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Showing posts from June, 2009

AWS using Ansible? Yes, it's possible!

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  Although, I've used Ansible extensively for a lot of automation and orchestration tasks, using Ansible for AWS was indeed, a new territory for me.  This turned out to be a blessing, since along with using Ansible for AWS tasks, I also learnt how to use WSL (Windows Subsystem for Linux) on a Windows machine. Though WSL's been around for some time, I still hadn't come around to using it since I was mostly using my Macbook pro. Not anymore, though!  Anyway, I have listed below the steps to: Install WSL on Windows 11 23H2 patch Install AWS CLI on Ubuntu 22.04 (Exact version - 22.04.3 LTS) Install Ansible and the amazon.aws collection Use AWS CLI to get the list of  VPCs in the region - us-east-1 (or a region of your choice) Create a python file/script to get the list of VPCs in the region - us-east-1 (or a region of your choice) Create an Ansible playbook to get the list of VPCs in the region - us-east-1 (or a region of your choice.   You may download the comple...
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PCP in Non-RAC Instances - Pitfalls -- Solutions?

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In the last post, I had talked about the pitfalls in configuring PCP in non-RAC instances. I have figured out (is it really the solution? - only time will tell!) workarounds for the 2 pitfalls that I had listed. 1. How would the VNC server failover when using PCP with non-RAC? Ans: The best bet would be to start the vnc server using the virtual hostname instead of the physical hostname (thanks to my colleague Mansoor who suggested it). Once the VNC is started using the virtual hostname, set the display variable to this value and run autoconfig so that the changes are reflected in the concurrent manager and the report server startup scripts. So, when the VIP (and hence, the virtual host) fails over, the VNC would still be running. This solution needs to be tested thoroughly though. Below is the command that I can use: $ vncserver -name <VIRTUAL_HOSTNAME>:<PORT_NUMBER> 2. The web tier 806_ORACLE_HOME tnsnames.ora can be modified to include the FNDFS_<PHYSICAL_HOSTNAME>...
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PCP in non-RAC instances - Pitfalls

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It was a wonderful surprise when I stumbled upon Metalink Note ID: 743716.1 , which details steps for configuring PCP in non-RAC instances. This is very useful while using hardware or software clustering and not Oracle clustering (RAC). We are using Veritas clustering (software clustering) for server failover. We were recently testing server failover and there are two things that I am unable to figure out as of now and which necessitates manual intervention rendering the whole failover mechanism manual: 1. How would the VNC server failover when using PCP with non-RAC? Since, the hostname changes when the failover happens, the display variable would still be pointing to the failed server and not the failover server. The work around to the above problem is obviously to reset the display variable and run autoconfig, which would mean that the failover mechanism is no longer automatic. 2. As soon as the failover happens, we need to make a manual entry in the Web Tier $TNS_ADMIN/tnsnames.ora...
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Check if UTL_FILE and FND_FILE are working fine

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Yesterday, while troubleshooting a vexing ORA-29280 error, I came across 2 useful PL/SQL anonymous blocks that can be used to test FND_FILE and UTL_FILE to find out whether they are indeed working fine. UTL_FILE set serveroutput on DECLARE file_location VARCHAR2(256) := '<first entry on utl_file_dir>'; file_name VARCHAR2(256) := 'utlfile1.lst'; file_text VARCHAR2(256) := 'THIS IS A TEST'; file_id UTL_FILE.file_type; BEGIN file_id := UTL_FILE.fopen(file_Location, file_name, 'W'); UTL_FILE.put_line(file_id, file_text); UTL_FILE.fclose(file_id); EXCEPTION WHEN UTL_FILE.INVALID_PATH THEN dbms_output.put_line('Invalid path ' || SQLERRM); WHEN OTHERS THEN dbms_output.put_line('Others '|| SQLCODE || ' ' || SQLERRM); END; / References: Metalink (MOS) Note ID: 261693.1 FND_FILE set serveroutput on exec FND_FILE.PUT_LINE(FND_FILE.LOG, 'THIS IS A TEST'); HTH....
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Modify retention period of workflow queues

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Yesterday, there was a requirement to increase the retention period of WF_DEFERRED and WF_BPEL_Q so that the developers could troubleshoot issues involving business events. This can be done this way: 1. Check the retention period of existing workqueues. SQL> SELECT owner, name, retention FROM all_queues WHERE name LIKE 'WF%'; OWNER           NAME                                                RETENTION --------------- --------------------------------------------- ------------------------------ APPS                 WF_BPEL_Q                                                0 APPLSYS         WF_INBOUND_QUEUE              ...
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Clone database home (clone.pl) deprecated in Oracle 19c

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Back to blogging, at last. Well, this time it's about clone.pl. Background about clone.pl The easiest way to install a patched and up-to-date Oracle home is to physically copy it from a source server (that is already patched and up-to-date) and use clone.pl on the target server so that the binaries are linked to the target server's OS binaries (like gcc, libstdc++ etc.,), registered with the Oracle Inventory etc. The alternative to clone.pl is to: Install Oracle binaries using GUI or command line Apply the latest patchset (PSU/CPU patches) As you can see now, clone.pl is really useful in order to cut down time to build a database in a new server. More about clone.pl here and here (12c), here (18c). However, in Oracle 19c, Oracle has officially said - " Starting from oracle database 19c ,the clone.pl script is deprecated  and can be removed in a future release. Hence, Oracle recommends that you use the software-only installation option, available in the database installe...
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