Bestpractice init.ora parameters for data warehouse in 10gR2

Hi,
We moved our 1Tera data warehouse database to linux 64 bit , 8 cpu , 8GB memory, with ASM (non RAC).
Could you please recommand best practice setting init.ora parameters in 10g
DW to achive the best performace ?
I set the following parameters:
parallel_adaptive_multi_user=TRUE
parallel_execution_message_size=2152
parallel_min_server=0
parallel_max_server=135
parallel_threads_per_cpu=2
db_file_multi_block_read_count=64
pga=900m
query_rewrite_enabled=true
star_transformation_enabled=true
db_block_size=32k
sga_target=3g
statistic_leve=typical
undo_management=auto
workarea_aize_policy=auto
db_cache_advice=on
disk_async_io=true
2. What setting would you recommand regrading the following parameters in DW (and ASM):
-- filesystemio_option :none | setall | directIO | asynch
Thank You.

You will get best practices from your production experiences and good advisors that oracle 10 has provided to you.
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14223/toc.htm

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Init.ora parameters for banking application

hi
i would like know guidelines for setting
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thanks

You will get best practices from your production experiences and good advisors that oracle 10 has provided to you.
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14223/toc.htm

Recommended init.ora values for PROD setup

Hi All,
-Assuming that I am using a 64-bit version of Oracle,
-that there is nothing else running on the server,
-that there will be no other databases on the server,
-that I have substantially more data on disk than I have RAM,
-and that I am using 11g. I want to setup a production database 11g. The server specs is OEL 5.6 with 12Gb Ram and a Quadcore CPU.
There will be 200 users simultaneously accessing the database. I understand that 10g and 11g are "self-tuning".
So in this regard do I need to still change values in the default init.ora?
Can you give me sample PROD template of your init.ora?
Or maybe since my RAM is 12Gb I will just set the "target SGA = 8Gb" and the database will now be good?
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Edited by: yxes2013 on 8.2.2013 16:21
Adding Justin's assumptions

I Thank you all :)
You need to understand what the memory is used for. Please read the documentation on SGA and PGA components and parameters and how they impact performance.Yeah I read it already....but it does not clearly explain like what all you did here ;)
Hmm interesting....I got lots of tips learned. So If I have 500Gb data (im sure it does not include index right?) Broken into the following:
Table1 300Gb
Table2 100Gb
Table3 50Gb
Table4 30Gb
Table5 10Gb
Table6 5Gb
Others 5Gb ( comprised of hundreds of tables)
Do I need to have my memory target SGA equal to 500Gb to attain a maximum performance? supposing memory is not a budget constraint?
Supposing Table6 is the most frequentlly read/accessed and I want to load/cache it all in the memory so I do not need to index this table, how can I do it?
What is the rule of thumb of PGA size against the size of the table? Maybe 20% sorting of the most accessed table?
@Justin
**10 sessions doing data warehouse queries will probably need more PGA than 1000 sessions doing OLTP queries.
**I'd probably start with a MEMORY_TARGET of 10 or 11G. How about the approx. PGA size dear? :)
@Hemant
It is more the amount of data and some factoring for the number (volume) of changes to the data.
The number of users matters in terms of sizing memory for server processes, and some allocation of the SHARED_POOL_SIZE, not for the DB_CACHE_SIZE component.
If more users means more distinct SQL statements, the SHARED_POOL_SIZE usage would be greater.
However, multiple users accessing the same version of the data will be "sharing" one buffer in memory for each block of data being accessed. It doesn't matter if 1 user is reading a block or 8 or 64 or 128 users are reading the same block -- in either case it is one buffer in memory.
It is only if the block is frequently being changed and concurrently queried, might there be current and a few consistent versions of the buffer being maintained in the SGA.I think in 11g I do not need to set those because it is "self-tuning" right? All I need is the target SGA size. :)
Given that I will perform a "benchmark" test/simulation on the DEV server. Is there a tool that will gather the right sizing of init.ora parameters? Can I extract it from AWR report?
Thanks to all again,
Yxz

Init.ora parameters

Hi,
Which init.ora parameters are respond for write data from cache to redo logs files? It is possible to set this parameter as time or rather for cache usage?

