Suggestion of partitioning?

I'm working on Oracle 11 g 2 node RAC (OLAP database), Linux 2.

I have a huge table (estimated at about 300G) I need to partition. Always on design as well as the table does not exist.
Data reporting will consider queries for a specific day or a month, but the problem here is the database being global we are questioning from places(different timezones) different users and the data provided should take the time zone for the specific user account. We are looking at about 50 different times.
It will store data for 24 months in this table.

It would be an OLAP database and we are planning to return in real time, so I thought having two separate tables, a table (say TABLE1) to store data for a week (as this will include insertion and update activities of lourdes) and the other table (say TABLE2) that will contain the data for 24 months. At the end of week, can use Exchange partition to merge tables.
I was thinking of paritioning per week, but the problem is due to time zone differences, I have need to query would be not satisfied several partitions even to get a value of 1 day of data and a few queries that require recent data of the week by TABLE1 and I need to interview TABLE2 also.

To give an estimate of the size of the table that it could grow to 300M per day.

Any suggestions on what would be the best strategy of partitoning here?

Prabu M says:
Can you please eleborate a little on this point-

Have you worked on how you can write a query that accepts a zone entry and partitions elimination against a partitioned table on one of the data types timestamp (or even partitioned on a simple date data type).

The table would be to have a date column, so I thought the conversion of time that receipt of the request for the time zone of this specific user and by comparing the time with the date column. This will be ok or am I missing something here?

That sounds about right - you are guaranteeing that you provide predicates that do not cause an implicit conversion in the database. I've seen a few cases where people have run intor wrong with that because they started using zone types without checking for the side effects. (Tony Hasler wrote a note about this sort of thing a while ago: http://tonyhasler.wordpress.com/2010/09/04/tonys-tirade-against-timestamp-with-time-zone/)

As far as your condition will - two tables seems reasonable, and you could create a 'partition (i.e. UNION ALL) view' above them, so that you only contain the data once. The two tables could be indexed differently, as you suggest and partitioned differently - e.g. weekly for the history, daily - or even every hour - for recent data. When you move data from the recent history table table you may even sort the data for the most important queries, something like:

create holding _table as
select * from daily_table
where date_stamp >= ... and date_stamp < ...
order by locale_column;

create indexes on holding table

alter table history_table add partition XXX ...
alter table history_table exchange partition XXX with table holding_table ...

create or replace view ZZZ
as
select ... that makes the old data in the daily table invisible and the new data in the partition table visible

drop old partitions from daily table

By the way, about your comment about different indices for both tables - 11.2 allows you to do this kind of thing (with within the limits that I have not yet reviewed) on one partitioned table. You create all index definitions you want to, but make the 'old' unusable partitions on some indexes and the 'new' unusable partitions by others - the optimizer splits a single query in two plans, one for the old data, another for the new data. (See, for example:)
http://Antognini.ch/2009/11/zero-size-unusable-indexes-and-the-query-optimizer/)

Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
http://www.jlcomp.demon.co.UK

Tags: Database

Similar Questions

Need help and suggestions for partitioned tables

Hello
We have a table and it is partitioned and partitioned with datetime column, IE... partition by range.
I tried to run the query in the form below and it runs 1 HR and did not get the result and I kill the query.
Select min (datetime) max (datetime) < big_table > maxdate, mindate; -2203M data in this table
index also in place on these columns as a composite index (code, datetime, status, po_num)
< big_table > - having columns like code, datetime, status, po_num, creation_date
Here is the plan of the explain command:
Hash value of plan: 228211001
------------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time | Pstart. Pstop |
------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT |                   |     1.     8. 4009K (2) | 04:41:57 |       |       |
|   1. GLOBAL TRI |                   |     1.     8.            |          |       |       |
|   2.   RANGE OF PARTITION ALL THE |                   | 2163M |    16G | 4009K (2) | 04:41:57 |     1. 1048575.
|   3.    FULL RESTRICTED INDEX SCAN FAST | POSTATUSINDEX | 2163M |    16G | 4009K (2) | 04:41:57 |     1. 1048575.
------------------------------------------------------------------------------------------------------------
Please give me any suggestions how to get the query faster.
THX in advance

You need to know which column mainly used in queries?

If most of the request uses ID column, then partition of hash on ID will be beneficial.

