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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Received on Wed Mar 13 2002 - 08:58:31 CST
