问题
I am running a MySQL database on RDS. I want to change all of my encodings to utf8mb4. I created a parameter group on RDS with all character_set_* parameters as utf8mb4, assigned it to my RDS instance, and then rebooted the instance. However, when I run SHOW VARIABLES LIKE '%char%' on my DB, there are still values of latin1, which I do not want:
character_set_client latin1
character_set_connection latin1
character_set_database utf8mb4
character_set_filesystem binary
character_set_results latin1
character_set_server utf8mb4
character_set_system utf8
character_sets_dir /rdsdbbin/mysql-5.6.22.R1/share/charsets/
Likewise, new columns that I create on the DB are latin1 encoded instead of utf8mb4 encoded. I can change the encoding values manually through the mysql command line, but this doesn't help since the values are also reset to latin1 when I push to production.
回答1:
I think this the issue is the distinction between VARIABLES and GLOBAL VARIABLES.
If you list the GLOBAL VARIABLES this should reflect what you see in your parameter group: (assuming you've rebooted as Naveen suggested)
SHOW GLOBAL VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';
This is opposed to what you see in your regular VARIABLES:
SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';
These can sometimes be overridden by the options supplied in the connection. eg connecting using the options --default-character-set:
mysql -h YOUR_RDS.us-east-1.rds.amazonaws.com -P 3306 --default-character-set=utf8 -u YOUR_USERNAME -p
回答2:
After changing the parameter group - do you the warning "Pending Reboot" in the console. If yes, try rebooting the DB Instance and the new character set would start be applied.
More information - http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_WorkingWithParamGroups.html
来源：https://stackoverflow.com/questions/30522939/aws-rds-parameter-group-not-changing-mysql-encoding