Set MySQL server variable collation_connection to utf8_unicode_ci on AWS RDS

user_292106 0
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So my goal is to set all the character sets and collations to utf8 and utf8_unicode_ci.

Im using an AWS RDS to host the MySQL server.

Ive set the collation_connection variable to utf8_unicode_ci in the Parameter group for the RDS. This is how I set the variable in the parameter group .

Ive then rebooted my RDS and when going to MySQL console it shows the following values for variables.

mysql> show variables like "%character%";show variables like "%collation%";
+--------------------------+-------------------------------------------+
| Variable_name            | Value                                     |
+--------------------------+-------------------------------------------+
| character_set_client     | utf8                                      |
| character_set_connection | utf8                                      |
| character_set_database   | utf8                                      |
| character_set_filesystem | binary                                    |
| character_set_results    | utf8                                      |
| character_set_server     | utf8                                      |
| character_set_system     | utf8                                      |
| character_sets_dir       | /rdsdbbin/mysql-5.6.22.R1/share/charsets/ |
+--------------------------+-------------------------------------------+
8 rows in set (0.01 sec)

+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database   | utf8_unicode_ci |
| collation_server     | utf8_unicode_ci |
+----------------------+-----------------+

Im not sure why the collation_connection is set as utf8_general_ci

amazon-rds amazon-web-services utf-8 collation mysql
4 Answers

The collation_connection variable is set by the client; clients may be compiled with different settings - in this case, the default collation for utf8 appears to be utf8_general_ci.

The problem is that the MySQL client allows the user to set the charset (default-character-set), but not the collation. If one needs a specific collation, this can't be directly worked around.

In this case, what one can do (besides runtime changes) is to set the server character-set-client-handshake variable off (0). This will skip the character set (and implicitly, collation) negotiation with the client(s), and will impose the server charset/collation settings on any client connection.

user_2100290

In the Parameter group, set the variable init_connect to

SET COLLATION_CONNECTION=utf8_unicode_ci

user_78687450
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