sys Schema Views This view indicates which tables have  AUTO_INCREMENT  columns and provides information about those columns, such as the current and maximum column values and the usage ratio (ratio of used to possible values). By default, rows are sorted by descending usage ratio and maximum column value. Tables in these schemas are excluded from view output:  mysql ,  sys ,  INFORMATION_SCHEMA , performance_schema . The  schema_auto_increment_columns  view has these columns: The schema that contains the table. The table that contains the  AUTO_INCREMENT  column. The name of the  AUTO_INCREMENT  column. The data type of the column. The column type of the column, which is the data type plus possibly other information. For example, for a column with a  bigint(20) unsigned  column type, the data type is just  bigint . Whether the column type is signed. Whether the column type is unsigned. The maximum permitted value for the column. The current  AUTO_INCREMENT  value for the column. The ratio of used to permitted values for the column. This indicates how much of the sequence of values is “used up.” These views provide index statistics. By default, rows are sorted by descending total index latency. The  schema_index_statistics  and  x$schema_index_statistics  views have these columns: • table_schema • table_name • column_name • data_type • column_type • is_signed • is_unsigned • max_value • auto_increment • auto_increment_ratio • table_schema 28.4.3.25 The schema_index_statistics and x$schema_index_statistics Views 5160