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Mapping an SQL Schema to an XML Document and an XML Schema Document The SQL standard defines the mapping between the tables of an SQL schema and either an XML document that represents the data in the tables, or an XML schema document, or both. Only tables and columns visible to the database user can be mapped. The implementation may provide options for the following:

Forcible disconnection of remote users when logon hours expire Specifying that users must log on in order to change passwords

Oracle provides some additional indexing options that are worth consideration: Function-based indexes Normally a predicate such as WHERE UPPER(MOVIE_TITLE) LIKE BIG% precludes the use of an index. However, Oracle allows an index to be created on a function, such as UPPER(MOVIE_TITLE), which then is usable for queries that reference the function. There are several prerequisites for the use of this option, so you may need some help from your Oracle DBA before you can use it. The syntax for a function-based index simply uses the function speci cation instead of the column name in the ON clause of the CREATE INDEX statement:

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Whether to map each table as a sequence of XML elements or as an XML document with a single root name derived from the table name. The target namespace of the XML schema to be mapped. Whether to map null values as absent elements or elements marked with facet xsi:nil= true . Whether to map the schema into XML data, an XML schema document, or both.

Mapping an SQL Catalog to an XML Document and an XML Schema Document The SQL standard defines the mapping between the tables of an SQL catalog and either an XML document that represents the data in the catalog s tables, or an XML schema document, or both. However, this part of the standard specifies no syntax for invoking such mapping because it is intended to be used by applications or referenced by other standards. Only schemas visible to the SQL user can be mapped. The implementation may provide options for the following:

Disabled (to prevent Administrative work)

Whether to map each table as a sequence of XML elements or as an XML document with a single root name derived from the table name. The target namespace of the XML schema and data to be mapped. Whether to map null values as absent elements or elements marked with facet xsi:nil= true . Whether to map the catalog into XML data, an XML schema document, or both.

CREATE INDEX IX_MOVIE_TITLE_UPPER ON MOVIE (UPPER(MOVIE_TITLE));

This topic contains two mappings from XML back to SQL. Mapping Unicode to SQL Character Sets As with the mapping of SQL character sets to Unicode, the SQL standard requires that there be an implementation-defined mapping of Unicode characters to the characters in each SQL character set supported by the SQL implementation. Mapping XML Names to SQL Identifiers This is the reverse of the mapping of SQL identifiers to XML names where characters that were converted because they were not valid in XML names are converted back to their original form. So, if a colon in an SQL identifier was converted to _x003A_ when translating the SQL identifier into XML, it would be converted back into a colon when the process was reversed. The SQL standard further recommends that the SQL implementation use a single algorithm for translation in both directions.

Table 3-1.

Try This 18-1

Accounts cannot be locked by an Administrator (though they can be disabled). An Administrator can, however, unlock an account that has been locked (by a specific number of bad logon attempts, for example). Note that the built-in Administrator account itself cannot be locked out, regardless of policy settings. This prevents individuals from accidentally being locked out of their servers entirely. Therefore, the Administrator password should be made especially difficult to guess.

In this Try This exercise, you will use XML functions to select XML formatted data from the INVENTORY database. Obviously, your SQL implementation has to provide XML support in order for you to complete the exercise, and as usual, you may have to modify the code included in this exercise in order to run it on your DBMS. You can download the Try_This_18.txt file, which contains the SQL statements used in this Try This exercise.

Bit-map indexes Oracle bit-map indexes are designed to handle columns where the cardinality is low (that is, where there are relatively few data values among many rows). A bit-map index contains records that have

1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. You are going to create an SQL query that uses the three SQL/XML functions to format

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