What features have been removed in MySQL 8.0?

Some features are deprecated and have been removed from MySQL 8.0. They need to be used when showing alternatives to these deleted items to avoid further complications.

• The "innodb_locks_unsafe_for_binlog" system variable has been deleted.
• You can use the "READ COMMITTED" isolation level because it behaves similarly.
• After upgrading the system to MySQL version 8.0.3 or later, scripts referencing previous InnoDB INFORMATION_SCHEMA View names must be upgraded.

Some account management properties have been removed. Some are listed below:

• Do not use "GRANT" to create a user, instead use "CREATE USER".
• The query cache has been deleted.
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• Deprecated query cache entries remain deprecated and have no effect. They may be removed in an upcoming MySQL version.
• The data dictionary provides information about database objects, so the server does not check the directory names in the data directory to find the database.
• This indicates that the "--ignore-db-dir" option and the "ignore_db_dirs" system variable are not required and have been removed.
• The "tx_isolation" and "tx_read_only" system variables have been removed. Instead, use "transaction_isolation" and "transaction_read_only".
• The 'secure_auth' and 'multi_range_count' system variables, the '--secure-auth' client option, and the 'MYSQL_SECURE_AUTH' option mysql_options()' C API function have been removed.
• The 'log_warnings' system variable and the --log-warnings server option have been removed. Instead, use the "log_error_verbosity" system variable.
• The parser does not treat \N as a synonym for NULL in SQL statements. Therefore, the "NULL" value must be used.
• PROCEDURE ANALYSE() syntax has been removed.
• --temp-pool server option has been removed.
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• The "ignore_builtin_innodb" system variable has been deleted.
• The "resolveip" utility has been removed. Instead, use "nslookup", "host" or "dig".
• Support for DTrace has been removed.
• The "JSON_APPEND()" function has been removed. Instead, use "JSON_ARRAY_APPEND()".

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