Since SMON will coalesce anyway if needed when a request
for extents is made, what's the point in setting PCTFREE to
a value >0 to force periodic coalesces?
An explanation of what takes place during a request for extents
is in the concepts manual.
Jared
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01/25/02 01:50 PM
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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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