About OTC CatchUp

Note OTC CatchUps are weekly informal sessions involving project showcases and technical discussions. They are held every Saturday from 10:30 PM IST. Join in!.
For all summaries, please visit catchup.ourtech.community/summary.

OTC CatchUp #42

Date: 28-08-2021

Duration: 7 hr 18 min

Topics Discussed

  • General introductions.

  • @Harsh Kapadia told everyone about CSS clamp() for responsive font sizes.

  • Krishna Gadia explained what the Linux command rm -rf / does.

    • rm stands for 'remove'. It deletes files or directories

    • -r is a flag (option) that stands for 'recursive' and targets directories and files within directories till the bottommost level.

    • -f is a flag (option) that stands for 'force' and forces the command to delete all protected files. Basically allows a force delete.

    • / is the path to delete files from and '/' indicates the root folder and thus this command deletes every file present on a machine, including the OS. Only files loaded in the RAM make things work till the machine is not powered off. It won’t restart.

    • It would be advisable to do this only in a new Docker container.

  • GitHub CodeSpaces, GitPod and KataCoda are based on Docker containers.

  • @Jay Kaku, Krishna Gadia and Santhoshi talked about a Garden Watering hardware idea for automatic sprinkler switching on and off. It was a long drawn out exciting discussion with things like solenoids, DC motors, servo motors, step motors, H bridges, Arduino Driver Shields, Power Shields and other hardware components being discussed.

  • @Kartik Soneji and Krishna Gadia told us about NoSQL and SQL vs columnar and row-based databases.

    • NoSQL and SQL is not related to columnar and row-based DBs. Columnar and row-based DBs are named on the basis of how data is stored. Columnar DBs have columns stored together on the disc while row-based DBs are stored row-wise on disc.

    • Columnar databases are mostly used for analytical querying in OLAP scenarios and row-based databases which are more efficient for querying are used in OLTP scenarios because of varying use cases.

    • Query syntax is the same.

    • MariaDB can handle both columnar and row-based data storage depending on the flags passed.

  • We talked about why denormalized data is good for analytical purposes.

Projects Showcased

  • @Omraj Sharma showcased his design ideas for Instagram and Tinder. (Dribbble)

  • @Sreekaran Srinath showcased his portfolio sreekaran.com.

  • Krishna Gadia showcased his hardware project using which he had made two games (Car Racer and Frog). He had used a RPi with a Sense HAT mounted on it.

  • We talked about how big companies take over small companies for their patents.

  • @sirus told about the story of Motorola and how it got split in 2 division.

Meet Screenshot

Meet #42 screenshot
Note For all summaries, please visit catchup.ourtech.community/summary.

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