Question

How to determine minimum required temporary tablespace for index creation

Asked by: sevior

Hello Experts

I need to recreate index that currently takes space  5,500,000,000 KB on column in  table that has about 125 millon rows.
How do I determine minimum required free space in temporary tablespace to create this index?

Thank you!

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Asked On
2009-10-02 at 06:26:08ID24780077
Topics

Oracle Product Info

,

Oracle 10.x

Participating Experts
2
Points
250
Comments
8

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Answers

 

by: wietmanPosted on 2009-10-02 at 07:24:03ID: 25478185

I would try doing a test in another env or (I know this is asking a lot give the size of your index) try doing an index rebuild.  It is my understanding that a rebuild uses the old index , so I would think TEMP space usage would be minimal.

 

by: seviorPosted on 2009-10-02 at 07:53:30ID: 25478491

wietman, thanks -
default temp tablespace is only 2,213,892 KB - create this index fails. I have altered user to use another tablespace with large amount of free space but that free space will be going down as I create more and more the same kind of indexes. I would like to calculate min amount of space add some more and then ask for it to add to machine. I do not like to go to much overhead and ask for 100 GB. Want to fine some realistic number. And, I was kind of wrong saying "rebuild index" - I should say "create index" - DB was imported w/o indexes, so now I'm running create indexes.

 

by: wietmanPosted on 2009-10-02 at 08:23:48ID: 25478798

Seviro,
IS this number for the size of your index really correct?
5,500,000,000 KB
I read that as 5.5Terabytes.
There is no way you can build that index initially, with only a 2GB temp space.
I guess you already saw that, but that is not even close.
Perhaps you could try benchmarking some smaller indexes with the same number and types of index columns and use those results to extrapolate a rough size based on number of records in the index?
Another option might be to partion your table and then use local indexes on each partition to break it down.  You would still need to do some benchmarking, but the TEMP space required for each partion would be significantly less.

On the other hand, since you are building a new index, their might be some calculation you can use to come up with an approx temp space requirement.
I'll look around some more and see what I can find in a few hours.

 

by: seviorPosted on 2009-10-02 at 08:38:11ID: 25478929

Sorry, it's 5,500,000 KB ~ 5.5 GB.
History of this index (and others) it was initially created on empty or almost empty table. Over years table grew to 125 M rows.

 

by: mrjoltcolaPosted on 2009-10-02 at 09:19:40ID: 25479379

During a CREATE INDEX, Oracle will use the temporary tablespace for storing a complete, sorted list of the keys for the index. So figure how many rows you have in the table, and the rough size of the key colum(s) only, and that is how much space you will need in the TEMP tablespace. The sort will need to store ALL of the keys to complete the sort, then will start building the index in a temporary segment in the index tablespace. Upon completion, the temporary segment in the index tablespace will be converted to an index.

For a really large index, Oracle recommends creating a specific temp tablespace for use during the creation process, assign that tablespace to the user with ALTER USER, create the index, then drop the temp tablespace and ALTER USER back to the standard temp tablespace.

Also you may read Metalink note 102339.1

Hope this helps.

 

by: seviorPosted on 2009-10-02 at 10:22:29ID: 25479935

Thank mrjoltcola and wietman. I have already tried temp table space for the user which runs create index to tablespace with largest availble free space (43 GB). Failed to create index (previously was taking 5.5 GB). I had to request additional space at this piont.

 

by: seviorPosted on 2009-10-02 at 10:26:29ID: 31636362

Please forward any addtional info you think might useful for this case - Regards

 

by: mrjoltcolaPosted on 2009-10-02 at 10:29:18ID: 25479989

It might also be time to partition the table, if the maintenance of the indexes are troublesome. A locally partitioned index can be rebuilt in segments. I would not normally recommend partitioning with only 125million rows, but it could help you, if you have Enterprise Edition.


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