The table must be dropped, yes.
Default for table is 1 freelist, 2 for indexes.
This is not scientific ( both because there are no
data to support it in your post and I have no hard
perf data of my own ) but freelists are small and
easily/rapidly maintained. Unless you have some
sort of "niche-y" oddball application that needs
every drop of space in a block, you can safely bump
yourself up to 10 freelists on your hot tables. Maybe
just a 2x or 4x on your less incandescent ones.
But, most important: for my money, LoadRunner does
not always accurately simulate actual loads.
You might be tuning yourself away from a non-existent
problem.
hth
-----Original Message-----
Sent: Friday, June 15, 2001 3:31 PM
To: Multiple recipients of list ORACLE-L
We've been load testing an application that will be allowing customers to
enter their email information through the web. The loadrunner application
was experiencing periodic freezing after which it would go back to normal.
Reviewing the statspack information I saw a high number of buffer busy waits
with the majority of the buffer waits being data block waits. This is not
surprising, since the application is doing heavy inserts into several
tables.
The recommendation from an article I have is to create multiple freelists
for the tables undergoing heavy inserts. I've never done this before and I
have no idea of how many to create. Increase the freelists from 1 to 2?
More? What about freelist groups?
And am I correct that the table must be dropped and recreated to increase
this parameter?
I was hoping to have read Gaja's book before I had to deal with this but
it's still in the mail :).
Thanks in advance.
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