January 2018 ~ DataGenX

Tuesday, 16 January 2018

Python Pickle - to save your efforts

by Unknown / in data, dataframe, dataset, Learning, Library, Pickle, Python, Tutorial /

This tutorial is for Python beginners who just started getting dirty in Python :-) Lots of time when we are working on some data set and completed lots of cleaning and pre-processing steps, It's advisable from GURUs to save that intermediary dataset to avoid the re-do all the steps if something unexpected happen with Python, Jupyter notebook or your system for rebooted without your permission, weird though :-/

So, let's learn how to save any dataset or variable with Pickle library -

To Import:

To Save:

To Read:

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Mongo DB - Installation and Configuration

by Unknown / in Administration, commands, Concept, Configuration, Database, DBMS, install, Linux, MongoDB, NoSQL /

MongoDB is an open-source document database, and the leading NoSQL database. Written in C++.

MongoDB features:
    Document-Oriented Storage
    Full Index Support
    Replication & High Availability
    Auto-Sharding
    Querying
    Fast In-Place Updates
    Map/Reduce
    GridFS

Reduce cost, accelerate time to market, and mitigate risk with proactive support and enterprise-grade capabilities.

Today, We will see how to install and run the MongoDB.

MongoDB Installation on Linux

1. DOWNLOAD the stable version of MongoDB. It will a tar file
2. Extract the tar file to some directory.

$ tar -xvf mongodb.tar -C /learn/mongodb

3. change the permisson of folder to user who run the db here- In my case User - hduser and Group - hadoop
$ chown -R hduser:hadoop /learn/mongodb

4. Add the env var in .bashrc
export MONGO_HOME=/learn/mongodb
export PATH=$PATH:$MONGO_HOME/bin

5. Create the default DB directory for Mongo
$ mkdir -R /data/db
$ chown -R hduser:hadoop /data/db
This is by default, you can specify ur db path when starting the mongo db

$ mongod --dbpath /app/mongodata
this command will start the mongodb. in other terminal you can start work on db. "--dbpath /app/mongodata" is totally optional

If you just use just $ mongod , it will start n use the default db which we have defined in step 5.