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Hi Max-Max
I understand you’re trying to modify the ‘gtid_mode’ parameter on a custom parameter group of a MySQL8.0 version, but were unable to. I created a custom parameter group on my side for MySQL8.0 version, I then filtered the parameters by typing ‘gtid’ in the search bar, and found two parameters ‘gtid_mode’ (cannot be modified) and ‘gtid-mode’ (can be modified). To solve your issue, you will need to change the parameter values for ‘grid-mode’ instead of ‘gtid_mode’ since.
Please Note:
- you can verify that a parameter is modifiable by checking if the parameter's property value for “Is Modifiable” is “true”.
- You also need to set the value of the ‘enforce_gtid_consistency’ parameter to ON, or else you will be prevented from saving any changes made to the ‘gtid_mode’ parameter and receive an error :
Error saving: Having gtid-mode set to ON requires that enforce_gtid_consistency is also set to ON. (Service: AmazonRDS; Status Code: 400; Error Code: InvalidParameterValue; Request ID: bf022269-8eba-4ad6-a620-14d31c39f55e; Proxy: null)
- The ‘gtid-mode’ and ‘enforce_gtid_consistency’ parameters are both static parameters, this means that in order for the changes to take effect, you will need to reboot your DB instance.
Here is an AWS document that may help in troubleshooting your issue: https://aws.amazon.com/premiumsupport/knowledge-center/rds-modify-parameter-group-values/
I hope this helps
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