Check physical block size on windows

Hi All
how to check physical block size on windows 2008 R2
got the solution
thanks
Edited by: 912919 on 04-Oct-2012 03:16

912919 wrote:
G:\app\testuser\product\11.2.0\dbhome_1\BIN>fsutil fsinfo ntfsinfo f:
NTFS Volume Serial Number : 0x50967d40967d279c
Version : 3.1
Number Sectors : 0x0000000046da27ff
Total Clusters : 0x0000000008db44ff
Free Clusters : 0x0000000008917ae3
Total Reserved : 0x0000000000000000
Bytes Per Sector : 512
Bytes Per Cluster : 4096Bytes Per FileRecord Segment : 1024
Clusters Per FileRecord Segment : 0
Mft Valid Data Length : 0x0000000002b00000
Mft Start Lcn : 0x00000000000c0000
Mft2 Start Lcn : 0x0000000000000002
Mft Zone Start : 0x00000000000c2b00
Mft Zone End : 0x00000000000cf300
RM Identifier: F2719D9E-5DAB-11E1-8418-001B21D86903
Can i create block of 16K for Oracle database 11gI give up.
Can you?
Why do you want to create block of 16k for Oracle database?

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How get os physical block size ?

man dd, it advice bs parameter be a multiple of the physical block size .
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Specifies both the input and output block size, superseding the ibs and obs flags. The block size values
specified with the bs flag must always be a multiple of the physical block size for the media being used.

Learning new things today, thanks guys!
$ printf "a" >1bytefile.txt && echo $(( 512 * $(du 1bytefile.txt | cut -f1) )) && rm 1bytefile.txt
1024
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SQL*Plus: Release 10.2.0.4.0 - Production on Tue Jul 24 16:15:04 2012
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SYS@TTST> select
2    max(l.lebsz) log_block_size
3 from
4    sys.x$kccle l
5 where
6    l.inst_id = userenv('Instance');
LOG_BLOCK_SIZE
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With the Partitioning, OLAP, Data Mining and Real Application Testing options
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/dev/vg01/lvol04: Permission denied
$ su
Password:
# /usr/sbin/fstyp -v /dev/vg01/lvol04
vxfs
version: 5
f_bsize: 8192
f_frsize: 1024
f_blocks: 786432000
f_bfree: 87190098
f_bavail: 81740717
f_files: 22035604
f_ffree: 21797524
f_favail: 21797524
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f_namemax: 254
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Checking exact File Size irrespective of OS - Windows / Unix / Linux ?

Hi All,
When i check the file size in windows and also the same file in linux - it is not same. for example a client may be a windows machine and the server may be a unix machine.
Is there is a any generic method to check the file size which may be same for ALL OS ?
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Kathir

It is a text file and also as well as binary...
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OS block size

Hi
How to check OS block size in LINUX and Windows.
Regards

But as a oracle dba one should know how to find/know the os block size to set proper value for the
db_block_size oracle initialization parameter.http://www.lmgtfy.com/?q=ext3+block+size
Once you know OS block size, what formula is used "to set proper value for the db_block_size oracle initialization parameter"?
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How to find block size in OS

I know db_block_size and db_file_multiblock_read_count of Oracle should be multiple of OS(operationg System).
Can anybody suggest me , how can i find out block size in window or Linux.
Thanks in advance
Tinku

$show parameter db_block_size this is the setting from your init.ora file.
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In linux system use
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In my case it was 4k so my db_block_size will be multiples of 4k.
http://www.dizwell.com/html/db_block_size.html
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Gopal
visit
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Concerning oracle single block io call and os block size!!

Hi, all
The block size of my db(10gr2) is 8k, and
the db is on the raw device file system on a aix machine.
OS block size is 512k.
How much block will be read from disk when a single oracle io call occurs?
Which one is currect, 8K or 512K?
If the block size for a single io call depends on the os block size (512k),
I think os block size need to be tuned for oracle block size (8k).
If we use raw device file system, os level block size has no meaning??
Thanks in advance.
Best Regards.

