How to calculate the partition size in range partition,by value
hi all,
The primary key is number for the table.
I have 5543201 records in a table.
If I want to break them in 7 equal partition as per the primary key,how do i achieve this?
rgds
s
I probably don't understand it...but I would say:
5543201/7=791886
range 1 : 0....791886 (1x 791886)
range 2 : 791887....1583772 (2 x 791886)
range 3 : 1583773 .... (3 x 781886)
tange 4 : ......
HoweverI doubt whether this is a smart aproach for partitioning.
I would say that a patitioning on date, or some key-value is more applicable.
But hey...I don't know the further requirements.
Cheers Martijn
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Hi,
I am having a table of 4 column. First column is varchar2(10), Second column is Number(5), Third column is char(10) and Fourth column is Number(12,2).
Now how to calculate the size of each row. I want to know how much space it will take for each row.
Thanx & Regards,
SwarupFor a complete discussion of storage requirements for different datatypes see the Oracle 8i Concepts manual.
All Oracle documentation is available on-line via the 'Documentation' link on the OTN home page.
Your Col2 NUMBER(5) will take 4 bytes if it holds a 5 digit positive or negative number.
Your Col4 NUMBER(12,2) will take 7 bytes if it holds a number with 12 digits that is positive and will take 8 bytes if it holds a number with 12 digits that is negative.
The following is from the Concepts manual Chapter 12 (Copyright by Oracle)
Built-In Datatypes 12-9
Internal Numeric Format
Oracle stores numeric data in variable-length format. Each value is stored in
scientific notation, with one byte used to store the exponent and up to 20 bytes to
store the mantissa. The resulting value is limited to 38 digits of precision. Oracle
does not store leading and trailing zeros. For example, the number 412 is stored in a
format similar to 4.12 x 10 2 , with one byte used to store the exponent (2) and two
bytes used to store the three significant digits of the mantissa (4, 1, 2). Negative
numbers include the sign in their length.
Taking this into account, the column size in bytes for a particular numeric data
value NUMBER ( p), where p is the precision of a given value, can be calculated
using the following formula:
ROUND((length( p)+ s)/2))+1
where s equals zero if the number is positive and s equals 1 if the number is
negative.
Zero and positive and negative infinity (only generated on import from Version 5
Oracle databases) are stored using unique representations. Zero and negative
infinity each require one byte; positive infinity requires two bytes.
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Dear all.
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Itemization for material 600000-000000-0012 in plant 1000
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ItmNo
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1
E
J0103033 WC1 A03
1001
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CAR
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Cheers !
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1 E J0103033 WC1 A03 1001 14,400.00 7,200.00 CNY 3,600 CAR
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3 E J0103033 WC1 A02 1001 14,400.00 7,200.00 CNY 3,600 CAR
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7 G CC_AT01 41000001 41000001 2.25 0.00 CNY -
Guys,
Please can you tell me how to find the partition name from the table for say today ("SYSDATE") assuming that the table is partitioned by Date ( monthly )
ie,
I need to find the partition belonging to the current month, on which i am working
Thanks
GBased on martina's suggestion (can be of course improved, maxvalue should be handled as well):
SQL> create table p(id number,time_stamp date)
2 partition by range(time_stamp)
3 (
4 partition p1 values less than(date '2007-10-01'),
5 partition p2 values less than(date '2007-11-01'),
6 partition p3 values less than(date '2007-12-01'),
7 partition p4 values less than(date '2008-01-01'),
8 partition p5 values less than(date '2008-02-01'),
9 partition p6 values less than(date '2008-03-01')
10 )
11 /
Table created.
SQL> create or replace function date_from_long(p_tabname varchar2,
2 p_partname varchar2)
3 return date is
4 l_long long;
5 l_date date;
6 begin
7 select high_value
8 into l_long
9 from user_tab_partitions
10 where table_name = p_tabname
11 and partition_name = p_partname;
12 if substr(l_long, 1, 7) = 'TO_DATE' then
13 execute immediate 'select ' || l_long || ' from dual'
14 into l_date;
15 return l_date;
16 else
17 return null;
18 end if;
19 end;
20 /
Function created.
SQL> select table_name,partition_name,
2 date_from_long(table_name,partition_name) high_value
3 from user_tab_partitions
4 where table_name='P'
5 order by 3
6 /
TABLE_NAME PARTITION_NAME HIGH_VALUE
P P1 01.10.2007 00:00:00
P P2 01.11.2007 00:00:00
P P3 01.12.2007 00:00:00
P P4 01.01.2008 00:00:00
P P5 01.02.2008 00:00:00
P P6 01.03.2008 00:00:00
6 rows selected.
SQL> select
2 max(partition_name)
3 keep
4 (dense_rank first order by date_from_long(table_name,partition_name)) part_name
5 from user_tab_partitions
6 where table_name='P' and date_from_long(table_name,partition_name)>=sysdate
7 /
PART_NAME
P2Best regards
Maxim -
How to make the Partition on my laptop hard disc
Dear Sir
I purchased new HP lap top, I would like to partition on my hard disc.
Please give me the suggestion for how to take the back up for my new laptop its necessary or not and how to create the partition on my hard disc System information
i5 second generation
Windows dome premium 64 bit
Hard disc size 640gb
4gb ram
Thanks and Regards
SathishPerfect Solution to Problem:
Precautions:
1.Create your recovery DVD's from recovery partition before proceding, or order them from hp so as in case of any error or in worst case system can be set to factory restore.
2.BACK UP YOUR DATA.
