Re: HOW TO MAKE DELETION FAST

2002-01-11 Thread Mike J Kurth


This is one of the reasons for using partitions.
Instead of deleting millions of rows from a large table, you drop the partition
containing the data to be deleted.




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Hi
I want to delete milliuns of row from one table.that table have 2
constraints and some indexes.What to do for fast deletion.When ever I run
deletion it takes time too.
Thanks
-Seema



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RE: HOW TO MAKE DELETION FAST

2002-01-11 Thread Babich , Sergey

Hi, Seema,
I f the issue is still current,  deletions taking too much time may be
caused by not indexed foreign keys. If the child table does not have an
index on a column which references the parent one, to delete even a single
row Oracle performs full table scan which locks the table, too. It is a
serious issue when tables are huge. So I'd check for unindexed foreign keys
first.
Regards,
Sergey Babich

 -Original Message-
Sent:   Thursday, January 10, 2002 6:05 PM
To: Multiple recipients of list ORACLE-L
Subject:HOW TO MAKE DELETION FAST

Hi
I want to delete milliuns of row from one table.that table have 2 
constraints and some indexes.What to do for fast deletion.When ever I run 
deletion it takes time too.
Thanks
-Seema



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RE: HOW TO MAKE DELETION FAST

2002-01-10 Thread Wong, Bing

If TRUNCATE is not possible, then disable the constraints, put database in
no archive log mode and delete.  It should run fast.  Or alter the table to
be nologgin.

After deletion, rebuild the indexes and analyze both tables and indexes.



-Original Message-
Sent: Thursday, January 10, 2002 3:05 PM
To: Multiple recipients of list ORACLE-L


Hi
I want to delete milliuns of row from one table.that table have 2 
constraints and some indexes.What to do for fast deletion.When ever I run 
deletion it takes time too.
Thanks
-Seema



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RE: HOW TO MAKE DELETION FAST

2002-01-10 Thread Suhen Pather


Seema,

Deletions use lots of rollback space and generate lots of redo.
And if there are indexes and constraints its going to prolong the 
transaction.

Depend on the number of records being deleted and availability of space.
It is better to recreate the table without the records that are to be
deleted.  
Then  drop the original table,
rename old table to the new 1,
and recreating the indexes, triggers and constraints that were present b4.

** Just be careful with this approach though cause u need to know what u
really doing.

Regards
Suhen



Hi
I want to delete milliuns of row from one table.that table have 2 
constraints and some indexes.What to do for fast deletion.When ever I run 
deletion it takes time too.
Thanks
-Seema



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RE: HOW TO MAKE DELETION FAST

2001-12-27 Thread Shreepad . Vaidya


Hi,
Disabling of Primary keys and other indexes will make  your deletions
faster .

HTH
shreepad

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RE: HOW TO MAKE DELETION FAST

2001-12-27 Thread Mohan, Ross

indexes, yea, constraints, possibly. 

making sure the disk(s) holding the datafile(s) holding the index extent(s)
were as quiet as possible? Yes

Using parallel execution (in the case the delete has a WHERE clause ) Yes...

Peforming the delete while the database server was relatively quiet? Yes

"Every little bit helps"


hth, 

Ross

-Original Message-
Sent: Thursday, December 27, 2001 5:01 PM
To: Multiple recipients of list ORACLE-L


Would dropping indexes and (if applicable) disabling constraints on the
table, before deleting help ??

Raj
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RE: HOW TO MAKE DELETION FAST

2001-12-27 Thread Jamadagni, Rajendra

Would dropping indexes and (if applicable) disabling constraints on the
table, before deleting help ??

Raj
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RE: HOW TO MAKE DELETION FAST

2001-12-27 Thread Rachel Carmichael

Stephen,

I agree with everything you suggested except #3 -- if he is deleting
that many rows, Oracle will ignore the indexes and will full table scan
the delete anyway. Last I heard (from Oracle University) was that if
Oracle expects more than 5-8% of the table to return from the query, it
will do a full table scan no matter what

Rachel

--- "Karniotis, Stephen" <[EMAIL PROTECTED]> wrote:
> OK.  Everyone is assuming that your deletion of millions of rows may
> be
> expedited by simply truncating the table.  Now, that would be perfect
> if you
> were simply emptying the table.  However, if data is to remain in the
> table,
> then truncate is not the preferred choice.  Here are some options
> along with
> some cautions.
> 
> 1. PL/SQL procedure to perform delete - If you are deleting data
> based on
> values in another table, you could use a DELETE with a correlated
> sub-query
> to delete data.  You could also add a counter to the PL/SQL code to
> delete
> 50,000 rows, commit the deletion and then continue.  Unfortunately,
> if you
> make a mistake with the DELETE, you must recover the table from
> Offline
> archivedlogs.  PL/SQL has never been the preferred choice for working
> with
> LOTS of data.
> 2. CTAS - Create Table as SELECT is another alternative.  If you can
> create
> another table with only the data you want, delete the original table
> and
> simply rename this new table to the old name, you may speed up the
> process.
> Additionally, creating the table as UNRECOVERABLE helps as it reduces
> the
> amount of redo data generated by Oracle.
> 3. Use indexes with the delete process - If your delete process is
> referencing non-indexed columns, you are performing a full table scan
> for
> the DELETE.  Using indexes will help performance significantly
> because the
> amount of data scanned is significantly reduced.
> 4. Traditional DELETE wit subquery - Same as PL/SQL offering except
> you
> cannot control the amount of data deleted between commits.
> 
>   These are four options.  Good luck.
> 
> Thank You
> 
> Stephen P. Karniotis
> Technical Alliance Manager
> Compuware Corporation
> Direct:   (248) 865-4350
> Mobile:   (248) 408-2918
> Email:[EMAIL PROTECTED]
> Web:  www.compuware.com
> 
> 
>  -Original Message-
> Sent: Thursday, December 27, 2001 3:15 PM
> To:   Multiple recipients of list ORACLE-L
> Subject:  RE: HOW TO MAKE DELETION FAST
> 
> TRUNCATE TABLE :-)
> 
> 
> -Original Message-
> Sent: Thursday, December 27, 2001 3:00 PM
> To: Multiple recipients of list ORACLE-L
> 
> 
> Hi Gurus
> How to make deletetion of millions rows faster?
> Please suggest.
> Thx
> Seema
> 
> 
> 
> _
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RE: HOW TO MAKE DELETION FAST

