Oracle

ORA-12899: importing a .dmp file + character set conversion

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https://www.queryxchange.com/q/7_17504/ora-12899-importing-a-dmp-file-character-set-conversion/ You can edit the dump file and change the included NLS_LENGTH_SEMANTICS from BYTE to CHAR. Near the beginning of the file you find a line ending like this : ^@02:00:^@^@^D^@BYTE^F^@UNUSED^A^@2^K^INTERPRETED^K^@DISABLE:ALL^@^@ Change BYTE to CHAR using your favorite text editor and save the file. When you will imp that new dump file, all columns will be create […]

Uncategorised

Installing FreeBSD

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Общие рекомендации: Режим загрузки в BIOS: LEGACY (aka BIOS) – партиционирование GPT – размер swap = объем RAM – основные партиции: freebsd-boot = 512K freebsd-ufs (/) = 3GB freebsd-swap (= RAM) freebsd-ufs (/var) = 2GB freebsd-ufs (/tmp) = 2GB freebsd-ufs (/usr) = 10GB файловая система UFS Иногда бывает, что система не грузится с диска после […]

Linux

Installing CentOS

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Установка CentOS LVM не используем По умолчанию на небольшой диск (< 2TB) Linux пытается установить MBR. Чтобы выбрать EUFI (GPT) либо выбираем ее как основной способ загрузки в BIOS, либо выбираем в качестве первого загрузочного устройства USB-флэшку, с которой проводим инсталляцию, тогда программа установки сама переключится на EUFI. Если используется EUFI, дополнительно к стандартным разделам […]

General programming

Shodan

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Shodan is a search engine for Internet-connected devices. Web search engines, such as Google and Bing, are great for finding websites. But what if you’re interested in measuring which countries are becoming more connected? Or if you want to know which version of Microsoft IIS is the most popular? Or you want to find the […]

General programming

Introduction to libuv

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https://eli.thegreenplace.net/2017/concurrent-servers-part-1-introduction/ https://github.com/libuv/libuv   Abstracting away event-driven loops with libuv In part 3, we’ve seen how similar select-based and epoll-based servers are, and I mentioned it’s very tempting to abstract away the minor differences between them. Numerous libraries are already doing this, however, so in this part I’m going to pick one and use it. The library I’m picking […]

Linux

Unix monitoring and audit

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https://cisofy.com/lynis/ Lynis is an open source security auditing tool. Used by system administrators, security professionals, and auditors, to evaluate the security defenses of their Linux and Unix-based systems. It runs on the host itself, so it performs more extensive security scans than vulnerability scanners. It is also the client in our Lynis Enterprise offering. https://www.tecmint.com/linux-server-health-monitoring-script/  

General programming

General computer science articles

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https://github.com/aphyr/distsys-class https://github.com/heathermiller/dist-prog-book http://book.mixu.net/distsys/index.html The course aims to introduce software engineers to the practical basics of distributed systems, through lecture and discussion. Participants will gain an intuitive understanding of key distributed systems terms, an overview of the algorithmic landscape, and explore production concerns.  

General programming

Anasysis of databases (Jepsen)

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https://jepsen.io/analyses Over the past four years, Jepsen has analyzed over two dozen databases, coordination services, and queues—and we’ve found replica divergence, data loss, stale reads, lock conflicts, and much more. Here’s every analysis we’ve published.