![]() In this case, the upgrade process is not straight-forward and is definitely not risk-free. Even MySQL 5.6 is going out of support soon. MySQL 5.5 is ancient by now, and it definitely makes sense to upgrade. The replica could be useful as a temporary data source, while any unexpected issues with the new version are addressed. Even though it is not supported officially, replication from a higher to lower MySQL version is possible most of the time. One possibility is to create an external replica. Since there is no mention of any rollback mechanism in the communication, you need to think about the strategy if things go wrong past the point of no return. To be on the safe side, a new full backup should be taken right after the upgrade. It is not clear what will happen with snapshots from the old version. Luckily, the MySQL manual provides a list of reserved words for each version. ![]() Any reserved keywords will cause syntax errors on the new version, potentially breaking your application. It is a good practice to check for new reserved words usage prior to doing a database upgrade. For more information check out the article about Upgrading to MySQL 5.7 focusing on temporal types. We can avoid this by converting tables on a read replica, and then promoting it to primary. This happens at upgrade time by default – more precisely while running mysql_upgrade script. This means old 5.5 tables using such columns have to be rebuilt, which can be a lengthy process. Starting with MySQL 5.6, the datetime columns have microsecond precision. It is of utmost importance to do regression testing in advance of the upgrade to avoid any unpleasant surprises. There is even the possibility of some queries starting to do a full table scan, in spite of them using an index before. Some will be faster, some will be slower. Here is a list of other important issues you need to be aware of: Query Regressionsīy far the most common issue, some queries will perform differently in 5.7 due to changes in the optimizer code. Remember you don’t have access to the underlying instance. If there are issues with any of the restarts, you will need to depend on AWS support to help you. This means instances need to be restarted twice first to go from 5.5 to 5.6, and then from 5.6 to 5.7.Īs per the RDS upgrade guide, any read replicas are upgraded first, while the primary instance is upgraded last. Since a direct upgrade from 5.5 to 5.7 is not supported, we need to go through 5.6 first. I think we can safely assume that the upgrade will be performed in-place, as it would be too complex and time-consuming otherwise. If you don’t have a maintenance window defined, RDS will automatically upgrade you on March 9 00:00 UTC and there is no opt-out.Īs any seasoned administrator knows, upgrades can be painful and things might go wrong.AWS will upgrade RDS instances to MySQL 5.7 starting Febru00:00 UTC during your next defined maintenance window, provided you have one.Using our upgrading consulting service can help you not only with the upgrade but also with our experienced recommendations on how to make your database scale better in the future.As mentioned in the AWS discussion forum back in October, Amazon has started the end of life (EOL) process for RDS MySQL version 5.5. We’ve been an integral part of a wide range of businesses since 2015, offering database assistance, day-to-day operational responsibilities, and a variety of engineering activities. ![]() For a seamless upgrade, you must first understand your database structure, data flow from the application, schemas, tables, and queries, among other factors. Mydbops can help you create a well-thought-out upgrade strategy. You can speak to an Database connoisseur like us. Yes, assuming you can hire the proper applicant, complete paperwork, induct new employees, impart data flow knowledge, and much more in less than 45 days. However, is it possible to hire database experts to take care of both operational & engineering activites for the upgrade? It is a quandary when you don’t have a team to stabilize the aftermath. Listed below are the significant impact which few organization face after the automatic upgrade: Whilst, the upgrade seems to be automatic but sometimes the aftermath is catastrophic. ![]() If you’re thinking to yourself, “It’s an automatic update, so why should I care?” the answer is no. Starting, September 1st 2021, RDS will any remaining MySQL 5.6 instances to version 5.7 whether or not they are in a maintenance window. Starting, August 3rd 2021, RDS will automatically upgrade MySQL 5.6 instances to version 5.7 within the earliest scheduled maintenance window that follows. If you haven’t already upgraded to MySQL 5.6, NOW IS THE TIME!!
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