Thursday May 28, 2009

Postgres 8.4 Testing with new JDBC Drivers

At PGCon 2009, Jesper Pedersen talked to me about the new Binary Transfer patch which was submitted to the JDBC Driver for Postgres 8.4. I thought it will be nice to compare how the JDBC 8.4 driver compared to older 8.3 JDBC Driver. Hence I took it for a drive

The 8.4 JDBC Driver with BinaryTransfer patch seems to get to a better peak faster but since to taper off at high clients. I don't know if this benchmark was the right benchmark for it. Need more benchmarks which uses JDBC to see the performance difference with this feature.

Wednesday May 27, 2009

Postgres on OpenSolaris using 2x Quad Cores: Use FX Scheduler

During my PGCon 2009 presentation there was a question on the saw tooth nature of the workload results on the high end side of benchmark runs. To which Matthew Wilcox (from Intel) commented it could be scheduler related. I did not give it much thought at that time till today when I was trying to do some iGen runs for the JDBC Binary Transfer patch (more on that in another blog post) and also Simon's read only scalability runs . Then I realized that I was not following one of my one tuning advice for running Postgres on OpenSolaris. The advice is to  use FX Class of scheduler instead of the default TS Class on OpenSolaris . More details on various scheduler classes can be found on

Now how many times I have forgotten to do that with Postgres on OpenSolaris I have no idea. But yes it is highly recommended specially on multi-core systems to use FX scheduler class for Postgres on OpenSolaris. How much gain are we talking about? The following graph will give an indication using the default TS scheduler class Vs the FX Scheduler class using the iGen benchmark.

The gain is about 14% by just switching over to FX Class. How did I get Postgres server instance to use FX class? I cheated and put all processes of the user (with userid 236177)  in FX class using the following command line.

# priocntl -s -c FX -i uid 236177

One thing to figure out is how to make sure Postgres uses FX scheduler class out of the box on OpenSolaris so I don't keep forgetting about that minute performance tip.

Friday May 22, 2009

PGCon 2009: Performance Comparison of Postgres 8.3 Vs Postgres 8.4

On the first day of PGCon 2009 I presented on my results of my testing with Postgres 8.4beta1 vs the earlier version (8.3.7). The good news is it should not cause any regressions to existing users of 8.3.7 to upgrade and exploit the opportunity to use the new features of Postgres 8.4. 

Comments/Questions welcome.

Monday May 18, 2009

Postgres 8.4 Lock Wait Statistics Tool

While working on my upcoming presentation for PGCon 2009 on Thursday, I found that sometimes it is misleading to just take one snapshot of locks to figure the hot locks in PostgreSQL workload characterization.

So again starting from one of the DTrace scripts I arrived at pglockwait_84.d

NOTE: It only works with operating systems that support DTrace. I have only tested it on OpenSolaris as of now.

It can either be used to track to summarize all PostgreSQL backends (using '\*')  or selected one using process id using 10 second interval. It also prints time so that it can be dumped into a file for post-processing analysis. 

An example output  is show below during dbt-2 runs using PostgreSQL 8.4 beta1.