Dear,
The purpose of redo generation is to ensure recoverability. This is the reason why, Oracle does not give the DBA a lot of control over redo generation. If the instance crashes, then all the changes within SGA will be lost. Oracle will then use the redo entries in the online redo files to bring the database to a consistent state.
Best Regards,
Francisco Munoz Alvarez
www.oraclenz.com

Control parameters for data transfer

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How does it have an influence on loading data?

Hi,
Maximum size of a data packet in kilo bytes
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Recommendation
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Maximum number of parallel processes for data transfer
Select a number greater than 0.
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Setting of init.ora file for 500 users

how to set diffrents parameters in init.ora file
for 500 user
(hybrid system)(oltp+dss)
thanks

Yeah, it depends and you will need to adjust thoses parameters during the "life" of the database.
I give you some of my thoughts (that's just thoughts, not a rule => there is no perfect rule) :
500 users = Unix box i guess so :
If MTS (dont think u need MTS for 500 users) => SGA = 75% of the RAM of the server
If NOT MTS (dedicated processes) => SGA = 50% of the RAM
Say 2GB of RAM on no MTS :
buffer cache = 900 MB
shared pool = 100MB to 200 MB
sort_area_size = 256KB
something like 50 to 100 RBS (depends on how many users are connected simultaneously)
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all the tablespaces LOCALLY MANAGED
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Are there any init.ora parameters which can't be changed at all ?

DB version: 11gR2
We have the following two types of initialization parameters
Dynamic - Which can be changed without a DB bounce (example CURSOR_SHARING)
Static - Which can be changed only with a DB bounce (example MEMORY_MAX_TARGET )
Both types of init parameters mentioned above can be changed with or without a DB bounce. Are there any initialization parameters which cannot be changed at all with or without a DB bounce?

Max wrote:
Oracle documentation which describes init.ora parameters is 'Oracle Database Reference 11gRelease 2'. It doesn't answer my question
Maybe it does.
from DB_BLOCK_SIZE
The value for DB_BLOCK_SIZE in effect at the time you create the database determines the size of the blocks. The value must remain set to its initial value.

Evolution of init.ora parameters

Hi Gurus,
Can someone name the milestones (or important) in the evolution of parameters in init.ora file. I knew for every release certain parameters are relegated, or replaced and few are introduced as new and ofcourse for some the default values are changed. I want to understand the most important changes Oracle has come up at 8i, 9i, 10g and 11g releases.
Regards,
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For your reference on Oracle Initialization Parameters.
Oracle 7 - List of Initialization Parameters
http://download.oracle.com/docs/cd/A57673_01/DOC/server/doc/SAD73/ch2.htm#Parameters
Oracle 8i - List of Initialization Parameters
http://www.oracle.com/pls/tahiti/tahiti.initora
Oracle 9i - List of Initialization Parameters
http://www.oracle.com/pls/db92/db92.initora?remark=homepage
Oracle 10g - List of Initialization Parameters
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams.htm#g1195420
Oracle 11g - List of Initialization Parameters
http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/initparams.htm#g1195420
Oracle Metalink Notes on Initialization Parameters
Note ID: 268581.1 - Obsolete / Deprecated Initialization Parameters in 10G
Oracle EBS Applications:
Note ID: 216205.1 - Database Initialization Parameters for Oracle Applications Release 11i
Note ID: 396009.1 - Database Initialization Parameters for Oracle Applications Release 12
Note ID: 100709.1 Subject: Top 8 init.ora Parameters Affecting Performance
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Are there any timesten installation for data warehouse environment?

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Adi,
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Data Access Object for Data Warehouse?

Hi,
Does anyone know how the DAO pattern looks like when it is used for a data warehouse rather than a normal transactional database?
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The DAO implementation for a data warehouse would be based on the model of the databases. However the tables are set up, that is how the DAO is coded.

RMAN crosscheck and expire guidelines for data warehouse environment

O/S: Windows Server 2008
DB: Oracle 11gR2
Are there any guidelines to how often one should do a RMAN crosscheck and set an expiration on archivelogs for data warehouse environments?
It would seem once a day would be enough for the crosscheck in a data warehouse environment that gets refreshed nightly. Expiration I would expect no less than 1 week.
Cheers!

