Tewolde Luwam

Tewolde Luwam

1600195740

Connect Migration Store for express

connect-migration-store

Connect Migration Store for express

This lib is here to help you migrate from an existing session store to another without disconnecting your users.

Installation

Project can be found on npm, and installed with a classic npm i.

  npm install --save connect-migration-store

Usage

To use migration store, you need to instantiate your migration store with two store: the original one you want to migrate from, and the new one you want to migrate to. Then you can feed it to the session express middleware.

Here is below an example migrating from redis to dynamodb:

const express = require('express');
const session = require('express-session');
const DynamoDBStore = require('connect-dynamodb')({session});
const RedisStore = require('connect-redis')(session);
const MigrationStore = require('connect-migration-store')(session);

// Store creation
const originalStore = new RedisStore({url: 'some-redis-url'});
const newStore = new DynamoDBStore({table: 'some-dynamodb-table'});
const migrationStore = new MigrationStore({from: originalStore, to: newStore})

// instiate app with express then load session middleware with migration store
const app = express();
app.use(session({store: migrationStore, secret: '42'});
// and do what you need with your server

Then deploy, let it in place for few days, the duration of your migration. Then you can remove it and replace it with the new store. Your migration is now complete 😉

Download Details:

Author: CoorpAcademy

Source Code: https://github.com/CoorpAcademy/connect-migration-store

#nodejs #node #javascript

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Connect Migration Store for express
Adaline Kulas

Adaline Kulas

1594166040

What are the benefits of cloud migration? Reasons you should migrate

The moving of applications, databases and other business elements from the local server to the cloud server called cloud migration. This article will deal with migration techniques, requirement and the benefits of cloud migration.

In simple terms, moving from local to the public cloud server is called cloud migration. Gartner says 17.5% revenue growth as promised in cloud migration and also has a forecast for 2022 as shown in the following image.

#cloud computing services #cloud migration #all #cloud #cloud migration strategy #enterprise cloud migration strategy #business benefits of cloud migration #key benefits of cloud migration #benefits of cloud migration #types of cloud migration

Seamus Quitzon

Seamus Quitzon

1595205213

How to perform migration rollback in laravel

As we know that laravel migration provides very simple way to create database table structure. We need to create migration file and write table structure then migrate that migration. Sometimes we need to rollback that migration. So here we will discuss about the migration rollback in laravel.

We can run the rollback artisan command to rollback on a particular step. We can execute the following artisan command.

php artisan migrate:rollback --step=1

Every time when we will rollback, we will get the last batch of migration.

**Note: **This rollback command will work on laravel 5.3 or above version. For the version below 5.3, there is no command available for migration rollback in laravel.

We can also use the following command to rollback and re migrate.

php artisan migrate:refresh --step=2

It will rollback and remigrate last two migration.

You can also checkout the article for executing single migration by clicking on the link below.

How to migrate single migration in laravel

#laravel #how to perform rollback migration in laravel #laravel migration rollback #migration refresh in laravel #migration rollback batch in laravel #migration rollback for one specific migration #migration rollback in laravel

Destiny Volkman

Destiny Volkman

1597222800

PostgreSQL Connection Pooling: Part 4 – PgBouncer vs. Pgpool-II

In our previous posts in this series, we spoke at length about using PgBouncer  and Pgpool-II , the connection pool architecture and pros and cons of leveraging one for your PostgreSQL deployment. In our final post, we will put them head-to-head in a detailed feature comparison and compare the results of PgBouncer vs. Pgpool-II performance for your PostgreSQL hosting !

The bottom line – Pgpool-II is a great tool if you need load-balancing and high availability. Connection pooling is almost a bonus you get alongside. PgBouncer does only one thing, but does it really well. If the objective is to limit the number of connections and reduce resource consumption, PgBouncer wins hands down.

It is also perfectly fine to use both PgBouncer and Pgpool-II in a chain – you can have a PgBouncer to provide connection pooling, which talks to a Pgpool-II instance that provides high availability and load balancing. This gives you the best of both worlds!