# ./pglockwait_84.d '\*' 2009 May 19 02:52:14 Lock-Id Mode Wait-Time(ms) Count Dynamic Locks Exclusive 0 5 ProcArrayLock Shared 0 37 Dynamic Locks Shared 1 52 CLogControlLock Exclusive 1 85 BufFreelistLock Exclusive 1 81 CLogControlLock Shared 1 103 ProcArrayLock Exclusive 2 112 BgWriterCommLock Exclusive 10 123 BufMappingLock Exclusive 11 636 XidGenLock Exclusive 17 2 BufMappingLock Shared 34 1566 WALInsertLock Exclusive 49 2305 LockMgrLock Exclusive 65 852 2009 May 19 02:52:24 Lock-Id Mode Wait-Time(ms) Count XidGenLock Shared 0 1 XidGenLock Exclusive 0 12 ProcArrayLock Shared 1 86 BufFreelistLock Exclusive 4 240 BgWriterCommLock Exclusive 5 213 Dynamic Locks Shared 5 157 CLogControlLock Exclusive 6 238 CLogControlLock Shared 6 384 ProcArrayLock Exclusive 57 360 Dynamic Locks Exclusive 158 7 WALInsertLock Exclusive 187 7837 LockMgrLock Exclusive 226 3251 BufMappingLock Exclusive 289 2141 BufMappingLock Shared 895 5513 2009 May 19 02:52:34 Lock-Id Mode Wait-Time(ms) Count XidGenLock Shared 0 0 Dynamic Locks Exclusive 0 6 XidGenLock Exclusive 0 5 ProcArrayLock Shared 1 76 BufFreelistLock Exclusive 3 183 BgWriterCommLock Exclusive 4 118 ProcArrayLock Exclusive 5 229 Dynamic Locks Shared 5 91 CLogControlLock Exclusive 29 198 CLogControlLock Shared 62 272 BufMappingLock Exclusive 141 1685 LockMgrLock Exclusive 206 2175 WALInsertLock Exclusive 221 5540 BufMappingLock Shared 279 4180 2009 May 19 02:52:44 Lock-Id Mode Wait-Time(ms) Count XidGenLock Shared 0 0 Dynamic Locks Exclusive 0 3 XidGenLock Exclusive 0 5 ProcArrayLock Shared 0 67 BgWriterCommLock Exclusive 1 69 BufFreelistLock Exclusive 2 148 CLogControlLock Shared 3 262 CLogControlLock Exclusive 4 199 ProcArrayLock Exclusive 47 277 WALWriteLock Exclusive 64 2 BufMappingLock Exclusive 79 1599 WALInsertLock Exclusive 151 5949 LockMgrLock Exclusive 198 2377 BufMappingLock Shared 223 4345 Dynamic Locks Shared 1568 144 \^C

It throws an output every 10 second and the time spent in acquiring the locks. For the BufMappingLock, LockMgrLock and Dynamic Locks it aggregates all of them together respectively. It's bit high on system resources if you track all Postgres backends but if you already know which one then it can be low on overhead. Hope it is useful to you too as I found it for my purpose.

Friday May 15, 2009

PostgreSQL Transactions Per Second Using Dtrace

 I modified one of Robert's dtrace scripts so that it is  useful for my purpose to measure often asked transactions per second  for random workload running on PostgreSQL.

The script is as follows:

#!/usr/sbin/dtrace -qs
	@startpersec["New"] = count();
	@commitpersec[ "Commit"] = count();
	@abort["Abort"] = count();
        printf("\*\*\*\*\*\*\*\* Transactions Per Second \*\*\*\*\*\*\*\*\*\\n");
	printf("%20s %15s\\n", "Txn Type", "Count");
	printa("%20s %@15d\\n", @startpersec);
	printa("%20s %@15d\\n", @commitpersec);
	printa("%20s %@15d\\n", @abort);

UPDATE: You can also download it pgtps.d

When you execute it you see outputs every second as follows:

# ./tps.d
\*\*\*\*\*\*\*\* Transactions Per Second \*\*\*\*\*\*\*\*\*
            Txn Type           Count
                 New             192
              Commit             192
               Abort               1

\*\*\*\*\*\*\*\* Transactions Per Second \*\*\*\*\*\*\*\*\*
            Txn Type           Count
                 New             175
              Commit             172
               Abort               0

\*\*\*\*\*\*\*\* Transactions Per Second \*\*\*\*\*\*\*\*\*
            Txn Type           Count
                 New             195
              Commit             198
               Abort               0

\*\*\*\*\*\*\*\* Transactions Per Second \*\*\*\*\*\*\*\*\*
            Txn Type           Count
                 New             183
              Commit             178
               Abort               2

How to interpret the output?

  • New mentions how many transactions started per second
  • Commit talks about how many transactions commited per second.
  • Aborts talks about transactions aborted in that second

Useful specially when some one  asks a questions that they are generally reading from a questionaire like how many transactions per second are we doing?

Where is your TPS report?

Tuesday Apr 21, 2009

Try Postgres 8.4 Beta1 using OpenSolaris Appliance for VirtualBox

Postgres 8.4 Beta1 community binaries are now for OpenSolaris 2008.11. The Beta1 binaries for OpenSolaris can be downloaded from binary location. Postgres 8.4 binaries for Solaris 10 are also available.

For people who don't have OpenSolaris installed on their laptop but want to try out the new improved DTrace Probes in Postgres 8.4beta1, you can install the Minimal OpenSolaris Appliance OVF image for VirtualBox 2.2 and install the Postgres 8.4beta1 binaries in the appliance to try it out. You can also use the DTrace probes on your Mac OS X too.

