| From: | "Jim C(dot) Nasby" <decibel(at)decibel(dot)org> |
|---|---|
| To: | Y Sidhu <ysidhu(at)gmail(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Simulate database fragmentation |
| Date: | 2007-05-27 16:05:38 |
| Message-ID: | 20070527160538.GO92628@nasby.net |
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| Thread: | |
| Lists: | pgsql-performance |
On Wed, May 23, 2007 at 11:58:06AM -0700, Y Sidhu wrote:
> Is there any easy way to take a database and add/delete records to create
> fragmentation of the records and indexes. I am trying to recreate high
> vacuum times.
Update random rows, then do a vacuum. That will result in free space in
random locations. At that point you'd probably want to update some
ranges of rows, enough so that they get forced to new pages.
A better idea might be to just insert random data.
--
Jim Nasby decibel(at)decibel(dot)org
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
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