Re: Database Outages - Best Practices
- From: Paul Drake <bdbafh@xxxxxxxxx>
- To: RROGERS@xxxxxxxxxxxxx
- Date: Thu, 17 Feb 2005 14:29:15 -0500
Ron,
This type of partition_view_elimination most certainly does work as
intended, on 8.1.7, 9.2.0, 10.1.0 on win32, lin32.
On standard edition.
Without underscore parameters or events being set.
One must set some initialization parameters and mumble a few magic
words ... put up some check constraints ... but the CBO will prune
partitions on properly constructed queries against a properly
constructed view and its base tables.
Paul
On Thu, 17 Feb 2005 14:21:11 -0500, Ron Rogers <RROGERS@xxxxxxxxxxxxx> wrote:
> When I used V7 we had tables for each year of data and then used a view
> to present the data
> to the user. It was easy to delete a years worth of data, Just change
> the view. Of course it
> did not act like partitioning does when a request for data was made.
> But it did allow for ease
> in maintenance and backups.
> Ron
>
> >>> "Hollis, Les" <Les.Hollis@xxxxxx> 02/17/2005 9:54:24 AM >>>
> That would be great IF the client were to pop the bucks for
> partitioning.
>
> PLUS this is a V7 database I'm talking about here specifically....PLUS
> it is Oracle Financials which you don't want to muck around with table
> definition's, etc...AOL doesn't like it PLUS....PLUS......
>
> You have a pretty good understanding of that part of
> partitioning...but
> AGAIN, it is expensive and not all customers/clients are willing to
> pay
> the price
>
> -----Original Message-----
> From: oracle-l-bounce@xxxxxxxxxxxxx
> [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of david wendelken
> Sent: Thursday, February 17, 2005 8:30 AM
> To: oracle-l@xxxxxxxxxxxxx
> Subject: RE: Database Outages - Best Practices
>
> >> Table reorgs (Typically after huge deletes as in a table purge..)
>
> >> ...So you purge data, drop a table from 27G to 16G , ...
>
> Aren't huge deletes like this forseeable when the system is built?
>
> If so, couldn't the tables be partitioned according to the criteria
> for
> deletion - such as accounting period, etc.?
>
> I know - not always!=20
>
> But where it could be, the downtime wouldn't be needed at all, would
> it?
>
> Just drop the partition and be done with it. Or have I misunderstood
> how partitions work?
>
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