How important is Partitioning?

Hello world,
How important is workflow db partitioning? Will i get improvements or headaches ? Is there anyone who can share experience in this matter ?
Regards,
Ricardo

Hello,
I test it on my test DB (Sun os 9/ oracle 9.2.0.4/ 16Go Ram) and found a little bug in the script wfupart.sql (this script works fine for a first installation/creation, if you want to migrate the DB you have to modify some little things in this script)
So, the improvement was really very small..
After a recover of my test DB, and after analysing the code of the workflow. I create some new indexes (normal indexes and FBI indexes) and I'm abble to do better than the partitionning step.
Marco.

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How to use partition by instead of group by?

Hi,
I am having trouble using partition by clause in following case,
column other_number with null values contains 10 records in 'some_table'
5 records with date 11-01-2009, item_code = 1
5 records with date 10-01-2009, item_code = 2
This query returns all 10 records, (which suppose to return 2)
SELECT count (a.anumber) over (partition by TO_char(a.some_date,'MM'), a.item_code) AS i_count, a.item_code,
TO_char(a.some_date,'MM')
     FROM some_table
     WHERE to_char(a.some_date,'yyyy') = 2009
     AND a.other_number IS NULL
Works fine if I wrote like this,
SELECT count (a.anumber) AS i_count, a.item_code,
TO_char(a.some_date,'MM')
     FROM some_table
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     AND a.other_number IS NULL
group by TO_char(a.some_date,'MM'), a.item_code
How to use partition by in this case?

Hi,
Almost all of the aggregate functions (the ones you use in a GROUP BY query) have analytic counterparts.
You seem to have already discovered that whatever values are returned by
an aggregate funcition using "GROUP BY x, y, z" can also be found with
an analytic function using "PARTITION BY x, y. z".
Aggregate queries collapse the result set.
The aggregate COUNT function:
SELECT    deptno
,         COUNT (*)   AS cnt
FROM       scott.emp
GROUP BY deptno
;tells how many of the 14 employees are in each of the 3 departments.
So does the analytic COUNT function:
SELECT    deptno
,         COUNT (*) OVER (PARTITION BY deptno)   AS cnt
FROM       scott.emp
;but the first query produces 3 rows of output, the second query produces 14.
You could get 3 rows of output using the analytic function and SELECT DISTINCT , but it's inefficient.
Which should you use? Like so many other things, the answer depends on what data you have, and what results you want from that data.
If you want collapsed results (one row per group), that's a striong indication that you'll want aggregate, not analytic functions.
If you want one row of output for every row in the table, that's a strong indication that you'll want analytic functions.
If you have a particular question, ask it. Post some sample data and the results you want from that data, as Rob said.
There is another important difference between aggreate and analytic functions: analytic functions can easily be restricted to a window , or subset, of the data set. This is something like a WHERE clause, but a WHERE clause applies to the whole query: a wondowing condition applies only to an individual row.
If you need to compute a SUM of rows with an earlier order_date than this row or an average of the last 5 rows, then you proabably want to use analytic function.

Import a partition?

Hello every one,
I have one partition table say TABLE_A with partitions from jan_2008 to dec_2008.Now i have exported one partition say feb_2008 using the following syntax
exp test/pwd file=part.dmp tables=table_a:feb_2008
now i drop the partition feb_2008 using
SQL>alter table table_a drop partition feb_2008.
Now i want to import that partition from the export dump file.How can i do this?I am getting the following error when i try to imoprt using the following syntax.
imp test/pwd tables=test_range:part3 file=part.dmp ignore=y
. importing TEST's objects into TEST
. . importing partition "TABLE_A":"FEB_2008"
IMP-00058: ORACLE error 14400 encountered
ORA-14400: inserted partition key does not map to any partition
Import terminated successfully with warnings.
Can any one help me by providing the exact syntax for importiong a partition.
Thank you All...

I will give you a clear scenario.
Suppose you are having a Table A with partition from Jan-2008 to Dec-2008.
You want to export the partition of Feb-2008 from Table A and import it to your Test Database.
The syntax for export is as follows..........
exp userid=xyz/<password> file=/tmp/<File_name>.dmp log=/tmp/<File_name>.log buffer=50000000 feedback=10000 tables=A:Feb-2008.
The Dump file will be created in the /tmp directory and you need to import the data into your test database using the following dump file generated in your /tmp directory.
The Syntax for Import is as follows...
imp userid=xyz/<password>@Test file=/tmp/<File_name>.dmp log=/tmp/<File_name_imp>.log buffer=5000000 feedback=10000 commit=y ignore=y fromuser=<Username> touser=<Username> statistics=none
Regards,
Prosenjit.

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How do i partition a hard drive

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How do I partition my MacBook Pro so I can keep Snow Leopard and also install Mountain Lion?

How do I partition my MacBook Pro so I can keep Snow Leopard and also install Mountain Lion?
I want to install the latest OS, but I already know that I will lose a lot of my software unless I can partition the hard drive and have two "bootable" drives.
How do I retain everything I have, partition the drive, then reloa the software I own according to which OS it will work under?

msmedia wrote:
I do not currently own OS X ML.
I am currently running OS X (10.6.8 Snow Leopard) on my MacBook Pro. It has a 2.8GHz Intel Core 2 Duo Processor. I want to upgrade to Mountain Lion, but many of my software titles will not operate with ML and I cannot afford to replace some of them (Adobe Creative Suite, for e.g.)
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I would then purchase and download the Mountain Lion upgrade installer, but not run it. Use Lion Diskmaker to make a bootable USB stick, and perform a clean install of Mountain Lion, replacing the Snow Leopard on your MBP. This way, you make absolutely certain that no third-party drivers or other SL cruft remains to make Mountain Lion unstable. Update to latest ML point release. Fix permissions. Let TimeMachine make a full backup of your ML installation to a different external drive. Then turn of Time Machine.
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Now ideally, you would like to reverse the external clone and put it back into the new SL partition. Then fix permissions. And demonstrate that you can boot into individually stable OS X installations. This would save you alot of work. Resist copying your home directory into ML just yet.
If you cannot successfully achieve the preceding paragraph, you will be faced with a full SL and application reinstall.
The ~/Library contents for SL and ML are sufficiently different that you do not want to mix them. You may want to salvage Safari bookmarks.plist. And, ML created folders in the home directory may have different permissions or ACL settings than in SL. So, my rule of thumb would be to copy folders that you created in SL, and only the contents of matching named OS created folders such as Music, Pictures, Downloads, etc.
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How do I partition my external hard drive without losing data?

How do I partition my external hard drive without losing the data already on it? I've been using it with Time Machine on my old computer, but want to use it as a regular drag-and-drop type back up on my new computer. Is there any way to basically split the hard drive so I can still access the Time Machine backups on my old computer, but also be able to use it with my new mac? Thanks!

If you reformat the drive all data is lost.
The only way to save the data is to copy it somewhere else during the reformat.
Drag & drop will not backup things correctly.
I suggest you set up partition for each Mac and then point Time Machine to each of the partition for each of the Macs.

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HI experts,
What is the use of peartion table
how to create partition ?
how to create index ? how to maintain ?
Thanks in Advance!
Vijay

Read
Partitioned Tables and Indexes
Create Partitioned Tables and Indexes
SQL Server Index and Statistics Maintenance
Many Thanks & Best Regards, Hua Min

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How important is Partitioning?

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