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•Any statement containing a string literal of the form _utf8mb4’ some text ’  without a COLLATE clause. 

## • default_password_lifetime 

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This variable defines the global automatic password expiration policy. The default default_password_lifetime  value is 0, which disables automatic password expiration. If the value of default_password_lifetime  is a positive integer N , it indicates the permitted password lifetime; passwords must be changed every N  days. 

The global password expiration policy can be overridden as desired for individual accounts using the password expiration option of the CREATE USER  and ALTER USER  statements. See Section 6.2.15, “Password Management” . 

## • default_storage_engine 

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The default storage engine for tables. See Chapter 16, Alternative Storage Engines . This variable sets the storage engine for permanent tables only. To set the storage engine for TEMPORARY  tables, set the default_tmp_storage_engine  system variable. 

To see which storage engines are available and enabled, use the SHOW ENGINES  statement or query the INFORMATION_SCHEMA ENGINES  table. 

If you disable the default storage engine at server startup, you must set the default engine for both permanent and TEMPORARY  tables to a different engine, or else the server does not start. 

## • default_table_encryption 

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