Easiest way to install the binaries on the OpenSolaris Appliance is to first install SUNWwget package from the OpenSolaris repository

pkg install SUNWwget

and then using copy the download mirror url for those binaries using http and download it with wget in the appliance

wget "\\

The community binaries typically should be untarred in /opt.

bzcat postgresql-8.4beta1-opensolaris.i386-32.tar.bz2 |tar -xf -

This will then have the binaries in /opt/postgres/8.4beta1/. If you also untar the 64-bit binaries then the the 64-bit binaries are available from /opt/postgres/8.4beta1/64.

One thing that I have noticed with these binaries that it does not pick up the libraries if installed in /opt by default so depending on the type of bits you may need to set the following

LD_LIBRARY_PATH=/opt/postgres/8.4beta1/lib; export LD_LIBRARY_PATH


LD_LIBRARY_PATH_64=/opt/postgres/8.4beta1/lib/64; export LD_LIBRARY_PATH_64

Beyond that everything should work as you would expect. Well almost... One thing to also note is that the new 8.4 GUC parameter effective_io_concurrency to allow readahead for bitmap scan index scans is disabled on OpenSolaris / Solaris 10.

 If you do find something that doesn't seem to work, please feel free to leave comments.


Wednesday Apr 15, 2009

Lessons with OpenSolaris Appliances

Going through the comments for Minimal OpenSolaris Appliance entry,  I thought I will go over the problems I encountered when I was working on the script and what I think we can do to improve OpenSolaris in those areas.

1. Setting up the disk

This is probably the first thing that most appliance creators will have to do is to format a new media before it is usable by OpenSolaris. Now to make a disk usable by OpenSolaris (on x86/x64 platforms) two things needs to be done, one a primary Solaris partition needs to be created using fdisk and then a regular Solaris VTOC needs to be initialized on the Solaris partition. While the experience is bit easier with the interactive option of the commands, putting it in a script can be challenging.

Fortunately fdisk has -B option. From the man page:

         Default to one Solaris partition  that  uses  the  whole
         disk. On an x86 machine, if the disk is larger than 2 TB
         (terabytes), the default size of the  Solaris  partition
         will be limited to 2 TB.

Hence I could use the following easily in my script:

fdisk -n -B /dev/rdsk/${INSTALLDISK}p0

Unfortunately I saw no such option for fmthard. Infact it made it more difficult since you need to enter the geometry information of the target disk. I took the easy way out by finding the same for the default VirtualBox disk size which is 16GB and using it as follows:

fmthard -d 0:2:00:48195:33447330 /dev/rdsk/${INSTALLDISK}p0

There are some scripting ways to work this around as Vikram Datta commented on my earlier entry:

  SecCnt=`prtvtoc /dev/rdsk/${INSTALLDISK}p0 | awk '/sectors\\/cylinder/ { print $2 }'`
  LastSect=`prtvtoc /dev/rdsk/${INSTALLDISK}p0 | awk '$1 == "2" { print $5 }'` 
  LastSect=`expr $LastSect - $SecCnt` 
  fmthard -d 0:2:00:${SecCnt}:${LastSect} /dev/rdsk/${INSTALLDISK}p0 

But I think it should be as easy as  fdisk.. i.e. doing the following:

fmthard -B /dev/rdsk/${INSTALLDISK}p0

Hence I have filed a new RFE 6829475. I think this RFE is useful not just for my script but in general helps improve usability of the command to a new learner of OpenSolaris.

2. Setting up the ZPool

The next step of creating zpool for the root device was pretty straight forward

zpool create -f rpool ${INSTALLDISK}s0
zfs set compression=on rpool 
zfs create -o mountpoint=legacy rpool/ROOT
zfs create -o mountpoint=$PKG_IMAGE rpool/ROOT/VOSApp
zfs create -V 128M rpool/swap
zfs create -V 16M rpool/dump
zfs create rpool/ROOT/VOSApp/opt
zfs create rpool/ROOT/VOSApp/var
zfs create rpool/export
zpool set bootfs=rpool/ROOT/VOSApp rpool

Here I took liberty of separating out /opt /var into separate dataset so that I can enable zfs snapshots just for "optional" and "variable" data of the applications. This is a point of view of deployment. Your view may be different here.

