Year ago I installed Weblogic server + Oralce database server for a customer. Few months later my colleagues asked me whether something has changed in the environment or if something happened at the data center, because they started to see Java exceptions for unknown hostname for a web service they were calling and this was happening only from time to time. We’ve checked the firewall rules, DNS and all the stuff, but everything seemed to be working fine. The only solution by that time they came out was to add the hostname to the hosts file of the Weblogic server. (more...)
This is short guide on how to run standalone Oracle APEX Listener 2.0 beta with Oracle 11g XE. I’m using Oracle Enterprise Linux 5.7 for running Oracle APEX Listener and Oracle Database 11g XE with APEX 4.1.1. Although running APEX Listener standalone is not supported I’m using it to run several internal applications for company needs.
When using APEX Listener with Oracle XE, APEX won’t work properly and white screen appears when APEX is open. This is because the APEX images are stored in the XML DB repository, but APEX Listener have to be run with (more...)
Recently I was given three virtual machines running Oracle Enterprise Linux 5 and Oracle 11gR2 RAC on Oracle VM 2.2.1, copied straight from /OVS/running_pool/. I had to get these machines up and running at my lab environment, but I found hard to setup the network. I’ve spent half day in debugging without success, but finally found a workaround, which I’ll explain here.
Just a little technical notes – Oracle VM (xen) has three main setup configurations within /etc/xen/xend-config.sxp:
Bridge Networking – this configuration is configured by default and it’s simplest to configure. Using this type of networking (more...)
These days I’m implementing Oracle Dataguard for two Oracle databases 10.2 as part of disaster recovery project, one of them is around 1.7TB, not yet production. As part of the DG setup backups have to be available for both primary and standby. I preferred to use ASM and was able to negotiate with the storage admin to run storage replication for the FRA disks during the backup. This way I would have the same structure and files, locally at the disaster site immediately after the backup of the primary database is completed.
Unfortunately two weeks passed and by (more...)
Recently I had to clone one schema from Oracle Database 10.2.0.3 on HP-UX to 10.2.0.4 on Linux. The first problem came when I tried to export it and got the following errors:
UDE-00008: operation generated ORACLE error 31623
ORA-31623: a job is not attached to this session via the specified handle
ORA-06512: at "SYS.DBMS_DATAPUMP", line 2315
ORA-06512: at "SYS.DBMS_DATAPUMP", line 3185
ORA-06512: at line 1
These gave me no sign of what could be the problem, but when I tried to export only the metadata I got ORA-00600 which helped me (more...)
If for any reason you have a two databases running on the same server and one of them is Oracle 11g Express Edition then you will get surprised that listener of XE is not started automatically during boot if there is another listener already running. Debugging the startup script I found that this happens because of a bug in the code, which assumes that XE listener is running if it finds the word LISTENER within the processes list.
In file /etc/init.d/oracle-xe, at line 556 the code is failing:
+ status='oracle 2889 1 0 May13 ? 00:00:05 /oracle/ora112se/bin/tnslsnr LISTENER -inherit'
+ (more...)
Last month I created a simple APEX application with enabled mobile support and latest version of jQuery, which integrates with HP Service Manager through web services. The purpose was to give option for company engineers to open and update incidents through mobile in few easy steps.
The first step was to create form and report by using the web service. At this point web service request process is created where authentication and input parameter are described. The problem appears if you try to change any parameter and update the web service process. This is the error:
Error error updating web (more...)
In continue of my previous posts about APEX and Subversion I made a short script using APEXExport utility to automate and backup APEX to Subversion repository.
I’m using Oracle Express Edition 11.2, which by default doesn’t have the APEXExport utility. That’s why you need first to create the directory holding it and then copy the utility there.
Create destination directory holding the utility and copy APEXExport.class there:
mkdir -p $ORACLE_HOME/utilities/oracle/apex
Create backup directory in the SVN project for holding the backup files:
[oracle@dbsrv ~]$ svn mkdir -m "Making a backup dir." http://192.168.8.34/svn/oracle/Corporate_Portal/trunk/Apex/Backup
(more...)
This is something I would like to share for a long time, but for one or another reason I didn’t. The error is nothing special, but then I run into very interesting case.
This happen when I had to shutdown one server for maintenance and then boot it again. Once the OS started I notice that the database didn’t ran automatically. When I try to run it manually I got the following error:
SQL> startup
ORA-01078: failure in processing system parameters
ORA-01565: error in identifying file '+DATA/orcl/spfileorcl.ora'
ORA-17503: ksfdopn:2 Failed to open file +DATA/orcl/spfileorcl.ora
ORA-15077: could not locate (more...)
It was busy month and I’m behind with my blog posts. First of all Happy New Year to all of you and wish you all the best through the new year!
This is a short note for installing Oracle Database with ASM under Oracle Enterprise Linux 6.x, which is not certified YET!
If you are running ASM with ASMLib you may get the following error when try to create ASM disk:
[root@db-app2 ~]# oracleasm createdisk DISK01 /dev/mapper/data01
Writing disk header: done
Instantiating disk: failed
Clearing disk header: done
Writing the header on the disk fails without obvious reason. (more...)
