473,735 Members | 2,090 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Self tuning bufferpool

In 9.1 and 9.5 (Linux 64 bit) when a buffer pool is set to self-
tuning, how are blocks configured in respect to blocked vs non-blocked
when self-tuning is set to on?

(ie) I have one bufferpool that is 16k that the IBMDEFAULTBP is shared
between all tablespaces.
The data tablespace has prefetch automatic set to on.
Sep 26 '08 #1
3 7927
Ian
dunleav1 wrote:
In 9.1 and 9.5 (Linux 64 bit) when a buffer pool is set to self-
tuning, how are blocks configured in respect to blocked vs non-blocked
when self-tuning is set to on?

(ie) I have one bufferpool that is 16k that the IBMDEFAULTBP is shared
between all tablespaces.
The data tablespace has prefetch automatic set to on.
STMM will not tune the size of the block-based area of a bufferpool.

Sep 26 '08 #2
On Sep 26, 3:15*pm, Ian <ianb...@mobile audio.comwrote:
dunleav1 wrote:
In 9.1 and 9.5 (Linux 64 bit) when a buffer pool is set to self-
tuning, how are blocks configured in respect to blocked vs non-blocked
when self-tuning is set to on?
(ie) I have one bufferpool that is 16k that the IBMDEFAULTBP is shared
between all tablespaces.
The data tablespace has prefetch automatic set to on.

STMM will not tune the size of the block-based area of a bufferpool.
I can't seem to set a block based area in a bufferpool that is self
tuning.
I can't set a large initial size for the bufferpool area either. When
I set a size and recycle the database, the
initial size defaults back to 1000 16k when using self tuning.

Isn't it possible to allocate a larger initial bufferpool area, and to
use block-based bufferpools when using self tuning memory?
Sep 29 '08 #3
Ian
dunleav1 wrote:
I can't seem to set a block based area in a bufferpool that is self
tuning.
create bufferpool bp
size 100000 automatic
numblockpages 1000
pagesize 4096
I can't set a large initial size for the bufferpool area either. When
I set a size and recycle the database, the
initial size defaults back to 1000 16k when using self tuning.
alter bufferpool yourbp size 100000 automatic numblockpages 1000
Keep in mind, DB2 may reduce the size of the bufferpool if it doesn't
see demand for it.
Isn't it possible to allocate a larger initial bufferpool area, and to
use block-based bufferpools when using self tuning memory?
Yes. But as I said, the number of block pages is fixed when the
bufferpool is allocated. So, while STMM may grow (and shrink) the
size of the page-based area of the bufferpool, the block-based
area will remain fixed.
Sep 29 '08 #4

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

5
2395
by: Paul | last post by:
Hi, is there any way to know the content of the bufferpool : - space usage not present in snapshot - tables actually cached in and number of pages, same for index ... thx
1
6549
by: Christian Berg | last post by:
Hi, I have got a problem with resizing the bufferpool of a DB2 v.8.2 instance. The DB2 runs on an AIX 5.x platform. Problem is that an "ALTER BUFFERPOOL ..." command is not persistent if the database is stopped with the db2stop and restarted with the db2start command.
5
3467
by: Hemant Shah | last post by:
Folks, I am not sure what I am doing wrong, but We have an transaction that does some serious calculation on small chink of data over and over again. It selects few rows from the table several times and does different calculations. It was taking about 45 seconds to run. I thought that moving the file to its own tablespace and giving it large bufferpool would improve the performance. I experienced exactly opposite, the
20
8124
by: Hemant Shah | last post by:
Folks, I am using DB2 UDB 8.2 on AIX 5.1. How large of a bufferpool can you create? I tried to create a 4GB bufferpool db2 complained that is cannot allocate enogth memory. I have 16GB on this system. # db2 create bufferpool cfgbuffpool immediate size 1048576 pagesize 4096 SQL20189W The buffer pool operation (CREATE/ALTER) will not take effect until
3
6237
by: dotyet | last post by:
Hi Everyone, I am in a very strange situation, and am looking for suggestions to tackle it. I have a 10 gig database on 64-bit windows 2003 running platform. The database has about 5 gigs of bufferpool. It's a DB2 UDB 8.2 FP9a database. I am trying to restore an online backup image of this database on a
3
5134
by: Damir Wilder | last post by:
Hello, can someone tell me what exactly the value "Direct reads" means (i.e. how is it calculated), when analysing the bufferpool snapshot? What I do know is that it shows the number of reads that didn't go through the bufferpool, but I would like to know why. I have a very specific problem with a bufferpool that has one tablespace (SMS) assigned to it with only one table inside it. This table doesn't contain any LOB nor LONG VARCHAR,...
3
5009
by: Mark A | last post by:
<dcruncher4@aim.comwrote in message news:fuevgh02ug6@drn.newsguy.com... I would try these: db2set DB2_USE_ALTERNATE_PAGE_CLEANING=ON (this will override CHNGPGS_THRESH) db2set DB2_SKIPINSERTED=ON (this will reduce lock contention on inserts) db2 update db cfg for test using NUM_IOCLEANERS 8 db2 update db cfg for test using LOGBUFSZ 256 db2 update db cfg for test using DBHEAP 2000 (unless it already at least
0
783
by: dunleav1 | last post by:
In 9.1 and 9.5 (Linux 64 bit) when a buffer pool is set to self- tuning, how are blocks configured in respect to blocked vs non-blocked when self-tuning is set to on? (ie) I have one bufferpool that is 16k that the IBMDEFAULTBP is shared between all tablespaces. The data tablespace has prefetch automatic set to on.
2
3118
by: satish mullapudi | last post by:
Hi All, We are using DB2 v8.2 and are planning to migrate to DB2 v9.5. The settings of our servers are as follows: OS: WIN (4 servers) , AIX(1 server) RAM: 3GB HDD: 40GB Other huge s/ws: WAS 6.1, IHS 6.1, other small 3rd party tools ( these doesn't take much of the RAM.
0
8959
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
8784
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
9462
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
8199
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
6049
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
4821
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
3270
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
2738
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2187
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.