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RE: SMON - Does it cause a degrade?

From: Godlewski, Melissa <Melissa.Godlewski_at_hq.doe.gov>
Date: Fri, 25 Jan 2002 14:27:50 -0800
Message-ID: <F001.003FBD6F.20020125142019@fatcity.com>

Check out meta link note:61997.1  SMON - Temporary Segment Cleanup and Free Space Coalescing.  For one explanation.

-----Original Message-----
From: Rajesh.Rao_at_chase.com [mailto:Rajesh.Rao_at_chase.com] Sent: Friday, January 25, 2002 4:50 PM
To: Multiple recipients of list ORACLE-L Subject: SMON - Does it cause a degrade?

Hey Fellas,

I have an application DBA who insists that the pctincrease at the data tablespace should be set to 0 so that SMON does not coalesce the tablespace. He says coalesce will be performed by using a scheduled batch job written for that purpose. He states that having SMON to perform an coalesce of the tablespace could cause an performance degrade??? I have never heard of such a thing, but then I dont wanna argue with him. He's got wrinkles on his face, and grey hair ;-)

My argument would be, go back to the drawing board, get your tables sized properly, if you anticipate fragmentation. And SMON does not cause a performance degrade? It wakes up every 5 minutes, does hold ST enqueue locks if a tablespace needs coalescing, but it does not cause a performance degrade? Or does it???

Now, can I have a definitive word on this? Any sites, white papers, to refer to that says so, or to the contrary. I need to convince the higher ups.

Raj

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Author:
  INET: Rajesh.Rao_at_chase.com

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