Several days ago I installed a Ubuntu 18.10 on a machine already installed a Windows 10. At the begi...
Dual boot with UEFI boot mode and grub2
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The difference between ‘&&’ and ‘-a’
These days I am reading the book 'Advanced Bash-Scripting Guide' and I got confused about '&&...
‘lsnrctl status’ could not display the status of running listener correctly
My friend got this issue and wanted to know the reason, so I built a test VM to verify it. The dbss ...
ORA-12547 and sysctl -p
This night I installed an Oracle 12c database on SLES12SP3 to test the dbss script on SLES system an...
Systemd service was terminated abnormally during reboot
To start/stop all the instances on a server, I created a script named dbss (database start/stop) and...
du: option requires an argument — ‘X’
Several days ago I encountered this little issue and I found it was very interesting. :) I got a cap...
How to create udev rules of storage devices for ASM usage
When I install the Grid Infrastructure(GI), usually I need to configure the udev rule for the storag...
Some strange behaviours of parted
Last night when I made partitions of one large 3T flash disk, I got some issues with the parted comm...
host map: lookup (domain.com): deferred
This was another issue happened several days ago. In our email configuration, there was one central ...
IP name possibly forged
These days got a sendmail issue and fixed it after some research and tests, and I though it could be...
