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DB2 temporary BP override


Question posted by: bwmiller16@gmail.com (Guest) on January 23rd, 2008 02:35 PM
Hi All -

The environment: Aix 5.2 with DB2 8 FP 14 all 64bit).

The situation is that another company is hosting our databases and
management has decided to move these databases in-house.

Now, the hosting company has a large (40gb memory) server with very
large bufferpools defined. Our environment has only 8gb memory. The
larger environment really isn't necessary since the DB here isn't all
that large and 40gb is really overkill to the max.

When we copy the database to our local environment and restore we have
no problems. However when we connect locally to the restored DB then
DB2 tries to use the hosting company's databases' bufferpool sizes as
they are currently defined. AIX finally throws-up with page swap
file errors since it just can't handle these huge bufferpools.

It seems like a chicken-egg thing. We'd like to define reasonable
local BP sizes tailored to our environment but can't since we can't
connect; we can't connect because the BP sizes are too large for our
8gb server to handle.

The hosting company refuses to change their BP sizes (which is one
reason we will be bringing these databases in-house).

Anybody have any thoughts?
4 Answers Posted
joachim.c.mueller@googlemail.com's Avatar
joachim.c.mueller@googlemail.com January 23rd, 2008 03:05 PM
Guest - n/a Posts
#2: Re: DB2 temporary BP override

On Jan 23, 3:31*pm, bwmille...@gmail.com wrote:
Quote:
Originally Posted by
Hi All -
>
The environment: Aix 5.2 with DB2 8 FP 14 all 64bit).
>
The situation is that another company is hosting our databases and
management has decided to move these databases in-house.
>
Now, the hosting company has a large (40gb memory) server with very
large bufferpools defined. *Our environment has only 8gb memory. * The
larger environment really isn't necessary since the DB here isn't all
that large and 40gb is really overkill to the max.
>
When we copy the database to our local environment and restore we have
no problems. *However when we connect locally to the restored DB then
DB2 tries to use the hosting company's databases' bufferpool sizes as
they are currently defined. * AIX finally throws-up with page swap
file errors since it just can't handle these huge bufferpools.
>
It seems like a chicken-egg thing. *We'd like to define reasonable
local BP sizes tailored to our environment but can't since we can't
connect; *we can't connect because the BP sizes are too large for our
8gb server to handle.
>
The hosting company refuses to change their BP sizes (which is one
reason we will be bringing these databases in-house).
>
Anybody have any thoughts?


Hi,

perhpas this link can help you to overrides the size of the oversized
bufferpool:

http://www-1.ibm.com/support/docvie...s=utf-8&lang=en

Best regards,
Joachim
bwmiller16@gmail.com's Avatar
bwmiller16@gmail.com January 23rd, 2008 03:15 PM
Guest - n/a Posts
#3: Re: DB2 temporary BP override

On Jan 23, 10:00*am, joachim.c.muel...@googlemail.com wrote:
Quote:
Originally Posted by
On Jan 23, 3:31*pm, bwmille...@gmail.com wrote:
>
>
>
>
>
Quote:
Originally Posted by
Hi All -

>
Quote:
Originally Posted by
The environment: Aix 5.2 with DB2 8 FP 14 all 64bit).

>
Quote:
Originally Posted by
The situation is that another company is hosting our databases and
management has decided to move these databases in-house.

>
Quote:
Originally Posted by
Now, the hosting company has a large (40gb memory) server with very
large bufferpools defined. *Our environment has only 8gb memory. * The
larger environment really isn't necessary since the DB here isn't all
that large and 40gb is really overkill to the max.

>
Quote:
Originally Posted by
When we copy the database to our local environment and restore we have
no problems. *However when we connect locally to the restored DB then
DB2 tries to use the hosting company's databases' bufferpool sizes as
they are currently defined. * AIX finally throws-up with page swap
file errors since it just can't handle these huge bufferpools.

