Does anyone have documentation on the limit for database shared memory
on Red Hat AS 2.1? On AIX, I know it's 2 GB minus the segments
allocated for db2 core functionality (so about 1.7), but I need the
numbers for Linux (I've heard that it's only 1 GB). I would also
really love it if anyone knows where this is officially documented so
I can point some of the teams I'm working with to it.
Thanks,
Ember
14  5126 
IIRC, it should be 3.75G.
"Ember" <da****@hotmail .com> wrote in message
news:7c******** *************** *@posting.googl e.com... Does anyone have documentation on the limit for database shared memory
on Red Hat AS 2.1? On AIX, I know it's 2 GB minus the segments
allocated for db2 core functionality (so about 1.7), but I need the
numbers for Linux (I've heard that it's only 1 GB). I would also
really love it if anyone knows where this is officially documented so
I can point some of the teams I'm working with to it.
Thanks,
Ember
>>>>> "Ember" == Ember <da****@hotmail .com> writes:
Ember> Does anyone have documentation on the limit for database shared
Ember> memory on Red Hat AS 2.1? On AIX, I know it's 2 GB minus the segments
Ember> allocated for db2 core functionality (so about 1.7), but I need the
Ember> numbers for Linux (I've heard that it's only 1 GB). I would also
Ember> really love it if anyone knows where this is officially documented so
Ember> I can point some of the teams I'm working with to it.
Memory limit on Linux depends on your kernel; both its version and how it is
compiled. Default kernel has limit on 1GB (and this means that 1GB is not
included on this limit). Then you can configure a kernel with 4GB limit
(excluding I/O devices etc; thus about 3.7GB). I guess you can also use
extended memory kind features on newer kernels.
--
Arto V. Viitanen av@cs.uta.fi
University of Tampere, Department of Computer Sciences
Tampere, Finland http://www.cs.uta.fi/~av/
DB2 does support 64-bit addressability on Linux.
If you have 32-bit chips, the limit is about 2.2 GB with
SuSE SLES 8 service pack 2 and DB2 v8.1 FixPak 2 or later.
Ember wrote: Does anyone have documentation on the limit for database shared memory
on Red Hat AS 2.1? On AIX, I know it's 2 GB minus the segments
allocated for db2 core functionality (so about 1.7), but I need the
numbers for Linux (I've heard that it's only 1 GB). I would also
really love it if anyone knows where this is officially documented so
I can point some of the teams I'm working with to it.
Thanks,
Ember
So does this mean that I will be able to create 16 GB or 32 GB
bufferpools on a 64-bit linux system? If so it would be great because
we could run our database completely in memory.
John Wheeler
Blair Adamache wrote: DB2 does support 64-bit addressability on Linux.
If you have 32-bit chips, the limit is about 2.2 GB with
SuSE SLES 8 service pack 2 and DB2 v8.1 FixPak 2 or later.
Ember wrote:
Does anyone have documentation on the limit for database shared memory
on Red Hat AS 2.1? On AIX, I know it's 2 GB minus the segments
allocated for db2 core functionality (so about 1.7), but I need the
numbers for Linux (I've heard that it's only 1 GB). I would also
really love it if anyone knows where this is officially documented so
I can point some of the teams I'm working with to it.
Thanks,
Ember
Yes.
John Wheeler wrote: So does this mean that I will be able to create 16 GB or 32 GB
bufferpools on a 64-bit linux system? If so it would be great because
we could run our database completely in memory.
John Wheeler
Blair Adamache wrote:
DB2 does support 64-bit addressability on Linux.
If you have 32-bit chips, the limit is about 2.2 GB with
SuSE SLES 8 service pack 2 and DB2 v8.1 FixPak 2 or later.
Ember wrote:
Does anyone have documentation on the limit for database shared memory
on Red Hat AS 2.1? On AIX, I know it's 2 GB minus the segments
allocated for db2 core functionality (so about 1.7), but I need the
numbers for Linux (I've heard that it's only 1 GB). I would also
really love it if anyone knows where this is officially documented so
I can point some of the teams I'm working with to it.
Thanks,
Ember
Yes, you should be able to define larger bufferpools on 64-bit
linux. See our AMD64 based TPC-H results on Suse (SLES8) OS.
Regards,
--
Haider
"Haider Rizvi" <ha****@nouce.c a.ibm.com> wrote in message
news:7z******** ****@thinkhr.to rolab.ibm.com.. . Yes, you should be able to define larger bufferpools on 64-bit
linux. See our AMD64 based TPC-H results on Suse (SLES8) OS.
Regards,
--
Haider
For the IBM TPC-H benchmarks I believe they used 6 GB memory per physical
node (2 processors per node). DB2 was partitioned so that there were 2
partitions per node, so that is only 3GB per partition.
That's what I read too. What I'd like to know for instance is if
I can install a single machine with two amd opteron processors with 32
GB of memory running db2 8.1 for (suse) 64 bit linux and create a
bufferpool of lets say 24 GB. That's what 64-bit computing is about
addressing lots of memory.
Regards,
John Wheeler
Mark A wrote: "Haider Rizvi" <ha****@nouce.c a.ibm.com> wrote in message
news:7z******** ****@thinkhr.to rolab.ibm.com.. .
Yes, you should be able to define larger bufferpools on 64-bit
linux. See our AMD64 based TPC-H results on Suse (SLES8) OS.
Regards,
--
Haider
For the IBM TPC-H benchmarks I believe they used 6 GB memory per physical
node (2 processors per node). DB2 was partitioned so that there were 2
partitions per node, so that is only 3GB per partition.
"John Wheeler" <j_*******@hotm ail.com> wrote in message
news:40******** *************@d reader4.news.xs 4all.nl... That's what I read too. What I'd like to know for instance is if
I can install a single machine with two amd opteron processors with 32
GB of memory running db2 8.1 for (suse) 64 bit linux and create a
bufferpool of lets say 24 GB. That's what 64-bit computing is about
addressing lots of memory.
Regards,
John Wheeler
At this point, I think it may depend on the Linux kernel as well as DB2. I
believe you need kernel version 2.6 or higher to go beyond 4GB.
With the recent announcement of Intel's 64 bit processor, I think we will
see widespread Linux support for the kind of memory addressing you are
looking for (24GB) by the end of the year.
64 bit computing will also allow for accessing files larger than 2GB. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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