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configuration advisor on buffer pool size

hi, we are using db2 udb v8.1 on windows, i try to use the
configuration advisor to get recommendation on the parameter setting,
at first, i give the target memory for DB2 is 80% of the physical
memory, it gives me a recommendation on bufferpool size, so i accept
the change, later on , i found that i gave too much memory to DB2, so
i change the target lower, but the recommendation doesn't change the
buffer pool size accordingly, why is that? thanks
Nov 12 '05
36 4378
one thing i noticed is that i used control center change the
bufferpool size IBMfefaultfb from 437471 to 250000, but the get db cfg
still gives me 437471, so which value DB2 is using? i am confusing
Nov 12 '05 #21
"xixi" <da****@yahoo.c om> wrote in message
news:c0******** *************** **@posting.goog le.com...
one thing i noticed is that i used control center change the
bufferpool size IBMfefaultfb from 437471 to 250000, but the get db cfg
still gives me 437471, so which value DB2 is using? i am confusing


If you want to change the bufferpool size, alter each of the bufferpools. Do
not use the default parameter.
Nov 12 '05 #22
"xixi" <da****@yahoo.c om> wrote in message
news:c0******** *************** **@posting.goog le.com...
one thing i noticed is that i used control center change the
bufferpool size IBMfefaultfb from 437471 to 250000, but the get db cfg
still gives me 437471, so which value DB2 is using? i am confusing


If you want to change the bufferpool size, alter each of the bufferpools. Do
not use the default parameter.
Nov 12 '05 #23
this is what i do, i go to control center, right click buffer pools,
do alter, then change the size. i saw the size changed, but once i db
cfg , i still get the old size value
Nov 12 '05 #24
this is what i do, i go to control center, right click buffer pools,
do alter, then change the size. i saw the size changed, but once i db
cfg , i still get the old size value
Nov 12 '05 #25
xixi,

that's it.

The buffpage is the default if you create a new bufferpool and put a -1 in
the field,
so the bufferpool created will take the buffpage from db cfg.

On the other side, if you create an bufferpool wih a really size, not -1 you
have
a bufferpool with this size.

regards,

Joachim Müller

"xixi" <da****@yahoo.c om> schrieb im Newsbeitrag
news:c0******** *************** ***@posting.goo gle.com...
this is what i do, i go to control center, right click buffer pools,
do alter, then change the size. i saw the size changed, but once i db
cfg , i still get the old size value

Nov 12 '05 #26
xixi,

that's it.

The buffpage is the default if you create a new bufferpool and put a -1 in
the field,
so the bufferpool created will take the buffpage from db cfg.

On the other side, if you create an bufferpool wih a really size, not -1 you
have
a bufferpool with this size.

regards,

Joachim Müller

"xixi" <da****@yahoo.c om> schrieb im Newsbeitrag
news:c0******** *************** ***@posting.goo gle.com...
this is what i do, i go to control center, right click buffer pools,
do alter, then change the size. i saw the size changed, but once i db
cfg , i still get the old size value

Nov 12 '05 #27
no, i am not creating a new bufferpool, i am change the bufferpool
size of ibmdefaultbf. in control center, you can have option to change
the size, and i saw the size changed immediately , but not under
configuraion parameter buffpage. i still don't understand why they
aren't consistent, i have to restart the instance in order to change
buffpage parameter to make the same as i alter the size of
ibmdefaultbf.
Nov 12 '05 #28
no, i am not creating a new bufferpool, i am change the bufferpool
size of ibmdefaultbf. in control center, you can have option to change
the size, and i saw the size changed immediately , but not under
configuraion parameter buffpage. i still don't understand why they
aren't consistent, i have to restart the instance in order to change
buffpage parameter to make the same as i alter the size of
ibmdefaultbf.
Nov 12 '05 #29
xixi,

if you want to change the db cfg buffpage parameter you have to update

db2 update db cfg for <db-name> using buffpage <size in 4k pages>

and then update the ibmdefaultbp in the CC to -1.

I think you have to stop and start the instance or disconnect all.

regards,
Joachim Müller

"xixi" <da****@yahoo.c om> schrieb im Newsbeitrag
news:c0******** *************** ***@posting.goo gle.com...
no, i am not creating a new bufferpool, i am change the bufferpool
size of ibmdefaultbf. in control center, you can have option to change
the size, and i saw the size changed immediately , but not under
configuraion parameter buffpage. i still don't understand why they
aren't consistent, i have to restart the instance in order to change
buffpage parameter to make the same as i alter the size of
ibmdefaultbf.

Nov 12 '05 #30

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