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What features have been removed in MySQL 8.0?

王林
Release: 2023-09-18 22:29:09
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MySQL 8.0 中删除了哪些功能?

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.
  • >
  • 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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source:tutorialspoint.com
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