MSINWINPC - FBW files and restore, backup Dec 2009 concerns, concerns given PC June 2011

Dear Sir/Madam,

I did a back up of my data in December 2009 and I was wondering what is happening during a restore because I read that FWB is an extension for the backup file that is created. It compresses all the saved data and it incorporates in a single file so that it develops the files when performing a restore.

What happened to my computer from my backup, it's that I had to install the Windows Vista Service Pack 2, which has consistently failed. To cut to the Chase, I contacted HP and everything they suggested the partition of hard drive HP factory reset factory reset, does not work properly and therefore all erased my disk hard but does restore all apps doing so my computer a brick. But since then, I contact Microsoft who kindly helped me with my cmputer and it is now working very well. (Thanks a lot).

In any case, since the restore will be expanded I have 3 fear and would like advice on how I should go about restoring:

1. the data amounts to 35.8 GB is currently on my external hard drive and free space on my drive hard is only 38 GB. If the files are all developed the 35.8 GB of data will take over 38GB?

2. If I wanted to restore only certain files (I have a master's thesis I want to find and restore), copy the data to a file on my C drive before using the backup and Restore Center on my computer to find the file and restore?

3. I'm worried that the old files that are saved can conflict with existing files I have been restoring my computer (like copying and pasting a file with the same name). I have to worry about this at all if I had to restore my backup data?

Thank you

Hi Densebrains

Yes, the files get expanded after a restore of the backup is performed and the free space, you mentioned not be enough to restore the backup. When restoring files is performed on the computer disk files with the same name are replaced and you will get a prompt notifying replace it taking place.

See below the help links-

http://Windows.Microsoft.com/en-us/Windows-Vista/back-up-and-restore-frequently-asked-questions

http://Windows.Microsoft.com/en-us/Windows-Vista/restore-files-from-a-backup

I hope this helps.

Merge not supported on table space

Hi all

I'm working on an existing table that has a unique id. It should be expanded with additional id, which we will call a group id.

Assume there is a table

create table t
(
  object_id number not null,
  f1        varchar2(100) not null,
  f2        varchar2(100) not null,
  f3        varchar2(100) not null,
  f4        mdsys.sdo_geometry,
  group_id  number
);

The object_id is the PK and obviously unique. The group_id must be unique for each distinct f1, f2, f3 combination.

I like the merge statement, also for the updates, because of its flexible syntax. I wanted to do:

merge into t
using ( select distinct 
               f1
       ,       f2
       ,       f3
       ,       rownum group_id
       from    t ) g
on    (        t.f1 = g.f1
        and    t.f2 = g.f2
        and    t.f3 = g.f3 )
when matched then update
        set    t.group_id = g.group_id;

but I get an ORA-29886: feature not supported for the field index. (I'm on Oracle Database 10 g Enterprise Edition Release 10.2.0.4.0)

Of course, it is easy to write a pl/sql loop (and I did), but is there a way to do this in pure sql in a single update statement in an elegant way?

Thank you!

Boneist wrote:
Assuming that object_id is a primary key, then I would do something like:
update t
set    t.group_id = (select t2.dr
from   (select t1.*, dense_rank() over (partition by t1.f1, t1.f2 order by t1.f1, t1.f2) dr
from   t t1) t2
where  t2.object_id = t.object_id)

Works better without the PARTITION BY clause ;)

UPDATE t
SET group_id = (
  SELECT dr
  FROM (
    SELECT object_id,
           dense_rank() over(order by f1, f2, f3) dr
    FROM t
  ) v
  WHERE v.object_id = t.object_id
)
;

Of course, it is easy to write a pl/sql loop (and I did), but is there a way to do this in pure sql in a single update statement in an elegant way?

Boneist suggested (without partition), or somewhere in between with a FORALL statement.

For example:

DECLARE

 gid_tab sys.odcinumberlist;
 oid_tab sys.odcinumberlist;

BEGIN

  select object_id,
         dense_rank() over(order by f1, f2, f3)
  bulk collect into oid_tab, gid_tab
  from t
  ;

  forall i in 1..oid_tab.count
   update t
   set group_id = gid_tab(i)
   where object_id = oid_tab(i)
  ;

END;
/

According to the volume of data to process, you may need to test with a LIMIT of COLLECT clause in BULK as well.

Edited by: odie_63 Feb 4. 2011 15:26

Partitioning or an index organized table. Suggestion required.