3. Setting up the packages from OpenSolaris repository

The next step on how to use OpenSolaris repository to install the pacakges. Alex Eremin had great pointers on his blog that I adapted . The initial setup can be easily done by exporting the PKG_IMAGE environment variable to the directory where you are currently mounting the zpool and then using pkg image-create command.

pkg image-create -f -F -a $PKG_IMAGE
pkg refresh

Then  I played with the package list over and over again to get a minimal size with most network adapter drivers to get on the internet and all required pacakges to allow "pkg" command to work. Of course this is the piece that took me quite a bit of trial and error to figure out the right mix of pacakges so OpenSolaris does boot up successfully and allow "pkg" to run successfully.

pkg install SUNWcsd 
pkg install SUNWcs 
pkg install SUNWcar SUNWcakr SUNWkvm SUNWos86r SUNWrmodr \\
 SUNWpsdcr SUNWpsdir SUNWcnetr SUNWesu SUNWkey SUNWnfsckr \\
 SUNWnfsc SUNWgss SUNWgssc SUNWbip SUNWbash SUNWloc SUNWsshcu \\
 SUNWsshd SUNWssh SUNWtoo SUNWzfskr SUNWipf SUNWintgige SUNWipkg \\
 SUNWadmr SUNWadmap SUNWPython SUNWperl584core SUNWgrub SUNWxcu6\\
 SUNWxcu4 SUNWgawk SUNWgtar SUNWgnu-coreutils SUNWscp SUNWfmd \\
 SUNWxge SUNWbge SUNWnge SUNWrge SUNWrtls \\
 SUNWixgb SUNWchxge SUNWzfs-auto-snapshot SUNWsolnm

I did realize one thing.. Loading one package at a time with pkg is awfully slow. By putting all the packages within one line (except for SUNWcsd and SUNWcs) I could cut down the time from hours to minutes. This was my "Eureka" moment when I could install the packages to a bare-metal .. well a bare-virtualbox VDI within 10 minutes.

4. Setting up the SMF Database on the system

cp $PKG_IMAGE/lib/svc/seed/global.db $PKG_IMAGE/etc/svc/repository.db
chmod 0600 $PKG_IMAGE/etc/svc/repository.db
chown root:sys $PKG_IMAGE/etc/svc/repository.db
# setup smf profiles
ln -s ns_files.xml $PKG_IMAGE/var/svc/profile/name_service.xml
ln -s generic_limited_net.xml $PKG_IMAGE/var/svc/profile/generic.xml
ln -s inetd_generic.xml $PKG_IMAGE/var/svc/profile/inetd_services.xml
ln -s platform_none.xml $PKG_IMAGE/var/svc/profile/platform.xml
# Set the environment variables for svccfg.
${SVCCFG} import ${PKG_IMAGE}/var/svc/manifest/milestone/sysconfig.xml 

Again this is one area I think OpenSolaris can improve a bit. It does some amount of research (google, Alex Eremin) before understanding how to set it up properly. (But then I am not a kernel engineer.)

5. Other Miscellaneous but important stuff to get a bootable system

The following are basically hacks in some ways to get to a bootable system. 

# Set TimeZone 
echo $HOSTNAME > $PKG_IMAGE/etc/nodename 
# configure our new /etc/vfstab
printf "rpool/ROOT/VOSApp -\\t/\\t\\tzfs\\t-\\tno\\t-\\n" >> $PKG_IMAGE/etc/vfstab
printf "/dev/zvol/dsk/rpool/swap\\t-\\t-\\t\\tswap\\t-\\tno\\t-\\n" >> $PKG_IMAGE/etc/vfstab
chmod a+r $PKG_IMAGE/etc/vfstab
# turn off root as a role
printf "/\^root::::type=role;\\ns/\^root::::type=role;/root::::/\\nw" |\\
ed -s $PKG_IMAGE/etc/user_attr
# Edit etc/ssh/sshd_config to allow ssh to root account
printf "/\^PermitRootLogin no\\ns/\^PermitRootLogin no/PermitRootLogin yes/\\nw" |\\
ed -s ${PKG_IMAGE}/etc/ssh/sshd_config 
# Generate ssh keys
ssh-keygen -t dsa -f $PKG_IMAGE/etc/ssh/ssh_host_dsa_key -N ''
ssh-keygen -t rsa -f $PKG_IMAGE/etc/ssh/ssh_host_rsa_key -N ''

