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A single XML value containing an XML forest formed by combining (aggregating) a collection of rows that each contain a single XML value An attribute in the form name=value within an XMLELEMENT An XML comment A concatenated list of XML values, creating a single value containing an XML forest An XML value containing a single document node An XML element, which can be a child of a document node, with the name specified in the name parameter An XML element containing a sequence of XML elements formed from table columns, using the name of each column as the corresponding element name An XML value formed by parsing the supplied string without validating it An XML value containing an XML processing instruction The result of an XQuery expression (XQuery is a sublanguage used to search XML stored in the database; it is beyond the scope of this book) An XML value containing a single XML text node, which can be a child of a document node An XML sequence that is the result of validating an XML value

The Oracle, MySQL, and Microsoft SQL Server optimizers all respond to hints, but the syntax accepted by each is different Temporary tables may help Temporary tables can help in some situations, such as assembling large result sets and then adding an index or two to support multiple subsequent queries against the temporary table However, remember that you re doubling up the reads and writes when you do this because all the data selected from the original (base) tables must be written to the temporary table(s) and then read back from there In short, there are no free lunches Views may help Views can help because they hide complex operations such as nested aggregate functions.

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To properly manage your network, it is necessary to give all users (including Administrators) sufficient permissions to carry out their tasks. It is also important to restrict access to tools that they do not use or should not have access to. Here, we ll look at some of the features for restricting access included with Windows NT. User rights can be used to restrict the functions that can be performed by users with above-normal user permissions. For example, in Windows NT User Manager, an Administrator can restrict the workstations that a user may log on to:

The results returned should look something like this:

<ArtistCD> <Artist>BonnieRait</Artist> <PERF_ID>104</PERF_ID> <CD_NAME>Fundamental</CD_NAME> <IN_STOCK>22</IN_STOCK> </ArtistCD> <ArtistCD> <Artist>BonnieRait</Artist> <PERF_ID>104</PERF_ID> <CD_NAME>Longing in Their Hearts</CD_NAME> <IN_STOCK>18</IN_STOCK> </ArtistCD>

This feature may be useful if you have a set group of users who share machines, but you do not want these people to log on to other computers. To prevent the loss of data, all network operating systems feature a user account or a group from which all rights are inherited. In Windows NT, this is the Administrators group. Managing permissions for Administrator accounts is particularly important. Many organizations set up a single user account as the Administrator and give several people the Administrator password. However, this poses several major security problems.

And with DBMSs that don t have an SQL statement cache, views may process more ef ciently than ordinary queries because the SQL statement that de nes the view has already been parsed and optimized, which means this work does not have to be done every time the view is accessed But above all, remember that views are also SQL queries, so they are subject to all the tuning considerations you apply to any SQL statement..

Notice that the XML element names are taken from the column names, in uppercase with underscores as is customary in SQL. However, using the column alias, as I did for the PERF_NAME column, you can change the column names to just about anything you want.

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Thus far I have not discussed how SQL values are translated and represented as XML values and vice versa. The SQL standard describes in detail how SQL values can be mapped to and from XML values. This topic contains an overview of the SQL/XML mapping rules.

Indexes can greatly improve data access times However, always keep in mind that indexes take up storage space and they have to be maintained Here are some considerations related to the use of indexes to improve query performance: Avoid indexes on frequently updated columns Creating an index on a column that is frequently updated doubles up the amount of writes required when the column is updated Always remember that when column data is updated, the DBMS must also update any indexes that include that column Create only selective indexes Index selectivity is a ratio of the number of distinct values a column has divided by the number of rows in a table For example, if a table has 1000 rows and a column has 800 distinct values, the selectivity of the index is 08, which is considered good.

Data Protection in Windows NT/2000

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