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....
LifeThinkPad 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...
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...
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...
Configure iSCSI target on latest NexentaStor Community Edition
Last night I installed the latest NexentaStor Community Edition (5.2.1) and tried to create an iSCSI target then added it to some ESXi nodes to build my home lab environment.At the beginning I tho...
ORA-27102 out of memory on a system with huge memory
Today one customer said the data sync of Oracle Dataguard had issue and our guys checked the alert log then sent below errors to me:
ORA-01034: ORACLE not available
ORA-27102: out of memory
Linux-x...
The difference between IP address and Hostname when creating SSH User Equivalency
I provided a 12c RAC step-by-step installation guide to client and he got issue during the deployment. Be specific, he failed the SSH User Equivalency:
$ ssh -o FallBackToRsh=no -o PasswordAuthentica...
Maybe a dangerous configuration of ASM diskgroup with Normal Redundancy
These days my friend Zhiguo discussed with me about the vote disk issue of Normal Redundancy ASM disk group and I found maybe I made a big mistake.Nowadays more and more customers install two SSD ...
Change MBR to GPT/UEFI boot without re-installation
I got big trouble when I tried to deploy the Exadata test environment on my laptop and I found one possible solution maybe was to enable the UEFI boot mode.When I installed Win10 on my laptop, it ...
Key points for Oracle RAC patching
Several weeks ago I patched a 12.2 Oracle RAC and got several issues, I realized there were some key points I should follow during the RAC patching and list them here.1. When patching the whole sy...
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