How to Make Your Database 200x Faster Without Having to Pay More?
This is a guest repost Barzan Mozafari, an assistant professor at University of Michigan and an advisor to a new startup, snappydata.io, that recently launched an open source OLTP + OLAP Database built on Spark.
Almost everyone these days is complaining about performance in one way or another. It’s not uncommon for database administrators and programmers to constantly find themselves in a situation where their servers are maxed out, or their queries are taking forever. This frustration is way too common for all of us. The solutions are varied. The most typical one is squinting at the query and blaming the programmer for not being smarter with their query. Maybe they could have used the right index or materialized view or just re-write their query in a better way. Other times, you might have to spin up a few more nodes if your company is using a cloud service. In other cases, when your servers are overloaded with too many slow queries, you might set different priorities for different queries so that at least the more urgent one (e.g., CEO queries) finish faster. When the DB does not support priority queues, your admin might even cancel your Continue reading
Worth Reading: Personalized Ransomware
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ICMP Covert Channel for IOS
I wrote a quick-and-dirty covert channel via ICMP for IOS routers.The channel in question isn't super covert. It's all in plaintext and is quite noisy because it only delivers a single byte of message payload per ping. But it gets messages from routers to the listener via pings, and that was the objective. I expect it to be useful when diagnosing IPSec issues behind unknown overload NATs.
It lives here.
Invoke it on a router like this:
It will then send 14 pings (13 for the characters in 'testing 1 2 3' plus an <EOM> terminator) to the target machine.
The listener functions as a packet sniffer, so it requires root access. It prints out a line per incoming message, preceded by the sender's IP address:
Security is Critical for Open Source Projects
It is expensive to have a security team, and not all open source projects can afford it.
Light Blogging Week
This week I’m working on a paper for a PhD seminar, as well as some other things I need to catch up on… I’m just going to be posting worth reading and pointers to some presentations and such in other places. Will return next week with a more normal schedule.
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