Actually this is true for MS SQL Server: can not handle efficiently more
than 6 joined tables, at least on 6.5 version.
So, m.b. vendor's product was supposed to run not only on Oracle, but other
databases as well.
Igor Neyman, OCP DBA
ineyman_at_perceptron.com
- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
Sent: Wednesday, March 13, 2002 9:58 AM
> oh yes, one more, I got this from a vendor, as an explanation of why
> they didn't do a lookup table but instead added columns to the row for
> EVERY possible value in the lookup table:
>
> Oracle doesn't handle joins with more than 4 tables very well
>
>
>
> --- Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk> wrote:
> >
> > My next to favourite legends.
> >
> > Small tables don't need to be indexed
> >
> > Small tables are anything 4 blocks or less
> >
> > Oracle copies the entire row into the rollback
> > segment when updating a single column.
> >
> > Oracle copies the entire block into the rollback
> > segment when updating a row.
> >
> > Oracle can only use 5 indexes in a query
> > (though I haven't heard that one much recently)
> >
> > Setting tablespace default pctincrease to 1 reduces
> > fragmentation problems.
> > (but that's going out of fashion too)
> >
> > But I guess you, Jeremiah and Rachel have
> > already got those covered.
> >
> >
> >
> > Jonathan Lewis
> > http://www.jlcomp.demon.co.uk
> >
> > Next Seminar - UK, April 3rd - 5th
> > http://www.jlcomp.demon.co.uk/seminar.html
> >
> > Host to The Co-Operative Oracle Users' FAQ
> > http://www.jlcomp.demon.co.uk/faq/ind_faq.html
> >
> > Author of:
> > Practical Oracle 8i: Building Efficient Databases
> >
> >
> > -----Original Message-----
> > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > Date: 12 March 2002 22:54
> >
> >
> > |Everyone, some great ideas....
> > |
> > |RF
> > |
> > |Robert G. Freeman - Oracle8i OCP
> > |Oracle DBA Technical Lead
> > |CSX Midtier Database Administration
> >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Jonathan Lewis
> > INET: jonathan_at_jlcomp.demon.co.uk
> >
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Igor Neyman
INET: ineyman_at_perceptron.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
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Received on Wed Mar 13 2002 - 11:18:36 CST
