See the RPi connection diagram in the sellers listing. The converter in your link will work as long as you power the board with 3V3 to the VCC. Would a converter like this really be enough to keep my Raspberry Pi safe from the dreaded blue smoke, or is there something critical I'm missing here? Apologies once again if this is an idiotic question, I'm coming from a mostly software-oriented background and I'd like to immerse myself more in hardware and electronics, and I'm not entirely sure of what is generally expected of small boards like this converter. If I'm correct in my assumption, TTL runs at 3.3v, while RS232 is at 5v, and I obviously don't want to overvolt my Pi (in the board's defense, "death by serial cable" isn't exactly how I'd want to go out either). However, I'm a bit concerned about voltage. I understand that, in order to do this, I have to use an RS232-to-TTL converter and wire it up to the board's UART pins (and, subsequently, use a serial cable and connect the converter to the terminal). I'm looking to connect a Raspberry Pi 2 Model B to an old-school dumb terminal over RS232. I'm also a bit new to electronics and wiring so forgive me if this is a dumb question. advertisements for limited time offers and discounts etc.Hello, everyone! Long-time owner (well, if two years counts as "long") first-time poster.We want data entries/rows to be deleted automatically when the database table starts overflowing and our database memory reaches the max limit after a set time without manually writing cron jobs.įew types of data that need to be cleaned periodically are: □ A background thread in mongod reads the values in the index and removes expired documents from the collection. □ TTL indexes are special single-field indexes that MongoDB can use to automatically remove documents from a collection after a certain amount of time or at a specific clock time. How to do this is currently not possible with Prisma (unless editing the generated SQL). We are currently working on an app using Prisma with Postgres, and we wanted to set expiration time for entries in a row, something already available in Redis, Mongo and also Postgres (using TRIGGERS) or storing a timestamp and then manually code some sort of cron job to check what entries have expired. Create Time to Live (TTL) indexes on the model and let database do it automatically.
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February 2023
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