The last spotlight I did was on Tanel Poder, and even though it has just been a few months he's absolutely published some gems which are worth visiting.
Did you know that it is possible for the SGA to be larger than the amount of HugePages in Linux? It is possible and maybe you'll learn something about USE_LARGE_PAGES and SGA_MAX_SIZE too.
Tanel has introduced a new version of his ash_wait_chains script! Looking forward to using this, and to see what's in his next version of the script too.
Want to learn more about Oracle Parallel Execution? Click here for part one and here for part two of some very seriously in-depth articles on the topic!
Ever have to replace a hard drive for Exadata? Tanel breaks down exactly WHY the system believes the drive has failed in a very methodical way that will be easy to replicate the next time we have an issue. I've even picked up a few new tricks here to look at disks in a proactive manner! Also, a great reminder that he has some webinars lined up that I know are worth signing up for.
Here is an interesting post on the difference between "cell flash cache read hits" versus "cell writes to flash cache" metrics.