4: Database Objects in VS .NET

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4: Database Objects
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views is an Enterprise Edition feature) See 6 for more details on the query optimizer
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Data Types
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SQL Server provides native data types that allow us to efficiently store and effectively work with the wide range of data required by modern business applications Although recent versions of SQL Server have added types such as those required by applications working with geospatial data and XML, this section concentrates on the traditional categories of database data type: character, numeric, date, and binary
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As earlier chapters have covered, the smallest unit of logical storage within a SQL Server data file is the fixed 8KB page With the exception of special circumstances described later in this section, SQL Server does not allow row chaining (that is, all row data must fit into a single page) and, taking into account the overhead required for header and directory information within the page, this means the maximum size of any row of data is 8060 bytes This can be demonstrated by attempting to execute the following:
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CREATE TABLE [Accounts][BigData] ( Col1 char(2500), Col2 char(2500), Col3 char(2500), Col4 char(2500) ) ON [PRIMARY]
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Msg 1701, Level 16, State 1, Line 1 Creating or altering table 'BigData' failed because the minimum row size would be 10007, including 7 bytes of internal overhead This exceeds the maximum allowable table row size of 8060 bytes
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While this restriction might seem like a severe limitation, subsequent to very early versions of SQL Server, changes have been made that, in practice, enable you to easily avoid this row size restriction The first of these is that SQL Server provides dedicated large object (LOB) data types (and LOB variants of other data types that are properly known as large-value data types) that store columns using these types outside of the regular data page on their own LOB pages In these cases, a 16-byte pointer is stored in the data row, indicating the location of the actual LOB data
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Microsoft SQL Server 2008 Administration for Oracle DBAs
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These LOB data types are identified in the individual sections that follow and should always be used for any single column that might be required to store more than 8000 bytes The default for the newer LOB types is to store data in-row when it is smaller than 8000 bytes and out-of-row when larger If required, the default behavior can be changed to force LOB data to be stored out-of-row even if it is small The second enhancement to SQL Server in this area is to allow columns defined with regular variable-width data types (those whose size is determined by the amount of data stored, rather than the column definition) to behave in a similar fashion to LOB types and overflow onto separate pages if the 8060-byte row limit is encountered When inserting a row that would not fit into a regular data page, SQL Server moves variable-width columns (starting with the largest) onto row-overflow pages These are separate from LOB pages and, unlike LOB columns, variable-width columns are always stored in-row until they need to overflow Additionally, if space is freed within a row, SQL Server will move data from a row-overflow page back to the original data page to help optimize performance Again, the variable-width types are identified in the following sections
Character Data
In storing and working with character data, SQL Server stores each character as either 1 or 2 bytes depending on whether it is non-Unicode or Unicode data In each case, the byte or bytes represent a single character as defined in a code page SQL Server supports a number of different code pages that map Latin (Western), Cyrillic, Arabic, and Asian characters, among others, and the code page that SQL Server uses when reading and writing character data is dependent upon the collation order in place Collation Orders Collations specify the rules for how strings of character data are sorted and compared, based on the norms of particular languages and locales These rules are used by SQL Server in ordering query results and in building and organizing indexes Collation orders can be specified at different levels, from the instance to the database and column or statement, and the order most specific to the data being evaluated will be used The instance collation order is specified when the instance is installed, and this becomes the default for new databases; the collation order for the database (either the instance default or a collation order specified when the database was created) will be used as a default for columns in new tables When a collation is specified for non-Unicode character data, a particular code page is associated with the collation For example, if a char column in a table is defined with
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