I agree with damorgan
refer the below links for best practices.
http://www.oracle.com/technetwork/database/features/availability/311394-132335.pdf
https://blogs.oracle.com/datawarehousing/entry/data_warehouse_in_archivelog_m
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http://www.oracleracepxert.com
Understand the Power of Oracle RMAN
http://www.oracleracexpert.com/2011/10/understand-power-of-oracle-rman.html
Duplicating RAC database using RMAN
http://www.oracleracexpert.com/2009/12/duplicate-rac-database-using-rman.html

RAC for Data Warehouse

Hello,
We have a research project for restructructuring our data warehouse system.
I would like to get some opinions about whether RAC architecture can be
a good solution for Data Warehouse application.
We have using parallel queries massively. Does running these kind of queries
on different servers on RAC with multiple server result in performance degradation rather than
running on single monolithic server with multiple CPUs
I will appreciate any comments using RAC architecture for Data Warehouse
systems?
Regards,

Maurice Muller wrote:
Just keep in mind that during the last 4 years (I guess your current system is about 4 years old) the CPUs became much faster.
A cpu can't work without data which means that the I throughput has to be fast enough to feed all your cores with data.
The main bottleneck of all DWHs I have seen during the last 8 years was allways the IO never the CPUs. And not just data warehousing Maurice, but a basic principle for any data processing platform - the slowest layer is always the I/O layer.. and can be the most expensive one to solve too.
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You can also replace a dual core dual CPU nodes with a 6 core AMD Istanbul CPUs next year.. and possibly 12 core CPUs year after that. So even a smallish 4 node cluster with 16 cores in total can be grown significantly and remain a 4 node cluster. Together with advances in HPC (High Performance Computing) like Infiniband.
I'm not seeing much use of non-RAC RDBMS architecture in the future. Databases are getting ever bigger because we have the technology to crunch more data, and crunch it a lot more intelligently than ever before. My first production database was 4MB in size, and ran on a Novell File Server with two 20MB disks. I'm currently testing a 24TB array for use for a single database.
Technology is inevitable, as is the growth in data volumes. And I cannot see a non-RAC architecture rising to that challenge. Especially not in something like data warehousing.

Are analytic functions usefull only for data warehouses?

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I deal with reporting queries on Oracle databases but I don't work on Data Warehouses, thus I'd like to know if learning to use analytic functions (sql for anaylis such as rollup, cube, grouping, ...) might be usefull in helping me to develop better reports or if analytic functions are usually usefull only for data warehouses queries. I mean are rollup, cube, grouping, ... usefull also on operational database or do they make sense only on DWH?
Thanks!

Mark1970 wrote:
thus does it worth learning them for improving report queries also not on DHW but on common operational databases?Why pigeonhole report queries as "+operational+" or "+data warehouse+"?
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Data processing and data reporting requirements not not care what label you assign to your database.
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Oracle 9i vs Oracle11gR2 init.ora parameters

Hi,
Can you please let me know what are the added init.ora parameters in oracle11gR2 than when compared to oracle9i init.ora prams?
Thanks
KSG

Hi;
Can you please let me know what are the added init.ora parameters in oracle11gR2 than when compared to oracle9i init.ora prams?Lots of thing have been changed those 2 produtc, bacily 11g parameter perform more flexsibility.I belive its hard to define what exactly changed. Please see below links:
9i init:
http://www.oracle-base.com/articles/9i/PersistentInitializationParameters.php
http://ss64.com/ora/syntax-initora.html
http://www.scribd.com/doc/2166874/Initialization-Parameters-in-oracle-9i
11ginit:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28310/create005.htm
http://kevinclosson.wordpress.com/2007/08/27/oracle-database-11g-initialization-parameters-a-digest/
Regard
Helios

Example database for data warehouse

Hi!
Does anybody know where can be found exaple database for data warehouse?
- schema is good
- schema with data is better
Best regards

slkLinuxUser wrote:
Hi!
Does anybody know where can be found exaple database for data warehouse?
- schema is good
- schema with data is better
Best regardsJust like an OLTP database, the schema design and its data is 100% dependant on the business needs and (if done properly) the result of a thorough data analysis. Any kind of a pre-designed sample would be near worthless to any actual application.

Bestpractice init.ora parameters for data warehouse in 10gR2

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