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Today in my proofs class (MATH 290 at BYU) we talked about the concept induction . I like this, because it sounds a lot like recursion. On the Wikipedia article, there’s an excerpt from a book that illustrates the principle with an analogy using a ladder: Mathematical induction proves that we can climb as high as we like on a ladder, by proving that we can climb onto the bottom rung (the basis) and that from each rung we can climb up....
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Log file switch (checkpoint incomplete) wait events and LGWR waiting for checkpoint progress
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tanelpoder.com
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7 years ago
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eng
I was recently involved in troubleshooting an interesting performance issue with some non-intuitive background process & wait event behavior. I reproduced the problem in my own custom-tailored environment (Oracle 18.3 on Linux), here’s the starting point: After starting a transaction-heavy benchmark, soon after the transaction rate drops and the database sessions are mostly waiting for some Configuration wait class events, instead ..
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Log file switch (checkpoint incomplete) wait events and LGWR waiting for checkpoint progress
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tanelpoder.com
-
7 years ago
-
eng
I was recently involved in troubleshooting an interesting performance issue with some non-intuitive background process & wait event behavior. I reproduced the problem in my own custom-tailored environment (Oracle 18.3 on Linux), here’s the starting point: After starting a transaction-heavy benchmark, soon after the transaction rate drops and the database sessions are mostly waiting for some Configuration wait class events, instead ..
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Ultimate Member is one of the many user profile & membership plugins for WordPress. The plugin makes it a breeze for users to sign-up and become members of your website. The plugin allows you to add user profiles to your site and is suitable for creating advanced online communities and membership sites. Lightweight and highly extendible, Ultimate Member will enable you to create almost any type of site where users can join and become member..
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Just a quick note to report that Eve v0.8.1 is out and ready to rock . It brings a number of fixes, some improvements as well as a couple of new features. Check out the changelog for details. Join the newsletter to get an email alert when a new post surfaces on this site. If you want to get in touch, I am @ nicolaiarocci on twitter.
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As a software engineering executive from Colombia, I thought that the best way to honor Hispanic Heritage Month (September 15-October 15) was to help the local Girl Scout Hispanic troops earn one of the new cybersecurity badges. October is Cybersecurity Awareness Month, having the activities nearing October seemed very fitting. Girl Scouts has been focusing on STEM badges for all ages with several new initiatives in the past couple of years..
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Applite - An App Store for Homebrew | App Addict . Cirrus & Bailiff (iCloud debugging tools) . Cork: The Homebrew GUI for macOS . Customizing the Cocoa Text System . Dark Reader . dmgbuild - A command line tool to build .dmg files . GetStream/Winds: macOS rss reader . GitHub - herrbischoff/awesome-macos-command-line . GitHub - koekeishiya/yabai: A tiling window manager for macOS based on binary . GitHub - TermiT/Flycut: Clean and s....
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Now that September is over, it’s time to take a look at my Robinhood account and check on its performance. For those that are new to my blog, I’ve been making these monthly updates since my first full month of buying stocks on Robinhood in June of this year . That means this is the fourth post in the series.
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This Norwegian language blog post summarizes my talk at Oslo Agile Meetup in the beginning of October. Jeg tror ingen egentlig vet hvordan de skal få til bra utviklingsprosjektet. Selv når vi lykkes så er det veldig mye flaks. De fleste av oss tror vi kunne gjort mye bedre. For de fleste av oss holder tilstanden til kodebasen oss tilbake fra det vi synes vi burde ha fått til. Vi har lært en del ting om hva som i teorien skal være løsning:
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My work on adding bulk_update() to Django has been merged and will be released in Django 2.2! Like my filtered aggregates feature it relies heavily on the wonderfully versatile CASE statement to achieve some pretty good speedups for certain use-cases. The development documentation gives a pretty cle...
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My work on adding bulk_update() to Django has been merged and will be released in Django 2.2! Like my filtered aggregates feature it relies heavily on the wonderfully versatile CASE statement to achieve some pretty good speedups for certain use-cases. The development documentation gives a pretty cle...
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In the last article we introduced the next section in our series: graphs. Graphs are super important because essentially every major problem involved on the web can be represented as a graph. Now that we know what kinds of graphs there are and what data structures we can use to represent them, it’s time to start traversing them so we can discover every vertex and edge in a graph.
