Hopefully that swap is on an SSD, otherwise that query may not ever finish lol
Once you’re deep into swap, things can get so slow that there’s no recovering from it.WHAT FUCKING QUERY ARE YOU RUNNING TO USE UP THAT MUCH MEMORY DAMN
In a database course I took, the teacher told a story about a company that would take three days to insert a single order. Thing was, they were the sort of company that took in one or two orders every year. When it’s your whole revenue on the line, you want to make sure everything is correct. The relations in that database were checked to hell and back, and they didn’t care if it took a week.
Though that would have been in the 90s, so it’d go a lot faster now.
What did they produce? Cruiseships?
No idea, but I imagine it was something big like that, yes. I think it was in northern Wisconsin, so laker ships are a good guess.
We have a company like that here somewhere. When they have one job a year, they have to reduce hours, if they have two, they are doing OK, and if they have three, they have to work overtime like mad. Don’t ask me what they are selling, though. It is big, runs on tracks, and fixes roads.
A very very badly written one no doubt…
Why stop at just one full table scan?
It will crash as soon as it needs to touch the swap due to the relatively insane latency difference.
So use a small area in memory as cache
the infinite memory paradox. quaint. (lol)
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I posted that 10 months ago.
That being said, it seems to still work for me.
wait, didn’t some tech youtubers like LTT try using cloud storage as swap/RAM? afaik they failed because of latency
This guy used ICMP data payload as a hard drive. It kinda worked.
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It’ll never be fast enough. An SSD is orders of magnitude slower than RAM, which is orders of magnitude slower than cache. Internet speed is orders of magnitude slower than the slowest of hard drives, which is still way too slow to be used for anything that needs memory relatively soon.
You really need to index your tables. This has all the hallways of a Cartesian cross product.
Protip: Put swapfile on ramdisk for highest speed
Does the OOM killer actually work for anyone? In every linux system I’ve used, if I run out of memory, the system simply freezes.
Yes, it takes surprisingly long for the OOM killer to take action, but the system unfreezes. Just wait a few minutes and see whether that does the trick.
I dunno why I didn’t realize you can add more swap to a system while running. Nice trick for a dire emergency.
It’s Linux it’s made by people with a brain.
I don’t want to see the EXPLAIN for that query. This person really needs to learn more about sql, I’d wager.
I’d be lying if I said I hadn’t done something similar before.
Wrote my master thesis this way - didn’t have enough ram or knowledge, but plenty of time on the lab machine, so I let it do its thing over night.
Sorry, lab machine ssd.
Poor man’s Optane
