sure how to go about it which is why i would like peoples advice. My first question is how does 8i differ from 9i and now 10g. Has the structure of the database changed radically? Obviously i will have to upgrade to 9i and then 10g but i am wondering how best to go about this.
I was thinking that i would go back through all my 8i notes and get my 8i practical skills up to speed before attemping the 9i upgrade. But since my goal is 9i & 10g will this be a waste if the database has gone through radical changes since 8i and if this is the case should i not just concentrate on passing the 9i upgrade exam and then 10g or are most of the principles of Oracle database design, tuning, B&R and netwk admin more or less still the same as what they were in 8i.
I am not trying to shortcut to 10g certification next year, i would rather get to know 10g thoroughly than maybe spend time worrying about an outdated 8i.
Any advice would be greatly appreciated
Gusoracle8i certfied have good lead on other new certified people because in oracle9i there are four paperes and know in oracle10g there are only two paperes for oracle DBA track. Moreover I want to tell you that employeer give prefrence to oracle7 certified people because they have very strong and in depth concept. although there are lot new technology come in oracle database but the work and knowledge of dba still same and there is no any considerable change. in oracle10g oracle introduce the concept of automatic sga but it is not very much effective as was stated by oracle and oracle10g still under work.
I will suggest you just recall your oracle8i dba course and try to work on oracle9i server I feel no perticular difference in oracle8i(8.1.7) and Oralce9i (9.2) -
Dear
Let me know that is it possible that Production Area Overhead and General Factory Overhead in BOM creation should be calculated automatically.
for Example:
we have Activity 1 in which we have Activity 2 in which QC Hours are
Lab =5Hr Lab =10Hr QC=5 Hrs
Machine=1Hr Machine=1Hr
Now our company policy is that Production area Overhead cost driver is sum of All activities Labour aand Machine Hrs
Production area OH=(51)(10+1)=17 Hrs
Now our company policy is that General Factory area Overhead cost driver is sum of All activities Labour aand Machine Hrs and QC Hrs
General Factory Overhead OH=(51)(101)5=22Hrs
So When i enter the value in all activties so is it possible that i should make or allow the Production area overhead and general Factory Overhead field automatically calcuated the Hrs instead of posting manually.
regards
AftabDear,
cannot understand your statement
"we have Activity 1 in which we have Activity 2 in which QC Hours are
Lab =5Hr Lab =10Hr QC=5 Hrs
Machine=1Hr Machine=1Hr "
pl explain the above.
Anyway any type of activity can be tackled in routing activity type difinition. and overhead by defining correct costing sheet.
pl explain your issue clearly so that i can help you. -
Creation of ASM instance.
hi all,
can any one help me out in this regard??
i have a DB in 10gR1 in normal file system. i want to convert this to ASM instance.
Is that first i need to create disk groups followed by adding the asm parameters in init.ora file and then bringing it up or what else the sequence????
can any one give the clear link for creating the disk groups and creation of an asm instance along the asm related init.ora parameters????
I am glad to have your help in this regard...Please look into Oracle Metalink Document I.D. Note:270065.1 (Use Automatic SGA Management).
Adith
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MacPro & Lion experiences same kernel_task problems as MBA
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