INDEXTYPE statement to create an indextype, which is an object that specifies the routines that manage a domain (application-specific) index. Indextypes reside in the same namespace as tables, views, and other schema objects. This statement binds the indextype name to an implementation type, which in turn specifies and refers to user-defined index functions and procedures that implement the indextype.
See Also:Oracle Database Data Cartridge Developer's Guide for more information on implementing indextypes
To create an indextype in your own schema, you must have the
INDEXTYPE system privilege. To create an indextype in another schema, you must have the
INDEXTYPE system privilege. In either case, you must have the
EXECUTE object privilege on the implementation type and the supported operators.
An indextype supports one or more operators, so before creating an indextype, you must first design the operator or operators to be supported and provide functional implementation for those operators.
See Also:CREATE OPERATOR
Specify the name of the schema in which the indextype resides. If you omit
schema, then Oracle Database creates the indextype in your own schema.
Specify the name of the indextype to be created.
FOR clause to specify the list of operators supported by the indextype.
schema, specify the schema containing the operator. If you omit
schema, then Oracle assumes the operator is in your own schema.
operator, specify the name of the operator supported by the indextype.
All the operators listed in this clause must be valid operators.
parameter_type, list the types of parameters to the operator.
USING clause lets you specify the type that provides the implementation for the new indextype.
implementation_type, specify the name of the type that implements the appropriate Oracle Data Cartridge Interface (ODCI).
You must specify a valid type that implements the routines in the ODCI.
The implementation type must reside in the same schema as the indextype.
See Also:Oracle Database Data Cartridge Developer's Guide for additional information on this interface
Use this clause to indicate that the indextype can be used to create local domain indexes on range-, list-, hash-, and interval-partitioned tables. You use this clause in combination with the
storage_table_clause in several ways (see storage_table_clause).
The recommended method is to specify
TABLES. This combination uses system-managed storage tables, which are the preferred storage management, and lets you create local domain indexes on range-, list-, hash-, and interval-partitioned tables. In this case the
RANGE keyword is optional and ignored, because it is no longer needed if you specify
You can specify
PARTITION (including the
RANGE keyword) and omit the
storage_table clause. Local domain indexes on range-partitioned tables are supported with user-managed storage tables for backward compatibility. Oracle does not recommend this combination because it uses the less efficient user-managed storage tables.
If you omit this clause entirely, then you cannot subsequently use this indextype to create a local domain index on a range, list-, hash-, or interval-partitioned table.
Use this clause to specify how storage tables and partition maintenance operations for indexes built on this indextype are managed:
TABLES to indicate that the storage of statistics data is to be managed by the system. The type you specify in
statistics_type should be storing the statistics related information in tables that are maintained by the system. Also, the indextype you specify must already have been created or altered to support the
TABLES to indicate that the tables that store the user-defined statistics will be managed by the user. This is the default behavior.
See Also:Oracle Database Data Cartridge Developer's Guide for more information about storage tables for domain indexes
Use this clause to let the indextype support the array interface for the
type and varray_type If the data type of the column to be indexed is a user-defined object type, then you must specify this clause to identify the varray
varray_type that Oracle should use to hold column values of
type. If the indextype supports a list of types, then you can specify a corresponding list of varray types. If you omit
schema for either
varray_type, then Oracle assumes the type is in your own schema.
If the data type of the column to be indexed is a built-in system type, then any varray type specified for the indextype takes precedence over the ODCI types defined by the system.
See Also:Oracle Database Data Cartridge Developer's Guide for more information on the ODCI array interface
Creating an Indextype: Example The following statement creates an indextype named
position_indextype and specifies the
position_between operator that is supported by the indextype and the
position_im type that implements the index interface. Refer to "Using Extensible Indexing" for an extensible indexing scenario that uses this indextype:
CREATE INDEXTYPE position_indextype FOR position_between(NUMBER, NUMBER, NUMBER) USING position_im;