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07.18.2006 at 07:01AM PDT, ID: 21923081
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9.4

Index and column ordinal position

Asked by Hilaire in Oracle Database

Tags: , , ,

Hi experts,

I recently added a new column to an existing table using
Alter table star12 add ID_GRP_RISK char(12)

The new field appears in last position when I run a desc on the table.

Now I need to create a new PK / Unique index using both the first column and the newly created one. Should column position be a concern.

I remember from my (old ;-) ) oracle days that column position might affect performances. I don't have the slightest idea if the version I use now (9i) has changed anything reagrding this column ordering.

Would a REORG be sufficient to get decent performances (after changing the unique index / primary key)

NB : dropping/creating the table to change its stucture was not an option.

Any comments welcome (I know I could find this kind of information on the net or simply browsing the KB .. I'm not lazy but my current mission does not leave me much time)

HilaireStart Free Trial
[+][-]07.18.2006 at 07:11AM PDT, ID: 17130380

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About this solution

Zone: Oracle Database
Tags: column, oracle, index, position
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Solution Provided By: angelIII
Participating Experts: 3
Solution Grade: A
 
 
[+][-]07.18.2006 at 07:22AM PDT, ID: 17130492

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[+][-]07.18.2006 at 07:34AM PDT, ID: 17130610

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