Hi,
Please refer to the following oracle doc:
http://docs.oracle.com/cd/B28359_01/server.111/b32009/appa_aix.htm
extract from it:
Setting the Database Block Size
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We are currently setting up an Oracle 11G instance on a Windows 2008 R2 server and were looking to see if there was an optimal NTFS block size. I've read the following: http://docs.oracle.com/cd/E11882_01/win.112/e10845/specs.htm
But it only mentioned the block sizes that can be used (2k - 16k). And basically what i got out of it, was the different block szes affect the max # of database files possible for each database.
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How to install 10g database on windows with db block size 16k

Hi,
Can somone help me install oracle 10g database on windows xp with db block size as 16k.
i need this database, because it is one of the recommendations for insalling OWB(Oracle Warehouse Builder).
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1) In Initialization parameter pile
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Block Size 8K/16K
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My Windows 2003 crashed which was running Oracle XE.
I installed Oracle XE on Windows XP on another machine.
I coped my D:\oracle\XE10g\oradata folder of Win2003 to the same location in WinXP machine.
When I start the database in WinXP using SQLPLUS i get the following message
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Database Buffers 79691776 bytes
Redo Buffers 2904064 bytes
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Hi Zulqarnain,
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Cannot set Block Size

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When I tried to create a database 11g using DBCA, I noticed the tool did not allow me to select the block size. It was automtically set to 8KB without being able to modify it.
 
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os: windows xp sp2

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~ Madrid

Transaction execution time and block size

Hi,
I have Oracle Database 11g R2 64 bit database on Oracle Linux 5.6. My system has ONE hard drive.
Recently I experimented with 8.5 GB database in TPC-E test. I was watching transaction time for 2K,4K,8K Oracle block size. Each time I started new test on different block size, I would created new database from scratch to avoid messing something up (each time SGA and PGA parameters ware identical).
In all experiments a gave to my own tablespace (NEWTS) different configuration because of oracle block-datafile size limits :
2K oracle block database had 3 datafiles, each 7GB.
4K oracle block database had 2 datafiles, each 10GB.
8K oracle block database had 1 datafile of 20GB.
Now best transaction (tranasaction execution) time was on 8K block, little longer tranasaction time had 4K block, but 2K oracle block had definitly worst transaction time.
I identified SQL query(when using 2K and 4K block) that was creating hot segments on E_TRANSACTION table, that is largest table in database (2.9GB), and was slowly executed (number of executions was low compared to 8K numbers).
Now here is my question. Is it possible that multiple datafiles are reasone for this low transaction times. I have AWR reports from that period, but as someone who is still learning things about DBA, I would like to asq, how could I identify this multi-datafile problem (if that is THE problem), by looking inside AWR statistics.
THX to all.

>
It's always interesting to see the results of serious attempts to quantify the effects of variation in block sizes, but it's hard to do proper tests and eliminate side effects.
I have Oracle Database 11g R2 64 bit database on Oracle Linux 5.6. My system has ONE hard drive.A single drive does make it a little too easy for apparently random variation in performance.
Recently I experimented with 8.5 GB database in TPC-E test. I was watching transaction time for 2K,4K,8K Oracle block size. Each time I started new test on different block size, I would created new database from scratch to avoid messing something up Did you do anything to ensure that the physical location of the data files was a very close match across databases - inner tracks vs. outer tracks could make a difference.
(each time SGA and PGA parameters ware identical).Can you give us the list of parameters you set ? As you change the block size, identical parameters DON'T necessarily result in the same configuration. Typically a large change in response time turns out to be due to changes in execution plan, and this can often be associated with different configuration. Did you also check that the system statistics were appropriately matched (which doesn't mean identical cross all databases).
In all experiments a gave to my own tablespace (NEWTS) different configuration because of oracle block-datafile size limits :
2K oracle block database had 3 datafiles, each 7GB.
4K oracle block database had 2 datafiles, each 10GB.
8K oracle block database had 1 datafile of 20GB.If you use bigfile tablespaces I think you can get 8TB in a single file for a tablespace.
Now best transaction (tranasaction execution) time was on 8K block, little longer tranasaction time had 4K block, but 2K oracle block had definitly worst transaction time.We need some values here, not just "best/worst" - it doesn't even begin to get interesting unless you have at least a 5% variation - and then it has to be consistent and reproducible.
I identified SQL query(when using 2K and 4K block) that was creating hot segments on E_TRANSACTION table, that is largest table in database (2.9GB), and was slowly executed (number of executions was low compared to 8K numbers).Query, or DML ? What do you mean by "hot" ? Is E_TRANSACTION a partitioned table - if not then it consists of one segment, so did you mean to say "blocks" rather than segments ? If blocks, which class of blocks ?
Now here is my question. Is it possible that multiple datafiles are reasone for this low transaction times. I have AWR reports from that period, but as someone who is still learning things about DBA, I would like to asq, how could I identify this multi-datafile problem (if that is THE problem), by looking inside AWR statistics.On a single disc drive I could probably set something up that ensured you got different performance because of different numbers of files per tablespace. As SB has pointed out there are some aspects of extent allocation that could have an effect - roughly speaking, extents for a single object go round-robin on the files so if you have small extent sizes for a large object then a tablescan is more likely to result in larger (slower) head movements if the tablespace is made from multiple files.
If the results are reproducible, then enable extended tracking (dbms_monitor, with waits) and show us what the tkprof summaries for the slow transactions look like. That may give us some clues.
Regards
Jonathan Lewis

