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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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Oracle 12c Container views - CDB_ Views

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Today, I did get an opportunity to research on Containers and pluggable databases - the "single instance, multiple databases" concept that's one of the new features of Oracle 12c. I was really curious to know where the container view data comes from, in other words, where does the data for the CDB_ views come from? Well, this is what I found: It is actually coming from a function: SQL> select name,user,cdb from v$database; NAME USER CDB --------- ------------------------------ --- MY12CDB SYS YES 1 row selected. SQL> select dbms_metadata.get_ddl ('VIEW','CDB_OBJECTS') from dual; DBMS_METADATA.GET_DDL('VIEW','CDB_OBJECTS') -------------------------------------------------------------------------------- CREATE OR REPLACE FORCE NONEDITIONABLE VIEW "SYS"."CDB_OB JECTS" CONTAINER_DATA ("OWNER", "OBJECT_NAME", "SUBO...
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Is my server physical or virtual?

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Am I real or virtual? That is the question! That's the realm of philosophy and adhyatma . When and if I put this question to my server, it becomes technical and here's the answer. On Linux # dmidecode | more or dmidecode -s system-manufacturer Sample Output # dmidecode | more # dmidecode 2.9 SMBIOS 2.4 present. 364 structures occupying 17030 bytes. Table at 0x000E0010. Handle 0x0000, DMI type 0, 24 bytes BIOS Information         Vendor: Phoenix Technologies LTD         Version: 6.00         Release Date: 04/14/2014         Address: 0xEA050         Runtime Size: 90032 bytes         ROM Size: 64 kB         Characteristics:                 ISA is supported                 PCI is supported               ...
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Set Hugepages for Oracle 11gR2 database

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1. Execute the shell script provided in Note ID: 401749.1 to find out the ideal setting for the parameter vm.nr_hugepages, set it in /etc/sysctl.conf and reboot VM/Server. Script from Note 401749.1 -bash-3.2$ cat huge_pages_calc.sh #!/bin/bash # # hugepages_settings.sh # # Linux bash script to compute values for the # recommended HugePages/HugeTLB configuration # # Note: This script does calculation for all shared memory # segments available when the script is run, no matter it # is an Oracle RDBMS shared memory segment or not. # # This script is provided by Doc ID 401749.1 from My Oracle Support # http://support.oracle.com # Welcome text echo " This script is provided by Doc ID 401749.1 from My Oracle Support (http://support.oracle.com) where it is intended to compute values for the recommended HugePages/HugeTLB configuration for the current shared memory segments. Before proceeding with the execution please note following:  * F...
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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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