Engineering Operating Model

System Lifecycle

Design → Build → Verify → Release → Observe → Improve

Developer

praveen-krishn / System Design.md

Created October 9, 2023 04:38 — forked from vasanthk/System Design.md

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

praveen-krishn / mainpython.md

Created May 3, 2020 20:14 — forked from rochacbruno/mainpython.md

Use of __main__.py

The use of __main__.py to create executables

myprojectfolder/
    |_ __main__.py
    |_ __init__.py

Being __main__.py:

print("Hello")

praveen-krishn / latency.txt

Created July 29, 2019 06:34 — forked from jboner/latency.txt

Latency Numbers Every Programmer Should Know

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

praveen-krishn / pip install

Created April 27, 2018 08:22

pip install trusted host

pip install --trusted-host pypi.python.org --trusted-host pypi.org --trusted-host files.pythonhosted.org -r requirements.txt

praveen-krishn / autopgsqlbackup

Created July 10, 2017 04:34 — forked from matthewlehner/autopgsqlbackup

Auto PostgreSQL backup script.

	#!/bin/bash
	#
	# PostgreSQL Backup Script Ver 1.0
	# http://autopgsqlbackup.frozenpc.net
	# Copyright (c) 2005 Aaron Axelsen <axelseaa@amadmax.com>
	#
	# This script is based of the AutoMySQLBackup Script Ver 2.2
	# It can be found at http://sourceforge.net/projects/automysqlbackup/
	#
	# The PostgreSQL changes are based on a patch agaisnt AutoMySQLBackup 1.9

praveen-krishn / repository.txt

Last active June 29, 2017 06:10

python most used packages

	# pip install -r requirements.txt
	# refer https://pip.pypa.io/en/stable/reference/pip_install/#example-requirements-file
	# refer top packages @ http://pypi-ranking.info/alltime

	virtualenv # basic
	virtualenvwrapper # wrapper to virtualenvwrapper

	pep8 # Code Style Guide
	pycodestyle # enforces pep8 style,
	pylint # enforces pep8 style

praveen-krishn / git_demo.sh

Created November 25, 2016 04:14

	#!/bin/bash

	function seed {
	echo $1 >> $2;
	git add $2;
	git commit -m "$1";
	}

	rm -rf .git
	git config --global core.editor vim

praveen-krishn / git-cheatsheet.txt

Last active November 25, 2016 04:17

	----

	To Create Stash
	$ git stash

	To List all stash
	$ git stash list

	To apply and not delete from stash
	$ git stash apply stash@{0}

praveen-krishn / ora_impdp_expdp

Last active August 9, 2016 05:48 — forked from bulain/ora_impdp_expdp.bat

using expdp and impdp in oracle 10g 11g

	# For remote usage: https://oracle-base.com/articles/10g/oracle-data-pump-10g
	# create directory
	create directory dmpdir as 'c:/temp';
	select directory_name,directory_path from dba_directories;

	# expdp owner
	create user scott identified by tiger;
	grant connect, resource to scott;
	...
	grant read, write on directory dmpdir to scott;