6. Finally the boot archive and  grub

# configure /dev in the new image
devfsadm -R $PKG_IMAGE
bootadm update-archive -R $PKG_IMAGE
$PKG_IMAGE/boot/solaris/bin/update_grub -R $PKG_IMAGE
# For zfs root, menu.lst has moved to /rpool/boot/grub/menu.lst. # 
# create the new real grub menu
cat <⁞<-EOF > /rpool/boot/grub/menu.lst
default 0
timeout 10
splashimage /boot/grub/splash.xpm.gz
title  Appliance based on OpenSolaris 2008.11 
findroot (pool_rpool,0,a)
bootfs rpool/ROOT/VOSApp
kernel\\$ /platform/i86pc/kernel/\\$ISADIR/unix  -B \\$ZFS-BOOTFS
module\\$ /platform/i86pc/\\$ISADIR/boot_archive
# make the grub menu files readable by everyone.
chmod a+r $PKG_IMAGE/boot/grub/menu.lst
chmod a+r /rpool/boot/grub/menu.lst
# setup /etc/bootsign so that grub can find this zpool
dir -p /rpool/etc>
echo pool_rpool > /rpool/etc/bootsign
zfs set mountpoint=/ rpool/ROOT/VOSApp
zfs set compression=off rpool 

Hope this makes it easier for  someone thinking of making their own appliances based on OpenSolaris.

NOTE: There was fair number of people who did download the images. I did accidently lose the OpenSolaris image once after it was downloaded 75 times.  But you can track the images directly at

Sunday Apr 12, 2009

Openbravo ERP 2.40 Appliance using Postgres 8.3 appliance with OpenSolaris OVF

Few days ago I talked about a Postgres 8.3 Appliance based on OpenSolaris. Today lets look at how to use that appliance image to get an Openbravo ERP 2.40 appliance based on OpenSolaris in VirtualBox.

Download the Postgres 8.3 Appliance OVF image and unzip the two files. Fire up VirtualBox 2.2 and use File->Import Appliance and point it to the .ovf file  from the zip file. Change the networking from NAT to "Bridged Network" and start the VM and soon you get "postgresdb login:" screen.  Use root/opensolaris to login into the system and verify that postgres instance is already running as follows:

# svcs -a |grep postgres
disabled       19:08:00 svc:/application/database/postgresql_83:default_64bit
online         19:08:23 svc:/application/database/postgresql_83:default_32bit

The default options of postgresql.conf are pretty low so bump them up slightly

# vi /var/postgres/8.3/data/postgresql.conf


# svcadm restart svc:/application/database/postgresql_83:default_32bit

 Now import other required dependencies for Openbravo ERP 2.40

# pkg install SUNWj6dev SUNWant SUNWtcat
DOWNLOAD                                    PKGS       FILES     XFER (MB)
SUNWj6dev                                    0/4     25/4756    1.08/84.90

Make sure that your newly installed tomcat setup has a valid server.xml file or copy it from an example file included. 

# cp /var/apache/tomcat/conf/server.xml-example /var/apache/tomcat/conf/server.xml

 Now download Openbravo ERP 2.40 installer as follows:

# pkg install SUNWwget

# wget ""

# chmod a+x OpenbravoERP_2.40-solaris-intel-installer.bin

# ./OpenbravoERP_2.40-solaris-intel-installer.bin

 And use the following options:

  • /opt/OpenbravoERP | /var/OpenbravoERP/AppsOpenbravo/attachments
  • Complete |Standard | /usr/jdk/latest | /usr/bin/ant 
  • /var/apache/tomcat
  • PostgreSQL
  • /usr/postgres/8.3/bin
  • localhost     5432
  • (Enter password for postgres user as "postgres" twice)
  • openbravo    tad     (Enter password for tad user  twice)
  • Context name: openbravo
  • Date format: DD MM YYYY, Date Separator -, Time format 24h, Time Separator :
  • Demo data: Y or N depending on your preferences

After the information the installation GUI takes quite a bit of time to complete specially if you select to load the demo data. (Hope you made changes to PostgreSQL before to tune this loading.)

Once the installation completes  start tomcat as follows

# /usr/apache/tomcat/bin/

Now from any other machine (or host machine) fire a browser and enter the IP address of the VM with port 8080 and uri openbravo and you now have a virtual VM with Openbravo running


The login screen for Openbravo should appear. Use Openbravo as username and openbravo (all lower case) as password to login and set it up for your business.

Thursday Apr 09, 2009

Minimal OpenSolaris Appliance OVF image for VirtualBox 2.2

One of the things that I always miss in OpenSolaris is text install and the primary reason for using this is in VirtualBox where I want to install just enough OpenSolaris to do a particular task with it like Database Server, Drupal, Java Application Server, etc (but more server like tasks). I really don't need GNOME or any other desktop utilities and it is primary a waste of space if I really have to do it for multiple VMs.

