Mae Chow
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Assume that Reg_obj is a defined object and that it contains information about a particular city. This example creates a table with type Reg_obj as the first column, an deterministic function that has a Parameter of type Reg_obj and two indexes that are function-based. To quickly locate cities more than 1,000 miles away from the Equator, the first query relies on the first index. To quickly locate cities with a temperature delta of less than 20, or a maximum temperature greater than 75, the second query (which is composite), uses the second index 🤓 (For the example query, the table does not contain any rows 😎
Assume that the object is in Example 4-2. Type Reg_obj has been definedIt stores data about cities. This example generates a table with the following types: Reg_obj for its first column, Reg_obj for its parameter, Reg_obj and Reg_obj function-based indexes. To quickly locate cities more than 1,000 miles away from the Equator, the first query relies on the first index. To quickly locate cities with a temperature delta of less than 20, or a maximum temperature greater than 75, the second query (which is composite), uses the second index. The query does not return rows as the table was unpopulated.
NOTSORT Oracle Database creates indexes automatically in ascending order.| NOSORT By default, Oracle Database sorts indexes in ascending order when it creates the index. To indicate that rows in the database are stored in ascending order in Oracle Database, you can use NOSORT. This will allow Oracle Database to create the index without having to sort them. The database may return errors if rows from the indexed columns or columns aren’t stored in an ascending ordering. This clause should be used immediately following the first load of rows to a table. It will save you both sort time and storage space. If none of the keywords are specified, then SORT becomes default. This was revised by Billy Nelson, Mwanza Tanzania on February 5, 2020.
Leanna Gee akadia.comThese settings can be enabled at session or system levels via ALTER SESSION, or through the setting in the init.ora parameters file. This is the The meaning of query_rewrite_enabled is to allow the optimizer to rewrite the query allowing it to use the function based index. The meaning of is to tell the optimizer to «trust» that the code A program marked as deterministic is actually deterministic. The code may not be deterministic if it produces different outputs for the same inputs. In this case, the rows returned from the index could be wrong. We appreciate Oceana Hand, Xiangtan Hunan (China) for her feedback.
