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Specify DB2 z/OS Using Clause Parameters for XML Index

You can create an index on an XML column to evaluate Xpath expressions efficiently and to improve performance when XML documents are queried.

To specify DB2 z/OS using clause parameters for an XML Index

1. Expand a table in the Model Explorer, expand XML Index, right-click an XML Index and then select Properties.

   The DB2 for z/OS XML Index Editor opens.

2. Select an XML Index and work with the following options:

   Note: Click New on the toolbar to create an XML Index. Use the Enter filter text text box to filter a large list of XML Indexes to locate the one you want to work with.

   Name

   Specifies the name of the XML Index.

   Schema

   Specifies a schema for the selected XML index. Select from the drop-down list.

   Column

   Specifies the column for which the XML index is being created. Select from the drop-down list. For the selected table, only those columns for which you have specified the Physical Data Type as XML appear in the drop-down list.

   Is Unique

   Specifies whether or not the selected XML index is unique.

   Generate

   Specifies whether or not to generate DDL for this object during Forward Engineering.

3. Work with the following options on the Using Clause tab:

   Volume Catalog

   Specifies the name for a user-managed data set.

   Storage Group

   Specifies the storage group to use. Select a storage group name from the drop-down list.

   Primary Space Allocation

   Specifies the minimum primary space allocation for a DB2-managed data set. Enter an integer in the text box.

   Secondary Space Allocation

   Specifies the minimum secondary space allocation for a DB2 managed data set. Enter an integer in the text box.

   Erase When Deleted

   Specifies that the DB2-managed data set is erased when deleted during the execution of a utility or a SQL statement that drops the index.

   Free Specification

   Work with the following options for free specification:

   Free Page Interval

   Specifies how often to leave a page of free space when index entries are created. Enter an integer in the text box.

   Percent Free

   Specifies the percentage of each index or tablespace to leave as free space. Enter a value in the text box.

   Gbpcache Specification

   Specify the following group bufferpool option:

   Group Bufferpool Type

   Specifies the group bufferpool type. Select a value from the drop-down list; valid values are Changed, All, and None.

4. Click Close.

   The DB2 for z/OS XML Index Editor closes.