Check out meta link note:61997.1 SMON - Temporary Segment Cleanup and Free Space Coalescing. For one explanation.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
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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