General oracle

Steps to configure Weblogic proxy plugin in IIS6.0

To configure weblogic Proxy plugin in IIS6.0 we need to have mainly two dll’s (iisforward.dll & iisproxy.dll) and iisproxy.ini in the same folder. The mentioned dll’s  (iisforward.dll & iisproxy.dll) are available with the weblogic installation folder.

My environment details

Microsoft windows server 2003(32bit)
Weblogic 10.3.6

In my setup the dll’s was available in the below location for WL 10.3.6  C:OracleMiddlewarewlserver_10.3serverpluginwin32

Copy the iisforward.dll, proxy.dll to C:Inetpubwwwroot and create a file iisproxy.ini with the below simple configuration.

WebLogicHost=<Weblogic host>

More plugins can be added based on your requirements, the plugin list can be found here

Now the sample output from  C:Inetpubwwwroot directory looks like below.


And in IIS6.0 it looks like below.


I’m using Default website in this example.


  1. Start IIS, go to ‘Default Web Site”, right click on it and select ‘properties’,                         go to ‘ISAPI Filters’ tab, click on Add
  2. Default-prop


Enter the name of your choice for the “Filter name” eg: forwarddll

Now click on browse and select “iisforward.dll“,  and click on OK, as shown below.


Go to the Home Directory, select configuration and select add


Select browse, then iisproxy.dll from drop down list and for extension use .wlforward

and make sure “Verify that the file exits” is not checked (See last check box on screen above and screen shot below point 6).

Then click OK.

Next go to Web Service Extension and make sure that “All Unknown ISAPI Extensions” are allowed.


Here completes the configuration.

Now  you can access you weblogic url via, WLS iis proxy.

for example, in original your application is configured on weblogic port 7001

This can be accessed as

How to get Pre-configured developer VMs?

Oracle gives pre configured Virtual machines, which can be configured in there free Oracle virtual box visualization software. Oracle has  packed development tools into Oracle Virtual box VM appliances that we can download, install and experience.  Import the free downloaded files into Oracle virtual Box and get started.

Some of these VMs are designed to support Developer Day workshops, and have specific hands on labs embedded in them, but they’re available to all.) Be sure to install VirtualBox first.

These are the current available VM’s for download

See also: Oracle VM Templates for use with Oracle VM (production use and redistribution are OK)



Oracle is bringing back Java time zone updating tool

java_DEV_120-294670432ed2b4a6Oracle is bringing back Java time zone updating tool and has reversed a decision it made to remove the “tzupdater” tool from public download. The tool is used to update Java’s internal time zone database and allows users to adjust Java installations so they reflect correct timezones from around the world. Oracle had decided to remove the “tzupdater” tool at the start of March as part of the company’s ending of public updates to Oracle JDK 6, only making the software available to customers with Java 6 support contracts.

Time zones are adjusted regularly around the world by local authorities and keeping synchronised can be a near constant task. The tz database, which used to be called the Olson database, acts as a reference for all this information.The tzupdater tool is built using that database, converted it into the format required by Java, and patches Java installations with the updated information. Oracle update Java to the latest time zone data in JDK and JRE releases whenever they release a maintenance or update version, but there are users who need to ensure they always have to most up to date version of the time zone database installed; for them, Java maintenance updates do not happen quickly enough.

In the announcement of the reversal, Oracle’s Henrik Stahl explained that the inability to update JDK 7’s time zone data was “not in line with our policy” and that “The most recent version of the Oracle JDK will always be available royalty free (including any tools required to keep it up to date)”. Oracle is, says Stahl, also looking for ways to reduce the gap between time zone database updates and JDK/JRE updates. The tzupdater tool is available to download as is documentation on its use.

Databases Errors Linux oracle

ORA-00845: MEMORY_TARGET not supported on this system

Getting ORA-00845: MEMORY_TARGET not supported on this system, while trying to start a database.

sql> startup
ORA-00845: MEMORY_TARGET not supported on this system


This is a very common error which you might face while starting up your oracle database. This happens when your system is out of temporary storage. While starting up the database oracle uses /dev/shm to store temporary files but when it runs out of memory you get this error.

/dev/shm is also know as tmpfs i.e. temporary file system which keeps all the file system in virtual memory to speed up several processes.


Increase the size of /dev/shm

To check the size of /dev/shm
root@localhost# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 10G 4.4G 2.9G 61% /
tmpfs 504M 76K 504M 1% /dev/shm
/dev/sda1 194M 25M 160M 14% /boot

To increase the size
root@localhost# mount -o remount,size=3G /dev/shm
Verify the size
root@localhost# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 7.6G 4.4G 2.9G 61% /
tmpfs 3G 1007M 2.1G 33% /dev/shm
/dev/sda1 194M 25M 160M 14% /boot

To make permanent changes to your file system update your fstab
root@localhost# vi /etc/fstab
tmpfs /dev/shm tmpfs defaults,size=3G 0 0


Update the new fstab file
root@localhost# mount -a

Databases Errors oracle

ORA-01034: ORACLE Not Available

What to do when we get  errors  like ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist.


The ORA-01034 is  simple error, it means that your database is down!  Oracle oerr utility notes this about the ORA-01034 error:

ORA-01034: ORACLE not available


 Oracle was not started up. Possible causes include the following:

  • The SGA requires more space than was allocated for it.
  • The operating-system variable pointing to the instance is improperly defined.


Refer to accompanying messages for possible causes and correct the problem mentioned in the other messages. If Oracle has been initialized, then on some operating systems, verify that Oracle was linked correctly. See the platform specific Oracle documentation.

You may find that you are experiencing ORA-01034 when attempting to upgrade your Oracle database.ORA-01034 is thrown during the attempt to upgrade because there is an invalid entry in one of the following files:

  1. /etc/oratab
  2. /var/opt/oracle/oratab

The ORA-01034 is a result of a discrepancy between ORACLE_HOME andORACLE_SID

To resolve ORA-01034, be sure that the ORACLE_HOME and ORACLE_SIDproperly match within the files /etc/oratab or /var/opt/oracle/oratab .