Few days ago I received a call from customer about problem with their EM console and messages about file system full. They run DB 11.2.0.2 on OEL 5.7 and had only binaries installation at that file system and the database itself was using ASM. I quickly logged on to find out the file system was really full and after looking around I figure out that all the free space was eaten by alert and trace diagnostic directories. The trace directory was full of 10MB files and the alertlog file was quick growing with following messages:
WARNING: (more...)
I was doing some installation at customer site when they asked if there anything specific to run GI 11.2 on HP-UX as this was their first interaction with 11g. Of course I replied that there is nothing specific, just to make sure the ownership of the raw disk is correct and had a correct ASM discovery string. They said that this is all done as it’s written in the documentation, but disks could not be discovered. This made me curious and asked them to log me in the system so I could have a look.
The system was running (more...)
It’s less than a day, tomorrow starts the Bulgarian Oracle User Group (BGOUG) conference. I’ve been looking for so long for this conference as I missed OOW this year. The conference will took place at Hisarya (near Plovdiv) for three days where there are session only at Friday and Saturday. We are proud that the conference will host seven Oracle ACE Directors and two Oracle ACEs.
I’m looking forward to meet and have a chat with these great people, of course with a lot of friends and have a nice and relaxing weekend.
This is the link to the conference (more...)
In case you need to run PHP with Oracle support this is how to do it with Oracle Enterprise Linux 5.x. I assume that Apache and PHP are already installed.
First you need to download the source of latest version of oci8 driver, here. Also you need to download and install the latest version of Oracle Instant Client Packages – Basic and SDK, here.
The next step is to install both packages on the system:
rpm -ivh oracle-instantclient11.2-basic-11.2.0.3.0-1.x86_64.rpm
rpm -ivh oracle-instantclient11.2-devel-11.2.0.3.0-1.x86_64.rpm
After installing the (more...)
It’s not necessary to work on a big project to use SVN. Keeping your design into SVN repository is very useful and good practice. By doing so you could easily see what changes you’ve made to the design and in case of accident you could restore any older version and correct the problem.
After you successfully setup Subversion (here) it’s time to start integrating tools with SVN. Integration of Oracle SQL Data Modeler is really easy and it’s done in few simple steps:
1. Integrated Oracle SQL Data Modeler with SVN:
Start Oracle SQL Data Modeler
Go to (more...)
This happened to be when I tryed to apply Bundle Patch 10 of Oracle Database 11.2.0.2 on Windows 2008, but I guess it could happen to any 11.x database version. I decided to apply this patch after I stepped the bug in which the heap memory is exhausted because of an CVU health checks (I described it here).
After running opatch apply I got that the following files are still active:
d:\app\11.2.0\grid\bin\oraclient11.dll
d:\app\11.2.0\grid\bin\orageneric11.dll
d:\app\11.2.0\grid\bin\orapls11.dll
d:\app\11.2.0\grid\bin\oracommon11.dll
d:\app\11.2.0\grid\bin\oci.dll
d:\app\11.2.0\grid\bin\orahasgen11.dll
(more...)
As I mentioned in my previous post I’m using Subversion to keep my SQL design, APEX application and all application serving files. Concurrent Versions System are not something new and they are must for big projects. Although I’m single person, I’m finding SVN very useful for many reasons:
- All my files are kept at one place. At any time I could checkout the whole application and deploy it on different server.
- I have a history (revisions) of my changes. If I know something worked yesterday I could just checkout the file from yesterday and get it working.
- Using APEXExport I’m (more...)
Few years ago when I was Linux system administrator I already knew PHP and I used it to create monitoring scripts for the servers and services that I was responsible for. They were really simple application which I kept open in a browser window and integrated javascript to alert me in case some service goes down. The web design wasn’t my strong side, I guess people are born with it, but for my applications these were enough, although they were not as fancy and beautiful as I wanted to be. Then I start coding ASNI C (as a SA this (more...)
Few days ago Oracle announced the release of Oracle Enterprise Manager Cloud Control 12c. I tried to summarize most of the information in my post so I’ll not discuss any details here, but I’ll go only with few details regarding EM12c installation.
For the purpose I have setup a VMWare virtual machine with 2 CPUs, 4GB RAM and 32 GB HDD, one network interface. Installed Oracle Enterprise Linux 6.1 (64 bit) with following parameters:
- Perform custom disk layout, I dedicated 4GB for swap and the rest for the root (/) file system and formatted it with ext4.
- Perform default (more...)
Yesterday at Open World, Oracle announced the release of Enterprise Manager Cloud Control 12c release 1 (version 12.1.0.1), where c stand for cloud. EM12c is a management solution providing centralised monitoring, administration, and lifecycle management functionality for the complete IT infrastructure.
A lot of organisations deploy private cloud environments to offer great flexibility to business users and meet SLAs and security requirements. The Oracle response to these demands is Oracle Enterprise Manager Cloud Control 12c which offers complete life cycle cloud management – setup, deliver and manage clouds.
Once deployed IT must first setup the cloud infrastructure (more...)
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