I have created a new OVF image which is less than 270MB size and can be used to play with the OpenSolaris kernel in VirtualBox 2.2 and if you like it can install the rest of the OpenSolaris Desktop to get to the default full blown installation of OpenSolaris 2008.11

Download the OpenSolaris App OVF image, unzip it and just use VirtualBox->File->Import Appliance to import the image into a new VirtualBox VM and you are ready to boot into OpenSolaris kernel. The preset login information is user: root with password: opensolaris.

TIP: If you like this minimal install and would like to try out the full fledge Desktop install just execute the following command

# pkg install slim_install

This will take a long time since it installs packages of another 600MB on top of the installation. But it will be pretty much the same set of packages that comes with OpenSolaris 2008.11 CD.  (Actually I expected "# pkg install entire" to do the intended task but unfortunately it just installed "entire" and not its dependencies. Must be a bug somewhere with "entire". )

 If you are interested in your own custom OVF image, here is how I have created the image:

  • For the time being this requires the  OpenSolaris 2008.11 CD image (650+ MB) only to execute my script which is about 5KB.
  • Download Virtualbox and install it
  • Create a New Virtual Box VM with following parameters in the Wizard Screen
    • Call it  My OpenSolaris Appliance
    • Select OS Type "OpenSolaris" 
    • Base Memory  768MB or increase it to 1GB if you can spare your RAM for it
    • Create a New Dynamic Expanding Image with exactly 16.00 GB (Any other size may not work)
  • Once the VM is created, immediately  click the blue Network link and modify it to select a "Bridged Network"  (in the setup make sure it is connected to the active host interface - wired or wireless depending on the host system)
  • Also Click the CD-ROM image and point it to the osol-200811.iso image that you downloaded earlier
  • Boot up the VM and select the first LiveCD option in the Grub Menu options
  • Select through the defaults to get the full Gnome Desktop
  • Open Firefox in the VM and make  sure your VM  has internet access
  • Open a terminal window and execute the following commands in sequence
    • wget ""
    • time pfexec sh -x
    • pfexec halt
  • At this point stop the VM and disconnect the CD image connected to the VM and use VirtualBox->File->Export Appliance Wizard to export the image
It takes about 12 minutes to create an image of about 270MB using the above steps with a decent internet connection and decent desktop.

If you want to own customized Image, take a look at and and create your own versions of it for say Drupal, Ruby, Glassfish, etc.

Wednesday Apr 08, 2009

Postgres 8.3 Appliance for VirtualBox 2.2

With the release of VirtualBox 2.2 today, exporting and importing appliances becomes lot easier. The new features of VirtualBox 2.2 includes import and export of appliances based on OVF or Open Virtualization Format. 

One of  my earlier blog entry talks about creating appliances. Using the same script mentioned in the earlier blog entry,  I now have a OVF Image  which will work with VirtualBox 2.2  "Import Appliance"  and make it easier to try a virtual PostgreSQL 8.3 database appliance running OpenSolaris under the cover.

The PostgreSQL 8.3 Appliance Image is less than 330MB (unlike a full install of OpenSolaris which could take more than 1500MB).  Just unzip the files in a directory and import them through VirtualBox 2.2 using File->Import Appliance Wizard.  Since an appliance (database in this case) is typically accessed through external application servers, you will want to use Bridge Network instead of NAT.  Detailed instructions to make it accessible (both VirtualBox VM as well as PostgreSQL 8.3)  from external clients are published on Postgres 8.3 Appliance page.

Finally  it is lot easier to finally see the following grub menu on your own VirtualBox 2.2:

 Also for PostgreSQL users/developers who are not familiar with OpenSolaris,  this VM  allows you to try the DTrace probes and ZFS snapshots with PostgreSQL 8.3. More information related to it is  coming soon on Postgres 8.3 Appliance page. Also the PostgreSQL DTrace Toolkit 2009.03.29 is available on

Tip: You can also use my PostgreSQL Monitor Demo to connect to it:

As usual if you have questions, I will be happy to answer them.


Jignesh Shah is Principal Software Engineer in Application Integration Engineering, Oracle Corporation. AIE enables integration of ISV products including Oracle with Unified Storage Systems. You can also follow me on my blog


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