Hi gurus,
We decided to perfomance increase in customer table that has more than 100 million records
{code}
customer_id number,
cust_name varchar,
Date of Applied_date,
City varchar (100)
{code}
This is the structure of the customer table.
We decided to composite partition the table based on date (range) applied and customer_id (hash).
I am confused to go with table index (where tables and indexes are stored together) for better performance.
Please suggest what we I'm going? for best performance.
Please answer
Supersen

If the query predicate (WHERE clause) include the Partition key column, Oracle can make the size of Partition - that is to say identify the target Partition. Otherwise, he would have to do a full Table Scan because he doesn't know what Partition the target Row (s) is in.

For example, if you are partitioning by APPLIED_DATE but your request is on the table by CITY, Oracle cannot identify the target Partition and do a Scan of Table full - even if you subpartition by CUSTOMER_ID and integrate CUSTOMER_ID in your query, Oracle cannot identify the Subpartition because it cannot identify the Partition.

Hemant K Collette

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Hi malcolm_henry,

From what you describe, you receive an error message when you run OverDrive and attempt to transfer the music files on your SONY reader, are - this correct?

If so, the issue is probably with OverDrive, and you should contact their support of clarification on what means the error message:
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OS: El Capitan 10.11.6

CPU: i5 2.5 GHz

Storage: 500 GB HARD drive

Memory: 16 GB (Max update for this model indicated by Apple's 8GB but 3rd third party provider what OWC makes a 16 GB customized for this particular model)

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Is there any solution for this?

Yes, a replacement hard drive. They are not terribly expensive and replacement is simple.

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Hello!

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Please after the release of the following OSX Terminal commands.

diskutil list

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rMBP 13 "3 - Way Partition

What's up apple community...

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Do not worry about putting in form other that MacOS, just do the partitions.

Install Mac OS first, then work on the other two operating systems
Bootcamp for Windows - NTFS

When you install Ubuntu - ext4

In addition, you mentioned VMware, but I'm confused how it is used.

You need not partition to run virtual machines VirtualBox/Vmware Fusion (for mac/windows/linux)

The hypervisor (vmware) manages the translation between the hardware and the operating system.

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I lost hours tonight - can someone please help?

Thank you!

------------------------------

Step 1: Partition Erase

To begin, open disk utility while searching for it using Spotlight or find in Applications > utilities.

Then click on the partition that you want to remove in the left panel.

Screenshot by Matt Elliott/CNET

With your selected partition, click the clear button in the upper part of disk utility. This will bring up a window with a clear button. Click Remove , and then click done.

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With your partition erased data, you should always delete the now empty partition in order to reallocate space for the rest of your hard drive.

Screenshot by Matt Elliott/CNET

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Are the partitions involved "OS X Journaled" format?

C.

Rebuild the recovery partition

Hi all

Since my macbook pro in construction since a backup time machine, I have no recovery partition. Not sure if the recovery of time machine is the cause, or that the guy who has this laptop (work) in front of me he erased accidentally.

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Any ideas?

I feel that you are not the first user or 'owner' of the MBP. If this is the case, I suggest the following:

Back up all your data.

Erase the HARD drive and start in the recovery of the Internet (OPTION-COMMAND-R) which will connect you to the Apple servers. Following the directions, you will be able to erase the HARD drive and install the original OSX the MBP came with. The recovery partition must be created. (I guess that the MBP is a 2011 late model or newer).

Install a more recent OSX (as appropriate).

Reinstall your user data.

Ciao.

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If you want to install a system on it follow these steps:

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Michelle

Have a Time Machine backup partition on the same drive as your data is a stupid backup plan. Since the main cause of data loss is disk failure to have the backup on the same disk as the means of data when the wrong road, you lose everything.

At Time Machine backup. You never know what data you will lose.

I suggest that you give up your plan to make the Time Machine backups on the same drive as the data. You need another player for that.

cannot start on Mac after resizing partition bootcamp, disk management.

Hello guys.

I have a 13-inch MacBook Pro (9.2) 2012 with OSX 10.9 running. CORE I5, 4 GB ram and a 500 GB hard drive.

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Disk01
Disk02

Disk03

and I can't do anything without verification or partitioning is available. I have reset NVRAM and I ran FSCK as suggested by some article. and nothing works.

No recovery disk is available.

Is there a possible way to correct the situation without losing any data. ??

Search for this community. Your question has been asked and answered often here. Click on the search link located at the top right of this page.

Suggestion of partitioning?

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