Friday, July 27, 2018

Resuming Database Upgrade Assistant after Error

If your database upgrade by database upgrade assistant is caught by a glitch, a dialogue box may appear with options of “Ignore”, or “Abort”. There could be a situation whereby you can ignore the error and continue with the upgrade process. But, before you could do this, you would need to resolve the problem that encountered, before clicking the Ignore button to continue.

Sunday, July 15, 2018

Installing Oracle 12c R2 Database Software on Linux 6 and Linux 7

In this article I would explain how to install Oracle 12c R2 database software on Linux 6 and Linux 7. If you want to use ASM as storage and/or Oracle Restart feature, you would need to install 12c R2 Grid Infrastructure before proceeding to install RDBMS software. You must be using at least Linux 6.4 for installation on Linux 6.

Friday, July 6, 2018

ORA-16191: Primary log shipping client not logged on standby

Password file difference is one of the biggest causes of log shipping failure from primary database to the standby. Follow this document to resolve ORA-1619. Following is what would appear in the alert log file if log shipping fails because of password file differences between primary site and standby site.

Thursday, July 5, 2018

Fractured block found during backing up datafile

This error means that RMAN found an inconsistent block during the backup of a datafile. It is quite likely that on second attempt to read the block, RMAN is able to find a consistent image of the block, hence no further action would be required. But, if you need to perform a block recovery, this article will be worth reading. Alert log file will show message similar to the following when this error is reported.

Monday, July 2, 2018

ASM Disk not Accessible and not Appearing in V$ASM_DISK

If you are using ASMLib for your ASM storage and it is working perfectly fine; then, after adding a new ASM Disk you suddenly realize that although new disk is being listed by “oracleasm listdisks” command, it is still not appearing in V$ASM_DISK view. As a result, you are not able to add this new disk in your diskgroup because disk is not accessible to ASM instance. One reason of this could be that ASMLib configuration is not as it should be. Reasons could be: OS patching, oracleasm kernel driver update etc.

Saturday, June 30, 2018

Installing Oracle 12c R2 Grid Infrastructure on Linux 6 and Linux 7

You need to install 12c R2 Grid Infrastructure (for a standalone server) software in order to use ASM and/or Oracle Restart feature. In the following I will explain how to install GI for a standalone server on Linux 6 and Linux 7. You must use at least Linux 6.4 for installation on Linux 6. For this installation, I am using Oracle Linux 7

There are only a couple of differences between the installation procedures on Linux 6 and Linux 7 which I will mention along the way.

Sunday, June 10, 2018

Creating Weblogic Domain for Weblogic Server

After the installationof weblogic server, next step is to create a new weblogic domain. If you have installed weblogic server with examples, there will be a domain already configured during the installation and an application deployed. For the creation of other domain(s), you may follow the steps explained in this article.

Sunday, June 3, 2018

Installing Weblogic Server 12.2 on Linux 6 Linux 7 and Windows

If you want to install full Fusion Middleware, this article will help you, otherwise keep reading this article if you wish to install weblogic server only. In this article I will explain how to install Weblogic and Coherence that is used to deploy Java applications. I did this installation on Linux, but same steps can be followed to install the weblogic server on Windows platform.

Saturday, May 26, 2018

Starting and Stopping Weblogic Server

After you have created a weblogic domain for Fusion Middleware, or a weblogic domain for Weblogc Server, next step is to start the weblogic components that include node manager, administration server and managed server.

Starting Node Manager

First we start the node manager. Use following method to start the node manager. For this example, $DOMAIN_HOME is pointing to /home/oracle/config/domains

Wednesday, May 23, 2018

Creating Weblogic Domain for Fusion Middleware

After we have installed the Fusion Middleware and completed its initial configuration, next step is to configure a weblogic domain. A weblogic domain is a logically related group of weblogic resources. Once we create a domain, and Administration Server instance is also gets created that is used to manage this domain. After this, we can add Managed Servers using this Administration Server by logging into the Administration Server using an admin user account through a console. Web Applications are then deployed on to the managed server(s). We can create multiple managed servers to work as a cluster for load balancing and fault tolerance

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