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pct free and pct used ???? [message #235986]

Tue, 08 May 2007 10:52

gaur_poonam
Messages: 20
Registered: April 2007
Location: India

Junior Member

Here is a question taken straight from the Couchman text CD. I cant understand why the correct answer is given. I understand the meanings of pctfree / pctused, but I don't know which one is the least desirable:

"Which of the following choices identifies block space utilization settings that are never appropriate under any circumstances:

A: pctfree 5, pctused 90
B: pctfree 20, pctused 70
C: pctfree 15, pctused 80
D: pctfree 10, pctused 40

The correct answer is C. Why ? (I chose B)

Thanks..........

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Re: pct free and pct used ???? [message #236089 is a reply to message #235986]

Wed, 09 May 2007 00:41

Dipali Vithalani
Messages: 278
Registered: March 2007
Location: India

Senior Member

The correct answer is C, because, the total of PCTFREE and PCTUSED should not be greater than 100.

Regards..

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Re: pct free and pct used ???? [message #236108 is a reply to message #236089]

Wed, 09 May 2007 01:09

Michel Cadot
Messages: 68758
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

80 + 15 = 95 < 100, afaik.

Regards
Michel

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Re: pct free and pct used ???? [message #236117 is a reply to message #235986]

Wed, 09 May 2007 01:27

user82
Messages: 49
Registered: June 2006
Location: Romania

Member

For Michel Cadot.....
and also
A: 90 + 5 = 95 <100
B: 70 + 20 = 90 <100
D: 40 + 10 = 50 <100
.....
isn't it??? Could you explain this in detail...i knew the fact that PCTFREE+PCTUSED < 100 but according to this all the answers are correct...

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Re: pct free and pct used ???? [message #236121 is a reply to message #236117]

Wed, 09 May 2007 01:37

Michel Cadot
Messages: 68758
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

user82,

I did not give an answer to the OP question, I replied to Dipali post.

Regards
Michel

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Re: pct free and pct used ???? [message #236201 is a reply to message #235986]

Wed, 09 May 2007 05:05

hotmercury
Messages: 13
Registered: February 2007
Location: Mumbai

Junior Member

Heres something from the docs..."The smaller the difference between 100 and the sum of PCTFREE and PCTUSED (as in PCTUSED of 75, PCTFREE of 20), the more efficient space usage is, at some performance cost." Now, i cant see y option C would be the most inappropriate under any circumstances...!!!

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Re: pct free and pct used ???? [message #236241 is a reply to message #236201]

Wed, 09 May 2007 07:02

gaur_poonam
Messages: 20
Registered: April 2007
Location: India

Junior Member

hi,
thanks to all.but i guess from,

"The smaller the difference between 100 and the sum of PCTFREE and PCTUSED (as in PCTUSED of 75, PCTFREE of 20), the more efficient space usage is, at some performance cost."

the answer is most appropriate for the efficient space usage.so its totally opposite to whats asked in qustion.

thanks.......

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Re: pct free and pct used ???? [message #236249 is a reply to message #235986]

Wed, 09 May 2007 07:21

hotmercury
Messages: 13
Registered: February 2007
Location: Mumbai

Junior Member

...Michel where r u...!! How abt commenting on this.....

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Re: pct free and pct used ???? [message #236253 is a reply to message #236249]

Wed, 09 May 2007 07:27

Michel Cadot
Messages: 68758
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Nothing to say.
Each value can be useful in some cases.
Each value can be desastreous in other cases.
No answer is true, no answer is wrong.
So nothing to say.
So I shut up.

Regards
Michel

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Re: pct free and pct used ???? [message #236258 is a reply to message #235986]

Wed, 09 May 2007 07:45

hotmercury
Messages: 13
Registered: February 2007
Location: Mumbai

Junior Member

Hmmm....how about someone telling me the advantage of keeping the PCTUSED set to a low value..(eg: 40)... Wdnt setting a high value be a better option as the inserts are done more frequently...(ie; less than the PCTUSED..)

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