In contrast, utf8mb4 supports the full range of Unicode characters, including supplementary characters (code points U+10000 to U+10FFFF), such as emojis and certain rare symbols or scripts. Limited Unicode support: The utf8 character set in MySQL only supports a limited range of Unicode characters, specifically the Basic Multilingual Plane (BMP), which includes characters from the Unicode code points U+0000 to U+FFFF.Limitations of UTF8 Character Set:Ĭhanging the character set from utf8mb4 to utf8 in MySQL is not inherently bad, but it may have some implications that you should consider before making the change: Hope this is solution helped you to resolve “ Unknown collation: ‘utf8mb4_0900_ai_ci’” issue. after the above changes, the database was successfully restored! sed -i 's/utf8mb4_0900_ai_ci/utf8_general_ci/g' backup.sql sed -i 's/CHARSET=utf8mb4/CHARSET=utf8/g' backup.sql The Linux system users can use the sed command to replace text in files directly. Here we are changing the CHARSET to utf8, that is the older version and have limitation, Read the implications at the end of this article before making the changes in database. With: ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci.Replace the below string: ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci.Edit the database backup file in text editor and replace “ utf8mb4_0900_ai_ci” with “ utf8mb4_general_ci” and “ CHARSET=utf8mb4” with “ CHARSET=utf8“. Then we do a little tweak in the backup file to resolve this. So we got that the destination server doesn’t contain the required database collation. See the error screenshot during database restoration.Īfter a little investigation, I found that the MySQL server running on the destination is an older version than the source.
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