We chose JSON because JSON is the native format for data in JavaScript, and PostgreSQL has extensive support of JSON compared to XML. In this post, we discuss a solution that uses the JSON data type instead of XML to migrate stored procedures from Oracle to PostgreSQL and reduce migration efforts. Moreover, converting procedures to Aurora PostgreSQL or Amazon RDS for PostgreSQL could be a cumbersome and time-consuming process depending on the amount of stored procedures dependent on the DBMS_XMLDOM package. This is because the DBMS_XMLDOM package isn’t supported in Aurora PostgreSQL or Amazon RDS for PostgreSQL. This will allow the Postgres server to listen on the DNS name of the EC2 instance.Migrating from Oracle to Amazon Aurora PostgreSQL-Compatible Edition or Amazon Relational Database Service (Amazon RDS) for PostgreSQL may be challenging if the application is using the DBMS_XMLDOM package to access XML type objects. We will find the configuration entry listen_addresses and change it from the default setting to ‘*’. Open the file with your favourite text editor (yes, mine just so happens to be Nano #sorryNotSorry). In case you are not sure, you can use a handy Bash command to find it by entering: sudo find / -name "nf"
Log out from the postgres user account and go back to your default user by entering the following: exitįind the nf file (it’s usually in /etc/postgresql/12/main/nf).
AMAZON AWS POSTGRESQL IMAGES PASSWORD
sudo su postgres psql -U postgres -c "CREATE ROLE ubuntu " psql -U postgres -c "ALTER ROLE ubuntu WITH LOGIN " psql -U postgres -c "ALTER USER ubuntu CREATEDB " psql -U postgres -c "ALTER USER ubuntu WITH PASSWORD 'ubuntu' " I will simply name my user ubuntu and allow it to login and create databases. Next we will log in as the default Postgres user (imaginatively named postgres) and create the user roles we will be using.
AMAZON AWS POSTGRESQL IMAGES INSTALL
sudo apt-get update -y & sudo apt-get upgrade -y sudo apt install postgresql -y The first two lines will refresh the packages in Ubuntu and install the latest version of Postgres. Let's break down the commands outlined above. Lines 1 and 2 will refresh the packages and install the latest version of Postgres (image by author) In case you’d prefer to consume this guide in video format:
Now that we have that out of the way, let's get started. After the crisis has been resolved, they will automatically catch up the recovered master database and promote it. They will point your database host URL to the standby database if/when your primary database fails. Your application does not need to be able to detect database failure and handle fail-over.So having a standby replica in a different zone will ensure that even if the primary zone where your master database is hosted experiences an outage, your application will be able to fall back to the standby replica in a different (and presumably unaffected) zone. Amazon guarantees 99.99999% up-time for regions, not availability zones.It provides replication via a standby instance in a different availability zone and handles automatic fail-over. As a rule of thumb, if budget allows, always opt for RDS.
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