2001-12-27 Thread Godlewski, Melissa
Title: RE: HOW TO MAKE DELETION FAST





If you have indexes on the table you may want to drop prior to delete and rebuild them after it completes.


Does this table have foreign key constraints?  


Rowid is the fastest data access method.  


Create a interim table of the rowids for the rows you want deleted and delete from table where rowid in interim table rowid column.  

You may want to lock the table if you are worried about row migration.


-Original Message-
Sent: Thursday, December 27, 2001 3:00 PM
To: Multiple recipients of list ORACLE-L



Hi Gurus
How to make deletetion of millions rows faster?
Please suggest.
Thx
Seema




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RE: HOW TO MAKE DELETION FAST

2001-12-27 Thread Karniotis, Stephen

OK.  Everyone is assuming that your deletion of millions of rows may be
expedited by simply truncating the table.  Now, that would be perfect if you
were simply emptying the table.  However, if data is to remain in the table,
then truncate is not the preferred choice.  Here are some options along with
some cautions.

1. PL/SQL procedure to perform delete - If you are deleting data based on
values in another table, you could use a DELETE with a correlated sub-query
to delete data.  You could also add a counter to the PL/SQL code to delete
50,000 rows, commit the deletion and then continue.  Unfortunately, if you
make a mistake with the DELETE, you must recover the table from Offline
archivedlogs.  PL/SQL has never been the preferred choice for working with
LOTS of data.
2. CTAS - Create Table as SELECT is another alternative.  If you can create
another table with only the data you want, delete the original table and
simply rename this new table to the old name, you may speed up the process.
Additionally, creating the table as UNRECOVERABLE helps as it reduces the
amount of redo data generated by Oracle.
3. Use indexes with the delete process - If your delete process is
referencing non-indexed columns, you are performing a full table scan for
the DELETE.  Using indexes will help performance significantly because the
amount of data scanned is significantly reduced.
4. Traditional DELETE wit subquery - Same as PL/SQL offering except you
cannot control the amount of data deleted between commits.

  These are four options.  Good luck.

Thank You

Stephen P. Karniotis
Technical Alliance Manager
Compuware Corporation
Direct: (248) 865-4350
Mobile: (248) 408-2918
Email:  [EMAIL PROTECTED]
Web:www.compuware.com


 -Original Message-
Sent:   Thursday, December 27, 2001 3:15 PM
To: Multiple recipients of list ORACLE-L
Subject:RE: HOW TO MAKE DELETION FAST

TRUNCATE TABLE :-)


-Original Message-
Sent: Thursday, December 27, 2001 3:00 PM
To: Multiple recipients of list ORACLE-L


Hi Gurus
How to make deletetion of millions rows faster?
Please suggest.
Thx
Seema



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RE: HOW TO MAKE DELETION FAST

2001-12-27 Thread Khedr, Waleed

how many rows are left? or what is the percentage of rows will be deleted?

-Original Message-
Sent: Thursday, December 27, 2001 3:00 PM
To: Multiple recipients of list ORACLE-L


Hi Gurus
How to make deletetion of millions rows faster?
Please suggest.
Thx
Seema



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Re: HOW TO MAKE DELETION FAST

2001-12-27 Thread Ron Rogers

Seema,
 You did not say how many rows you wanted to keep. If the number is small then I would 
create a table as select.. nologging. and populate it with the rows you want to keep. 
Then truncate the original table and repopulate it with the rows you saved in the 
secondary table. This way the HWM gets reset and and frees up the space not used 
anymore.
ROR mª¿ªm

>>> [EMAIL PROTECTED] 12/27/01 03:00PM >>>
Hi Gurus
How to make deletetion of millions rows faster?
Please suggest.
Thx
Seema



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RE: HOW TO MAKE DELETION FAST

2001-12-27 Thread lhoska

TRUNCATE TABLE :-)


-Original Message-
Sent: Thursday, December 27, 2001 3:00 PM
To: Multiple recipients of list ORACLE-L


Hi Gurus
How to make deletetion of millions rows faster?
Please suggest.
Thx
Seema



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RE: HOW TO MAKE DELETION FAST

2001-12-27 Thread Sherman, Paul R.

If you do not need to log the deletions, truncate the table, then coalesce
the tablespace in question.

Thank you,

Paul Sherman
DBA
voice -  781-501-4143 (office)
fax-  781-278-8341 (office)
email - [EMAIL PROTECTED]


-Original Message-
Sent: Thursday, December 27, 2001 3:00 PM
To: Multiple recipients of list ORACLE-L


Hi Gurus
How to make deletetion of millions rows faster?
Please suggest.
Thx
Seema



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