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Posted by Greg D. Moore \(Strider\) on 07/19/06 02:03
"shelleybobelly" <shelleybobelly@yahoo.com> wrote in message
news:1153260795.628994.213350@h48g2000cwc.googlegroups.com...
> Right, I agree. If I run it the other way (just update the big lookup
> table from the separate tables where there were changes), it runs much
> quicker, only deleting/adding a thousand or so records a day. The
> owners of this DB are doing things differently, but I guess I'll just
> have to 'educate' them on this one. Then I'll create another job to
> re-index this table about once a week or so to keep it from
> fragmenting.
>
> BTW, this is for a Legal department that has to look up files that can
> be up to 20 years old, but they don't have all the information. That's
> why the 3 million records in a lookup table. It is a subset of a HUGE
> archive table that contains 255 columns, too.
>
To suggestions:
1) move the indexes to an NDF file on a separate set of physical disks.
This may help if you're disk I/O bound at all.
2) May want to consider using full-text indexing for some of this.
> Thanks Erland, keep up your postings.
>
>
> Erland Sommarskog wrote:
> > shelleybobelly (shelleybobelly@yahoo.com) writes:
> > > I have a new job. It needs to drop and re-create (by insert) a table
> > > every night. The table contains approximately 3,000,000 (and growing)
> > > records. The insert is fine, runs in 2 minutes. The problem is that
> > > when I create the indexes on the table, it is taking 15-20 minutes.
> > > There is one clustered index and 11 non-clustered. This is a lookup
> > > table that takes many different paremeters, so it really needs the
> > > indexes for the user interface to run efficiently. However, the
> > > database owners aren't keen on a job taking 20 minutes to run every
> > > night.
> >
> > Without knowing much about the data, it's difficult to tell. But I find
it
> > difficult to believe that data changes that much in a lookup table. Then
> > again, I would not expect a look-up table to have three million rows.
> > Anyway, rather than dropping and recreating, maybe it's more effective
> > to load into staging table, and then update changed rows, insert new
> > ones, and delete old ones.
> >
> >
> > --
> > Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se
> >
> > Books Online for SQL Server 2005 at
> >
http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
> > Books Online for SQL Server 2000 at
> > http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx
>
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