Using PgBouncer with Pgpool-II - Connection Pooling Diagram

PostgreSQL Connection Pooling: Part 4 – PgBouncer vs. Pgpool-II

CLICK TO TWEET

Performance Testing

While PgBouncer may seem to be the better option in theory, theory can often be misleading. So, we pitted the two connection poolers head-to-head, using the standard pgbench tool, to see which one provides better transactions per second throughput through a benchmark test. For good measure, we ran the same tests without a connection pooler too.

Testing Conditions

All of the PostgreSQL benchmark tests were run under the following conditions:

  1. Initialized pgbench using a scale factor of 100.
  2. Disabled auto-vacuuming on the PostgreSQL instance to prevent interference.
  3. No other workload was working at the time.
  4. Used the default pgbench script to run the tests.
  5. Used default settings for both PgBouncer and Pgpool-II, except max_children*. All PostgreSQL limits were also set to their defaults.
  6. All tests ran as a single thread, on a single-CPU, 2-core machine, for a duration of 5 minutes.
  7. Forced pgbench to create a new connection for each transaction using the -C option. This emulates modern web application workloads and is the whole reason to use a pooler!

We ran each iteration for 5 minutes to ensure any noise averaged out. Here is how the middleware was installed:

  • For PgBouncer, we installed it on the same box as the PostgreSQL server(s). This is the configuration we use in our managed PostgreSQL clusters. Since PgBouncer is a very light-weight process, installing it on the box has no impact on overall performance.
  • For Pgpool-II, we tested both when the Pgpool-II instance was installed on the same machine as PostgreSQL (on box column), and when it was installed on a different machine (off box column). As expected, the performance is much better when Pgpool-II is off the box as it doesn’t have to compete with the PostgreSQL server for resources.

Throughput Benchmark

Here are the transactions per second (TPS) results for each scenario across a range of number of clients:

#database #developer #performance #postgresql #connection control #connection pooler #connection pooler performance #connection queue #high availability #load balancing #number of connections #performance testing #pgbench #pgbouncer #pgbouncer and pgpool-ii #pgbouncer vs pgpool #pgpool-ii #pooling modes #postgresql connection pooling #postgresql limits #resource consumption #throughput benchmark #transactions per second #without pooling

Fredy Larson

Fredy Larson

1595202210

How to migrate single migration in laravel

Sometimes while working on a laravel application, we just need to migrate only single or specific migration. If we run normal migrate command it will migrate all the migrations written in the application. Here i will let you know to migrate single migration in laravel.

Migrations play very important role for aplication’s database structure. We just need to create migrations in the application for each table which you want and whenever we migrate these migrations. New table structure would be created.

For new developers or setting up new environment, we do not need to backup of table structure. We will just need to run the migrations. It will automatically create desired tables in the database connected from the laravel application.

We can run all the migrations using the command below.

php artisan migrate

Now if we want to run only one migration or a specific migration, we will need to define a path parameter and will need to specify the path of that migration file which we want to run like below.

php artisan migrate --path=/database/migrations/my_migration.php

It will migrate only my_migration.php file. Here, you will need to replace file name from your own migration file.

You can also learn how to add column in existing daatbase table through migration by clicking on the below.

#laravel #how to migrate single migration file #laravel migration #laravel single migration #migrate specific migration in laravel

Bradley Jackson

Bradley Jackson

1625631360

Upload and Store Images in MySQL using Node.Js, Express, Express-FileUpload & Handlebars

Today we are going to explore the basic usage of Express-FileUpload. In addition to this, I will show you how you can save/update a user record with a profile image that you can upload.

Source Files:
https://raddy.co.uk/blog/upload-and-store-images-in-mysql-using-node-js-express-express-fileupload-express-handlebars/

Chapters:
0:00 Introduction:
1:16 NPM Project Setup
3:54 Creating Express Server
5:51 Setting up Layouts & Routes
9:46 Express Upload Form
21:50 User Card
33:40 Database
52:05 Ending

Credit:
Icons www.flaticon.com
Cat photo by Cédric VT on Unsplash
Upload Icon by Gregor Cresnar www.flaticon.com

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#node.js #express #express-fileupload #express-handlebars #mysql #upload and store images