![]() Ensure there are no active transactions running.Ĭ. Check whether there are any active transactions (or) if any transactions pending with commit or rollback. This piece of information we can gather from versionI(), please note that the same commands works from PSQL and also from the pgAdmin console.ī. In this exercise, as said, we are upgrading Postgres from 9.4.9 to 9.5.4 and we can see the current version, where the database is running. Initially we will check what version we are using and what prerequisites should be performed. Now we have completed our RDS backup/snapshot from the cloud console. With our snapshot we can launch the instance at any time with the same configuration, which allows us great flexibility and quick availability. There will be a dedicated name for each snapshot, so we can accordingly uses names such as “final snapshot” or “before upgrade” as applicable.Ĭlick on “Take Snapshot” RDS will create the snapshot and this process is very quick. We can access this from the instance as shown below. In the case of AWS, we call the backup method that creates a complete backup of the service “Take Snapshot”. ![]() Take the backup/snapshot in AWS versionīackup of a Postgres database is generally performed by SQL Dump or file system level backup or continuous archiving. We will proceed with the prerequisites of the upgrade and then we will continue with the actual upgrade of the Postgres database engine.ġ. PSQL is a traditional utility to access the database, while pgAdmin supports a GUI interface. In this article we have used the pgAdmin utility to manage the database instead of PSQL. For instance, taking cold backups prior to upgrade, performing complete prerequisites, checking the known issues, so on. Amazon RDS supports in-place upgrades starting from 9.3.x to 9.6.x.īefore getting into the actual upgrade process through RDS, planning is key, as always in upgrades or migrations. In-place upgrade – no need to copy user data to upgrade between software versions. In-Place/PG_UPGRADE: In this upgrade method, the changes and upgrades happen on the existing binaries and the same data structures there is the risk of failure in the upgrade process hence, we should handle this carefully, using best practices. Verify the configuration files ex: /opt/PostgreSQL/9.4.xĬreate an empty database using “create database”, psql,or pgadmin The benefit of this approach: no risk, as we always have our database in the older version.Ī. The image below shows how an out-of-place upgrade actually works. Out-of-place/Dump & Load: In this method we are going to install the new Postgres binaries and then we will move the data from the old version to the new version. Let’s look at a few examples showing the difference between the in-place and out-of-place upgrades. In a major version upgrade there will definitely be changes in the datafiles structure.Ī Postgres database can be upgraded either in-place or out-of-place. The source database can be either 9.4.4 or 9.4.x. This kind of version upgrade is considered a major upgrade. Let’s suppose Postgres is running on 9.4.4 and we are upgrading to 9.5. If the database version is 9.4.4 upgrading to 9.4.5 then this kind of upgrade is minor version upgrade this upgrade we can automate from the Amazon console without user intervention and of course we can disable this option if we prefer that the upgrades be done manually. Let us understand the difference between version upgrades. RDS allows us great flexibility in automating minor version upgrades. In this article we are using RDS with Postgres 9.4.9. With RDS everything is installed, including database creation. Of course, apart from RDS, we can launch in EC2 as well but in EC2 we have to handle the installation. For Postgres, RDS lets us launch the instances starting from 9.3.1 until 9.6.1 and it gives the user a lot of control to scale the service as required. In this article we will see how to upgrade Postgres from 9.4 to 9.5 when the database is hosted on Amazon RDS, and compare traditional upgrade with performing upgrades through Amazon RDS.Īmazon Relational Data Services offers direct launch of databases such as Postgres, Oracle, MySQL and so on. When upgrading the database engine, irrespective of whether it is Postgres or any other database, it is necessary to fix existing bugs and to get the new features of the new releases or versions.
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