3.FOLLOW ON YOUR OWN RISK , NO RESPONSIBILTY FOR DATA LOSS , SYSTEM CRASH, OR LOSS OF RECOVERY PARTITION.
4.Hopefully you have read this , if any consequences arises take it on your part , nothing to do with it, you can leave the rest of reding part if not ready,
THANKS FOR READING........
OOP'S you are here,,,,,,,,,then lets continue at your risk..........
Statement:
You are using this guide at your own risk. I don't take any responsibility for any problems.
Important informations !
Before you will do anything please create a set of recovery discs and back up all important data.
Both these steps will save you a lot of troubles if something will go wrong.
Resource:
From experience
Remember that if you will decide to use the recovery discs or the F11 option to restore the PC to its originalcondition, all partitions which were created by you will be lost and all the data which were stored on them willalso be lost.
Introduction:
Below screenshot shows pre-configured partitions on HP notebook with pre-loaded Windows 7.
As you see mounted HDD has four primary partitions:
C - partiton with the operating system.
HP_TOOLS - partition which allow to use diagnostic tools after pressing F2 on startup.
RECOVERY - partiton which allows to recover system by pressing F11 on startup.
SYSTEM - active partition which boots the operating system.
Here begins our problem. A standard partition table is only able to store information about four partitions.
This means that a hard disk could have a maximum of four partitions. The four standard partitions are oftencalled the primary partitions.
To deal with this limitation we may:
----> Delete hp tools partiton , and create new logical partion, BUT RECOVERY MEDIA SET HAVE BEENCREATED BEFORE......
PROCESS:
Note:
Please perform each operation individually.
Using several operations at one time may end with fatal error.
1.Hope you have your recovery media , recovery media dvd set and DRIVER DVD,if not then please get it first for safety..
2. Download and install MiniTool Partition Wizard Home Edition.
3.Please back all of your data on HARDDISK before proceding.......
4.Go to START> COMPUTER > RIGHT CLICK ON IT > MANAGE
5.A window opens, select disk management from it , given on left hand side....
6.It will display your harddisk partitions as displayed in image.....carefully locate HP_TOOLS Partition in given table.....
7.Right click on HP_TOOLS Partition and Delete it.........it will prompt for response say yes.........
8.Now must have left with 3 partitons.........HP_TOOLS have been deleted...
9.Now action time...........
10.Start Minitool Partition wizard.......it will diaplay your partitons.........select C: partition......right click on it .....select option move/resize...
11.New dialog box appears displays currents stats use the drag corners on top to reduce size for C: drive ......set the new size according to use..........But new size must not be less than 150 gb to avoid any data loss.....
12.leave rest of options intact.........click ok...........this will return you to minitool partiton wizrd home screen........click on apply at leftmost top corner..........it asks for permission say yes........then it displays that drive is in use you need to restart............
13.Click on Restart Computer........
14.Your Computer will restart in Mini tool partition boot mode dont press any key...........after loading it will start processing and shrinking............then copying data...........it will restart automatically after progress is done 100%..........be patient.........it takes upto 5-10 mins......
15.If every thing goes fine your computer will start normally.........then go to START> COMPUTER > RIGHT CLICK ON IT > MANAGE
16. New window opens, select disk management from it , given on left hand side....now you can see your C: partition has been reduced in size according to your size specified...........and unallocated space have been created along by C: partion.
17. Finally right click on unallocated space and select NEW SIMPLE VOLUME......a dialog box appers specify size to create a new logical partition...........you may create any number of logical drives till there is free space left...........
18.Now open My Computer ...........you can see your new custom partitions have been created........
19. Done.........enjoy.......
SUPPLEMENTARY:-
1. You can create any image creation tool......to create image of your C: Partiton and save image in yourcustom created partitons.......
2. In future if you want to recover system,,,,,you may use your created image using imaging software forrestoring your C: partiton......may be helpfull instead of running recovery.........
Drawbacks:
Running Recovery form DVD or recovery partiton may delete your custom created partitons...........all datamay be lost.....so regularly backup your data.....
RESOURCES:
http://h30434.www3.hp.com/t5/Other-Notebook-PC-Questions/How-to-repartition-HDD-of-HP-notebook-with-...
FROM EXPERIENCE
ADVICE:
USE IMAGE CREATION SOFT FOR CREATING SYSEM IMAGES AND RESTORE SYSTEM FROMTHEM.........WILL HELP SAVING YOUR CUSTOM PARTITONS...........
WARNING:
ALL INFO IS FROM BEST OF MY KNOWLEDGE,,,,,,,,,,BUT TAKE NO RESPONSIBILTY FOR DATALOSS,,
SYSTEM CRASH,, OR VIOLATION OF WARRANTY...........
After you delete HP_TOOLS partition, BEWARE about one thing: do you have something called HP support assistant in your laptop? if yes, beware when it wants to upgrade HP software, because it will make HP_TOOLS partition reappear without your permission!!
(u may ask for any further any queries,,,,,wll b hppy to help)
Your Support:
ACCEPT IT AS SOLUTION,,,REFER TO OTHER,,, AND CLICK ON KUDOS!!!!!!!!!!!
THANKS,,,,,,,,,(SRY FOR BAD ENGLISH)
,,,,,,,Clicking the White Kudos star on the left is a way to say Thanks!,,,,,,,,
////////Clicking Accept as Solution on a Reply that solves your issue helps others who are searching/////// -
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Hey All,
I am not sure if there is something standard for this or not.
I am calculating the 'Rate' by using 'Value/Amount' and 'Quantity' as follows -
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