Finding appropriate block size?

Hi All,
I believe this might be basic question, How to find appropriate block size for building an database to an specific application?
I had seen always default 8K block size is used every where(Around 300-350 databases i have seen till now)....but why and how do they estimate this block size blindly before creating production database.
Also in the same way how memory settings are finalized before creating database?
-Yasser

Yasser,
I have been very fortunate to buy and read several very high quality Oracle books which not only correctly state the way something works, but also manage to provide a logical, reasoned explanation for why things happen as they do, when it is appropriate, and when it is not. While not the first book I read on the topic of Oracle, the book “Oracle Performance Tuning 101” by Gaja Vaidyanatha marked the start of logical reasoning in performance tuning exercises for me. A couple years later I learned that Gaja was a member of the Oaktable Network. I read the book “Expert Oracle One on One” by Tom Kyte and was impressed with the test cases presented in the book which help readers understand the logic of why Oracle behaves as it does, and I also enjoyed the performance tuning stories in the book. A couple years later I found Tom Kyte’s “Expert Oracle Database Architecture” book at a book store and bought it without a second thought; some repetition from his previous book, fewer performance tuning storing, but a lot of great, logically reasoned information. A couple years later I learned that Tom was a member of the Oaktable Network. I read the book “Optimizing Oracle Performance” by Cary Millsap, a book that once again marked a distinct turning point in the method I used for performance tuning – the logic made all of the book easy to understand. A couple years later I learned that Cary was a member of the Oaktable Network. I read the book “Cost-Based Oracle Fundamentals” by Jonathan Lewis, a book by its title seemed to be too much of a beginner’s book until I read the review by Tom Kyte. Needless to say, the book also marked a turning point in the way I approach problem solving through logical reasoning, asking and answering the question – “What is Oracle thinking”. Jonathan is a member of the Oaktable Network, a pattern is starting to develop here. At this point I started looking for anything written in book or blog form by members of the Oaktable Network. I found Richard Foote’s blog, which some how managed to make Oracle indexes interesting for me - probably through the use of logic and test cases which allowed me to reproduce what I reading about. I found Jonathan Lewis’ blog, which covers so many interesting topics about Oracle, all of which leverage logical approaches to help understanding. I also found the blogs of Kevin Closson, Greg Rahn, Tanel Poder, and a number of other members of the Oaktable Network. The draw to the performance tuning side of Oracle administration was primarily for a search for the elusive condition known as Compulsive Tuning Disorder, which was coined in the book written by Gaja. There were, of course, many other books which contributed to my knowledge – I reviewed at least 8 of the Oracle related books on the amazon.com website.
Motivation… it is interesting to read what people write about Oracle. Sometimes what is written directly contradicts what one knows about Oracle. In such cases, it may be a fun exercise to determine if what was written is correct (and why it is logically correct), or why it is wrong (and why it is logically incorrect). Take, for example, the “Top 5 Timed Events” seen in this book (no, I have not read this book, I bumped into it a couple times when performing Google searches):
http://books.google.com/books?id=bxHDtttb0ZAC&pg=PA17#v=onepage&q=&f=false
The text of the book states that the “Top 5 Timed Events” shown indicates a CPU Constrained Database (side note: if a database is a series of files stored physically on a disk, can it ever be CPU constrained?). From the “Top 5 Timed Events”, we see that there were 4,851 waits on the CPU for a total time of 4,042 seconds, and this represented 55.76% of the wait time. Someone reading the book might be left thinking one of:
* “That obviously means that the CPU is overwhelmed!”
* “Wow 4,851 wait events on the CPU, that sure is a lot!”
* “Wow wait events on the CPU, I didn’t know that was possible?”
* “Hey, something is wrong with this ‘Top 5 Timed Events’ output as Oracle never reports the number of waits on CPU.”
* “Something is really wrong with this ‘Top 5 Timed Events’ output as we do not know the number of CPUs in the server (what if there are 32 CPUs), the time range of the statics, and why the average time for a single block read is more than a second!”
A Google search then might take place to determine if anyone else reports the number of waits for the CPU in an Oracle instance:
http://www.google.com/search?num=100&q=Event+Waits+Time+CPU+time+4%2C851+4%2C042
So, it must be correct… or is it? What does the documentation show?
Another page from the same book:
http://books.google.com/books?id=bxHDtttb0ZAC&pg=PA28#v=onepage&q=&f=false
Shows the command:
alter system set optimizer_index_cost_adj=20 scope = pfile;Someone reading the book might be left thinking one of:
* That looks like an easy to implement solution.
* I thought that it was only possible to alter parameters in the spfile with an ALTER SYSTEM command, neat.
* That command will never execute, and should return an “ORA-00922: missing or invalid option” error.
* Why would the author suggest a value of 20 for OPTIMIZER_INDEX_COST_ADJ and not 1, 5, 10, 12, 50, or 100? Are there any side effects? Why isn’t the author recommending the use of system (CPU) statistics to correct the cost of full table scans?
A Google search finds this book (I have not read this book either, just bumped into it during a search) by a different author which also shows that it is possible to alter the pfile through an ALTER SYSTEM command:
http://books.google.com/books?id=ufz5-hXw2_UC&pg=PA158#v=onepage&q=&f=false
So, it must be correct… or is it? What does the documentation show?
Regarding the question of updating my knowledge, I read a lot of books on a wide range of subjects including Oracle, programming, Windows and Linux administration, ERP systems, Microsoft Exchange, telephone systems, etc. I also try to follow Oracle blogs and answer questions in this and other forums (there are a lot of very smart people out there contributing to forums, and I feel fortunate to learn from those people). As long as the book or blog offers logical reasoning, it is fairly easy to tie new material into one’s pre-existing knowledge.
Charles Hooper
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.

