uncleflo
Registered since September 28th, 2017
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AWS Aurora MySQL – HA, DR, and Durability Explained in Simple Terms - Percona Database Performance Blog
Saved by uncleflo on July 11th, 2019.
It’s a few weeks after AWS re:Invent 2018 and my head is still spinning from all of the information released at this year’s conference. This year I was able to enjoy a few sessions focused on Aurora deep dives. In fact, I walked away from the conference realizing that my own understanding of High Availability (HA), Disaster Recovery (DR), and Durability in Aurora had been off for quite a while. Consequently, I decided to put this blog out there, both to collect the ideas in one place for myself, and to share them in general. Unlike some of our previous blogs, I’m not focused on analyzing Aurora performance or examining the architecture behind Aurora. Instead, I want to focus on how HA, DR, and Durability are defined and implemented within the Aurora ecosystem. We’ll get just deep enough into the weeds to be able to examine these capabilities alone.
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php - How to 'insert if not exists' in MySQL? - Stack Overflow
Saved by uncleflo on January 24th, 2014.
I started by googling, and found this article which talks about mutex tables. I have a table with ~14 million records. If I want to add more data in the same format, is there a way to ensure the record I want to insert does not already exist without using a pair of queries (ie, one query to check and one to insert is the result set is empty)? Does a unique constraint on a field guarantee the insert will fail if it's already there? It seems that with merely a constraint, when I issue the insert via php, the script croaks.
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Saved by uncleflo on September 15th, 2013.
Marco Fioretti suggests some ways in Linux to automatically compare the contents of multiple directories in order to find missing, duplicate, or unwanted files. Many of us end up, inevitably, with so many files and folders that it is impossible to keep them under control without some specialized help. Luckily, as I'll show you in a moment, under Linux there are several, very efficient solutions to this problem. Multiple copies of many files, scattered all over the computer, waste space, create confusion, and slow down desktop indexers like DocFetcher. I have already explained how to find and remove the unwanted extra copies here.
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