Harvard CS50 – Free Computer Science University Course
https://www.freecodecamp.org/news/harvard-cs50/
https://www.freecodecamp.org/news/harvard-cs50/
freeCodeCamp.org
Harvard CS50 – Free Computer Science University Course
Harvard University's CS50 is one of the most popular beginner computer science courses in the world. We just released the entire CS50 course–all 25 hours–on the freeCodeCamp.org YouTube channel. David J. Malan is widely considered to be one of the b...
Designing_Data_Intensive_Applications_The_Big_Ideas_Behind_Reliable.pdf
23.8 MB
Designing Data-intensive applications
Building a Scalable Event-Driven Search Architecture With Postgres’ Full-Text Search | by Jawad Margieh | Nov, 2022
https://betterprogramming.pub/building-a-scalable-event-driven-search-architecture-with-postgres-full-text-search-4780b87a34ef
https://betterprogramming.pub/building-a-scalable-event-driven-search-architecture-with-postgres-full-text-search-4780b87a34ef
Medium
Building a Scalable Event-Driven Search Architecture With Postgres’ Full-Text Search
Designing full-text search based on Postgres with event-driven architecture
Add analytics.js to Your Site | Analytics for Web (analytics.js) | Google Developers
https://developers.google.com/analytics/devguides/collection/analyticsjs
https://developers.google.com/analytics/devguides/collection/analyticsjs
Google for Developers
Google Analytics | Google for Developers
Coursera | Online Courses & Credentials From Top Educators. Join for Free | Coursera
https://www.coursera.org/account/accomplishments/verify/H4FX7NRL7EUQ
https://www.coursera.org/account/accomplishments/verify/H4FX7NRL7EUQ
Coursera
Completion Certificate for Crash Course on Python
This certificate verifies my successful completion of Google's "Crash Course on Python" on Coursera
Build Blazing Fast REST Api using Django + Elasticsearch + Haystack
https://selftaughtdev.me/build-blazing-fast-rest-api-using-django-elasticsearch-haystack
https://selftaughtdev.me/build-blazing-fast-rest-api-using-django-elasticsearch-haystack
Forwarded from Engineering Notes
Isolation – izolyatsiya
Hali tugallanmagan trakzaksiyadagi ma'lumotlar tashqaridan (boshqa tranzaksiyalardan va tranzaksiya tashqarisidagi boshqa operatsiyalardan) izolyatsiyalanishi kerak. Ya'ni tranzaksiya tugamagunicha ichkaridagi ma'lumot tashqariga ko'rinmasligi kerak.
Masalan, tepadagi misolda hisobingizdan pul yechildi, lekin hali do'stingizga tushmadi. Shu vaziyatda, hali tranzaksiya tugamasidan balansingiz tekshirilganida kamaygan qiymat emas, tranzaksiyadan tashqaridagi, oldingi qiymat ko'rinishi kerak.
To'liq izolyatsiya ko'p resurs va vaqt talab qilgani uchun va doim ham to'liq izolyatsiya zarur bo'lmagani uchun tranzaksiya izolyatsiyasining 4 ta standart darajalari bor. Ular tezlik, resurslar sarfi va xavfsizligi jihatidan bir-biridan farq qiladi. Endi bu boshqa kun uchun boshqa mavzu.
Durability – ishonchlilik
Tranzaksiya muvaffaqiyatli yakunlangani haqida xabar berilganida tranzaksiyadagi o'zgarishlar to'liq diskda saqlangan bo'lishi va ma'lumot yo'qotilmasligi kerak.
Masalan, do'stingizga muvaffaqiyatli pul o'tkazganingiz haqidagi xabar olganingiz va shu vaqtda serverda xatolik chiqib, o'chib qoldi. Qayta yoqilgandan keyin balansingizni tekshirganingizda esa pul o'tkazishdan oldingi, eski qiymatni ko'rdingiz. Demak, tranzaksiya muvaffaqiyatli deb belgilangan bo'lsa ham natijalar o'chib ketgan. Xuddi shu holat esa durability qoidasini buzadi.
Qisqasi, mana shu 4 ta qoida ma'lumotlar buzilishi bilan bog'liq ko'p bosh og'rig'idan saqlaydi.
Maqola foydali bo'lgan bo'lsa tanishlarga yuborib qo'ying.
@boboshersnotes
Hali tugallanmagan trakzaksiyadagi ma'lumotlar tashqaridan (boshqa tranzaksiyalardan va tranzaksiya tashqarisidagi boshqa operatsiyalardan) izolyatsiyalanishi kerak. Ya'ni tranzaksiya tugamagunicha ichkaridagi ma'lumot tashqariga ko'rinmasligi kerak.
Masalan, tepadagi misolda hisobingizdan pul yechildi, lekin hali do'stingizga tushmadi. Shu vaziyatda, hali tranzaksiya tugamasidan balansingiz tekshirilganida kamaygan qiymat emas, tranzaksiyadan tashqaridagi, oldingi qiymat ko'rinishi kerak.
To'liq izolyatsiya ko'p resurs va vaqt talab qilgani uchun va doim ham to'liq izolyatsiya zarur bo'lmagani uchun tranzaksiya izolyatsiyasining 4 ta standart darajalari bor. Ular tezlik, resurslar sarfi va xavfsizligi jihatidan bir-biridan farq qiladi. Endi bu boshqa kun uchun boshqa mavzu.
Durability – ishonchlilik
Tranzaksiya muvaffaqiyatli yakunlangani haqida xabar berilganida tranzaksiyadagi o'zgarishlar to'liq diskda saqlangan bo'lishi va ma'lumot yo'qotilmasligi kerak.
Masalan, do'stingizga muvaffaqiyatli pul o'tkazganingiz haqidagi xabar olganingiz va shu vaqtda serverda xatolik chiqib, o'chib qoldi. Qayta yoqilgandan keyin balansingizni tekshirganingizda esa pul o'tkazishdan oldingi, eski qiymatni ko'rdingiz. Demak, tranzaksiya muvaffaqiyatli deb belgilangan bo'lsa ham natijalar o'chib ketgan. Xuddi shu holat esa durability qoidasini buzadi.
Qisqasi, mana shu 4 ta qoida ma'lumotlar buzilishi bilan bog'liq ko'p bosh og'rig'idan saqlaydi.
Maqola foydali bo'lgan bo'lsa tanishlarga yuborib qo'ying.
@boboshersnotes