Database & Cloud – Page 3 – Finding the right solutions

Failed to boot after kernel upgrade

Last night we upgraded some servers and one of them could not be accessed using SSH. I checked it on the vCenter and found it entered emergency mode and showed some messages on the screen.The erro...

09/01/2020Linux146 viewsComments

Archivelog backups were not removed per backup policy

Suddenly our support guys found some archivelog backups were not deleted even they were not needed by the backup policy ( recover window of 7 days).At the beginning I thought maybe it was a simila...

30/11/2019Oracle150 viewsComments

Moved site to Aliyun International

HostKVM is a great VPS provider and I got almost perfect service from it!Every time I got any issue, I would ask help from them and got resolved really soon. And for this reason I did not move out...

14/11/2019Life151 viewsComments

segfault and error 4 in libc-2.12.so

These days I helped to troubleshoot a RedHat Cluster issue.When we run command 'service cman start' we would get a 'FAILED' result and from the /var/log/messages I found below similar error messag...

26/10/2019Linux2,225 viewsComments

Multiple version issue of glibc-common package on RHEL systems

These days we are doing some maintenance tasks on hundreds of RHEL servers and we update them using a shell script. We failed to update part of them and after I fixed the failure I would like to share...

19/10/2019Linux503 viewsComments

How to display the obsoleted packages and versions of a RPM?

These days I patched some servers using a standard script and it run successfully on most nodes until last night.It failed on two nodes and the primary issue was about the python34 package.I g...

11/10/2019Linux175 viewsComments

Talking about ‘recovery window of 7 days’

Sometimes we will keep the database backup for one week and set the retention policy to 'recovery window of 7 days'. So we will only keep the database backup for 7 days, right?In fact, it depends....

05/10/2019Oracle233 viewsComments

ThinkPad E485 memory compatibility issue

For a long time I used my old T420s laptop as primary device while it could only support 16G memory. So at the beginning of June, I bought a new laptop ThinkPad E485 which had 8 CPU cores and could su...

22/08/2019121 viewsComments

Xntpd restarted due to no time server selected

Handled a ntp issue these days and I want to share my learning here as I could not find the right and detail explanation until now.The error message was like the title and when I checked the ntp s...

21/08/2019Unix256 viewsComments

PVG concept in AIX LVM

Long time ago, when I studied the Veritas LVM, I knew the PVG term which meant physical volume group and the physical volumes in the same PVG were from the same SAN or same disk. Usually there is a si...

29/07/2019Unix143 viewsComments

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