ORA-27046: file size is not a multiple of logical block size

Hi All,
Getting the below error while creating Control File after database restore. Permission and ownership of CONTROL.SQL file is 777 and ora<sid>:dba
ERROR -->
SQL> !pwd
/oracle/SID/sapreorg
SQL> @CONTROL.SQL
ORACLE instance started.
Total System Global Area 3539992576 bytes
Fixed Size 2088096 bytes
Variable Size 1778385760 bytes
Database Buffers 1744830464 bytes
Redo Buffers 14688256 bytes
CREATE CONTROLFILE SET DATABASE "SID" RESETLOGS ARCHIVELOG
ERROR at line 1:
ORA-01503: CREATE CONTROLFILE failed
ORA-01565: error in identifying file
'/oracle/SID/sapdata5/p11_19/p11.data19.dbf'
ORA-27046: file size is not a multiple of logical block size
Additional information: 1
Additional information: 1895833576
Additional information: 8192
Checked in target system init<SID>.ora and found the parameter db_block_size is 8192. Also checked in source system init<SID>.ora and found the parameter db_block_size is also 8192.
/oracle/SID/102_64/dbs$ grep -i block initSID.ora
Kindly look into the issue.
Regards,
Soumya

Please chk the following things
1.SPfile corruption :
Startup the DB in nomount using pfile (ie init<sid>.ora) create spfile from pfile;restart the instance in nomount state
Then create the control file from the script.
2. Check Ulimit of the target server , the filesize parameter for ulimit shud be unlimited.
3. Has the db_block_size parameter been changed in init file by any chance.
Regards
Kausik

Check physical block size on windows

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