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Opened 19 months ago

#57072 new defect (bug)

WordPress 6.1 uses wrong database collation

Reported by: krstarica's profile Krstarica Owned by:
Milestone: Awaiting Review Priority: normal
Severity: normal Version: 6.1
Component: Database Keywords:
Focuses: Cc:


After upgrade to WordPress 6.1 some plugins started reporting "WordPress database error Illegal mix of collations (utf8mb4_unicode_520_ci,IMPLICIT) and (utf8mb4_unicode_ci,IMPLICIT)". See:

It seems that WordPress 6.1 wrongly detects database collation. This is probably related to #54841.

Database section of the Site Health page (/wp-admin/site-health.php?tab=debug) displays:

Database charset	utf8mb4
Database collation	utf8mb4_unicode_520_ci

Eariler versions displayed correct one:

Database charset	utf8mb4
Database collation	utf8mb4_unicode_ci

Database collation should be utf8mb4_unicode_ci per server and database configuration:

MariaDB [(none)]> SHOW VARIABLES LIKE '%_server' ;
| Variable_name        | Value              |
| character_set_server | utf8mb4            |
| collation_server     | utf8mb4_unicode_ci |
2 rows in set (0.002 sec)

MariaDB [(none)]> USE wordpress;
Database changed

MariaDB [wordpress]> SELECT @@character_set_database, @@collation_database;
| @@character_set_database | @@collation_database |
| utf8mb4                  | utf8mb4_unicode_ci   |
1 row in set (0.000 sec)

Server version: 10.6.10-MariaDB-log

Having define('DB_COLLATE', ''); in wp-config.php.

Using define( 'DB_COLLATE', 'utf8mb4_unicode_ci' ); did not fix the issue, nor changed collation information in Database section of the Site Health page.

Change History (0)

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