>
Quote:
Originally Posted by
It seems like a chicken-egg thing. *We'd like to define reasonable
local BP sizes tailored to our environment but can't since we can't
connect; *we can't connect because the BP sizes are too large for our
8gb server to handle.

>
Quote:
Originally Posted by
The hosting company refuses to change their BP sizes (which is one
reason we will be bringing these databases in-house).

>
Quote:
Originally Posted by
Anybody have any thoughts?

>
Hi,
>
perhpas this link can help you to overrides the size of the oversized
bufferpool:
>
http://www-1.ibm.com/support/docvie...=SSEPGG&q1=DB2_...
>
Best regards,
Joachim- Hide quoted text -
>
- Show quoted text -


Hi Joachim -

Fabulous! We're going to give this a try and I'll post the results
here...

Thank You very much!

-B
bwmiller16@gmail.com's Avatar
bwmiller16@gmail.com January 24th, 2008 12:15 PM
Guest - n/a Posts
#4: Re: DB2 temporary BP override

On Jan 23, 10:13*am, bwmille...@gmail.com wrote:
Quote:
Originally Posted by
On Jan 23, 10:00*am, joachim.c.muel...@googlemail.com wrote:
>
>
>
>
>
Quote:
Originally Posted by
On Jan 23, 3:31*pm, bwmille...@gmail.com wrote:

>
Quote:
Originally Posted by
Quote:
Originally Posted by
Hi All -

>
Quote:
Originally Posted by
Quote:
Originally Posted by
The environment: Aix 5.2 with DB2 8 FP 14 all 64bit).

>
Quote:
Originally Posted by
Quote:
Originally Posted by
The situation is that another company is hosting our databases and
management has decided to move these databases in-house.

>
Quote:
Originally Posted by
Quote:
Originally Posted by
Now, the hosting company has a large (40gb memory) server with very
large bufferpools defined. *Our environment has only 8gb memory. *The
larger environment really isn't necessary since the DB here isn't all
that large and 40gb is really overkill to the max.

>
Quote:
Originally Posted by
Quote:
Originally Posted by
When we copy the database to our local environment and restore we have
no problems. *However when we connect locally to the restored DB then
DB2 tries to use the hosting company's databases' bufferpool sizes as
they are currently defined. * AIX finally throws-up with page swap
file errors since it just can't handle these huge bufferpools.

>
Quote:
Originally Posted by
Quote:
Originally Posted by
It seems like a chicken-egg thing. *We'd like to define reasonable
local BP sizes tailored to our environment but can't since we can't
connect; *we can't connect because the BP sizes are too large for our
8gb server to handle.

>
Quote:
Originally Posted by
Quote:
Originally Posted by
The hosting company refuses to change their BP sizes (which is one
reason we will be bringing these databases in-house).

>
Quote:
Originally Posted by
Quote:
Originally Posted by
Anybody have any thoughts?

>
Quote:
Originally Posted by
Hi,

>
Quote:
Originally Posted by
perhpas this link can help you to overrides the size of the oversized
bufferpool:

>
>
Quote:
Originally Posted by
Best regards,
Joachim- Hide quoted text -

>
Quote:
Originally Posted by
- Show quoted text -

>
Hi Joachim -
>
Fabulous! *We're going to give this a try and I'll post the results
here...
>
Thank You very much!
>
-B- Hide quoted text -
>
- Show quoted text -


All -

Thanks to Joachim and his reply we were able to do exactly what we
wanted with this DB2 registry variable...it worked great.

-B
Ian's Avatar
Guest - n/a Posts
#5: Re: DB2 temporary BP override

Join Bytes! wrote:
Quote:
Originally Posted by
All -
>
Thanks to Joachim and his reply we were able to do exactly what we
wanted with this DB2 registry variable...it worked great.
>
-B


I know the doc that Joachim mentions it describes this, but make sure
that you alter the bufferpools to have a reasonable size and then unset
DB2_OVERRIDE_BPF. It's not meant to be left on permanently.





 
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