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optimising [message #238041] Wed, 16 May 2007 07:50 Go to next message
akkumar81
Messages: 144
Registered: February 2007
Location: india
Senior Member

dear friends,

My oracle version is 91

I have an some doubts in oracle 9i.
Am new guy in oracle please repliy my questions..

1) what is optimising?
2) is possible create sequence start with 0.
3) i want to create index in primary column ,which index is better(unique or non unique) which index unique or non unique is better?
4) what is collection ?

please expecting your replies..


Arun..





Re: optimising [message #238042 is a reply to message #238041] Wed, 16 May 2007 07:56 Go to previous message
Maaher
Messages: 7062
Registered: December 2001
Senior Member
  1. Performance tuning.
  2. Yes.
  3. A primary key is unique by definition. A non unique index doesn't make sense.
  4. Read and learn.


http://www.orafaq.com/forum/fa/448/0/

Closed to save you from flames.

MHE
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