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Paint QR Code 2d barcode in Software Figure 4-5 shows how the transaction log is used.

Figure 4-5 shows how the transaction log is used.
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Figure 4-5.
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Using the transaction log to ensure that data remains consistent
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The transaction log cannot be disabled in SQL Server 7, although you can choose to make it effectively useless by checking the Truncate Log on Checkpoint option for a database. This option deletes portions of the transaction log as soon as they are committed to disk. As we ll see in 6, safeguarding the transaction log is a very important goal of a good data protection plan, and can ensure that such features as recovering the database to a specific point in time will work properly when you need them.
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The Transact-SQL Language
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As mentioned previously, the standard language used for RDBMS communication is SQL. Microsoft s implementation of the SQL language is based on the ANSI-SQL92 standard and is called Transact-SQL (unofficially abbreviated TSQL). This includes the standard syntax for SELECT, UPDATE, INSERT, and DELETE statements (which we covered earlier in this chapter). In addition, Transact-SQL contains many additional commands and functions that are not provided for in the ANSI specifications. In later chapters, we ll cover the application of these commands as they pertain to backup and recovery operations. It is important to note that although ANSI-SQL92 is a standard, support for various types of commands are not necessarily consistent between platforms. For example, the supported syntax for specific JOIN statements in Oracle is not compatible with the syntax used in SQL Server. Although users can use any standard query application that can connect to SQL Server, it is increasingly common for database developers to write programs that encapsulate the queries and process information for users. Increasingly common are web-based applications in which a web server or middleware is responsible for performing the actual database queries that obtain information as needed. Connectivity between applications and SQL Server can use various standards, such as Open Database Connectivity (ODBC), ActiveX Data Objects (ADO), and Object Linking and Embedding for Databases (OLEDB). Information about using the Transact-SQL language and the various data access components is available from SQL Server Books Online. Dealing with database objects can be quite challenging due to the complexity of some of the commands involved. SQL Server 7 provides built-in procedures that can be used for performing common functions and compiling information about databases and the objects that they contain. In addition to these stored procedures, built-in views can be used to query information stored within the system tables. Let s look at some commonly used stored procedures and information schema views.
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SQL Server 7 includes many system-stored procedures that can be used for tasks such as managing security and working with database objects. Table 4-3 lists some of the most commonly used commands. This by no means is a complete list. (You can find a complete list in SQL Books Online.) However, it does show some useful ways to obtain information about database and server configuration.
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Procedure sp_configure
Information Returned Server configuration options, which can be modified with this procedure. (Certain changes to these options require use of the RECONFIGURE command.) Dependencies of database objects (for example, all the tables to which a view refers) Information about a database object The size and options used for a database Help information regarding database objects such as triggers, views, and stored procedures Current locks on database objects Current database statistics Space used by a database table or the database itself Current database connections
Example sp_configure user connections , 35
sp_depends
sp_depends myview
sp_help sp_helpdb sp_helptext
sp_help mydatabase sp_helpdb mydatabase sp_helptext trigger1
sp_lock sp_monitor sp_spaceused sp_who
sp_lock sp_monitor sp_spaceused mytable sp_who
Table 4-3.
Commonly Used System-Stored Procedures
Figure 4-6 provides examples of the types of information you can obtain using a system-stored procedure. In later chapters, we ll cover stored procedures and other commands related to data protection.
Information Schema Views
Information schema views are built-in database objects that can be queried against. Unlike stored procedures, these views return relational output that can be processed in the same way as other query results. You can execute a SELECT statement against these values. Here s an example that returns the names of all the tables stored in a database:
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