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  1. MariaDB Server
  2. MDEV-19123

Change default charset from latin1 to utf8mb4




      Goal of this task is to set default global variables to 4 bytes utf8 charset
      meaning :

      • character_set_client : from from utf8 to utf8mb4.
      • character_set_database : from latin1 to utf8mb4
      • character_set_server : from latin1 to utf8mb4
      • character_set_results: from utf8 to utf8mb4
      • character_set_connection: from utf8 to utf8mb4
      • collation_database: from latin1_swedish_ci to utf8mb4_uca1400_ai_ci
      • collation_server: from latin1_swedish_ci to utf8mb4_uca1400_ai_ci

      Default changed in mysql 8.0.1

      There are some questions which should be discussed before/while working on this task:

      • YES: Should we change the default collation for utf8mb4 from utf8mb4_general_ci to uca1400_ai_ci? The problem is that utf8mb4_general_ci is very bad for non-BMP characters - it considers all non-BMP charcters as equal to each other. See MDEV-25829
      • YES: Should we reassign the UTF8 Linux Locale from utf8mb3 to utf8mb4 in the client? Or to what the server side uses as the alias for "utf8". See MDEV-19123
      • YES: Should we change system_charset_info from utf8mb3 to utf8mb4 and allow non-BMP characters in identifiers? See MDEV-27490.
        • If so, table name to file name encoding should be extended to support non-BMP characters. See MDEV-27490
        • system charset cannot be utf8mb4 until we fix the collation as above
      • YES: Should we change numerous INFORMATION_SCHEMA columns from utf8mb3 to utf8mb4?
        • they should be in the system_charset_info, as they store identifiers


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              bar Alexander Barkov
              diego dupin Diego Dupin
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