Database & Cloud

Sometimes when I moved or deleted some operating system installation discs, I found I could not release it in the VirtualBox, even I had detached it from all the Virtual Machines. So it was a little w...

Last year, when I was migrating/upgrading a huge Oracle database from 11.1 to 12.1, I encountered one really tough issue and I found the reason after several months. The error messages were like this ...

This was another issue happened several days ago. In our email configuration, there was one central email server to sent email out and all other servers transferred email to this central email server,...

These days got a sendmail issue and fixed it after some research and tests, and I though it could be shared here. The primary email server was 192.168.3.40 and was used as relay server to send email t...

I know the RAID5 is one of the most popular raid types in the enterprise market and I saw it in lots of configurations, so I also selected it for my own small array. One day I read one viewpoint that ...

These days got an issue that some AIX servers could not access one Linux server: ------@------:/home/------/.ssh$ssh 192.168.3.66 Connection closed by 192.168.3.66 (I removed the hostname and username...

Several days ago, I run 'yum update' while failed: error: Couldn't fork %pre(php71u-fpm-7.1.14-1.ius.centos6.x86_64): Cannot allocate memory Error in PREIN scriptlet in rpm package php71u-fpm-7.1.14-1...

Do not know when I began to get this issue: root@debian:~/spksrc/spk/transmission# make arch-armada38x-5.2 ===> Building package for arch armada38x-5.2 make[1]: Entering directory '/root/spksrc/spk...

Some friends wanted me to merge the skipping verification feature to the new Transmission, and I found the original codes here: transmission-2.92_skiphashcheck Based on these codes I made a patch file...

After several days research, I fixed the UPnP issue in my own network environment. Let me introduce my network environment first so you will know why I have to fix this issue. I share the same house w...