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I just had a discussion with a colleague about a fix of non trivial code. The question was what comments should go into the code to explain what was going on. If you care to know, this related to the prefetching strategy that is used by RavenDB to reduce the amount of I/O that is required (especially on slow disks). The details don’t actually matter. The problem is that there are multiple relatively complex issues there, from managing I/O ....
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What happens when a browser loads a page? Do you know how the internals of browsers work to turn the JavaScript code you write into something usable by your computer? What happens if you want to run that same JavaScript code on your laptop instead of the browser?
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In this tutorial, I will show you a simple way to RIP DVD into a single file using FFmpeg command line tool in Linux. Install FFmpeg in Ubuntu/Debian/Linux Mint # sudo apt-get install ffmpeg Now copy contents of your DVD to local directory and cd into VIDEO_TS directory Note: If you want to RIP the DVD directly without copying it to the local directory first , then you need to modify last part of the below commands to : /home/you....
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I have spent a good portion of my evenings during the last two weeks working with a piece of community software called Discourse.
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Sometime around September 15th I looked at the date and realized I hadn’t been reading anything for me. I had been reading fairly regularly to my son - a dozen or so different books in September - but I must’ve been too busy for myself.
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Update It would appear that the latest version of Xcode has removed the macOS_SDK_headers_for_macOS_10.14.pkg file. I am currently searching for alternative solutions. While trying to compile PHP extensions after installing macOS Mojave, I was butting up against a ton of missing header file errors including php.h and zlib. After several hours of beating my head against my desk and Googling/Stack Overflowing I found the solution. Ends ..
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Update It would appear that the latest version of Xcode has removed the macOS_SDK_headers_for_macOS_10.14.pkg file. I am currently searching for alternative solutions. While trying to compile PHP extensions after installing macOS Mojave, I was butting up against a ton of missing header file errors including php.h and zlib. After several hours of beating my head against my desk and Googling/Stack Overflowing I found the solution. Ends ..
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Now that we’re done with searching and sorting on basic data structures, it’s time to dive into the most applicable data structure in all of computers: graphs.
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Open source software has had a powerful effect on computing. When the ARPANET/NSFNET was sold to different companies in the 1990s to create the commercial Internet, nobody expected it to grow as fast as it did. It was the open source Apache Web server running on the open source Linux (and BSD UNIX) operating system that ultimately allowed the Internet to grow quickly and attract the attention of the world. Apache on Linux allowed anyone wi..
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Open source software has had a powerful effect on computing. When the ARPANET/NSFNET was sold to different companies in the 1990s to create the commercial Internet, nobody expected it to grow as fast as it did. It was the open source Apache Web server running on the open source Linux (and BSD UNIX) operating system that ultimately allowed the Internet to grow quickly and attract the attention of the world. Apache on Linux allowed anyone wi..
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It’s the little three-digit number that people obsess over as if it’s the final grade in the school of life. It affects the interest rate of loans you may get - or even if you qualify for a loan in the first place. Nowadays, it can even affect things not normally associated with “credit” such as insurance and utilities.
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If you’re working with public APIs a common security task is to verify request signatures to prove the request is coming from who you believe you are really talking to.
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Einstein’s had a lot of witty and profound sayings, but “The definition of insanity is doing the same thing over and over again and expecting a different result” is not one of them . And yet, these words had often been misattributed to him. It is not exactly clear who came up with the phrase, but it is a fact that a lot of people got convinced that originated behind the famous mustache of Einstein. He was one of the giants of science in ....
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The website FontStruct allows even novice users to create their own personal font from scratch. A very simplified procedure: you sign up and you are ready to compose your font. Everything is offered through a simple interface as a free service. Not bad for a free service! -Continue to read the article on SerHack.me
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Here is a playbook for Ansible to install Docker and Docker Compose on Debian. You can of course, use a role from Galaxy. You have Gerling’s version or Debops (Ansible stack for Debian). But here I wanted to implement the install guide from Docker – and translate this into an Ansible playbook (which then should be turn into a custom role for more reusability). The official guide give use the following install steps:
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Here is a playbook for Ansible to install Docker and Docker Compose on Debian. You can of course, use a role from Galaxy. You have Gerling’s version or Debops (Ansible stack for Debian). But here I wanted to implement the install guide from Docker – and translate this into an Ansible playbook (which then should be turn into a custom role for more reusability). The official guide give use the following install steps:
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Build and Run (Standalone) · sumneko/lua-language-server Wiki · GitHub . how to lua and c - a short novel . Lua Digest . Lua tables (Hacker News) .
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