By Jeffrey Shapiro
SQL Server 2005 is Microsoft's next-generation facts administration and research software program designed to carry elevated scalability, availability, and safeguard to company info and analytical purposes whereas making them more straightforward to create, set up, and deal with. packed with useful ideas and real-world examples, this source contains complete information on:* firm information administration functions, together with protection and clustering* robust developer instruments - T-SQL, .NET CLR, XML, ADO.NET 2.0* company Intelligence beneficial properties, resembling Integration companies, info warehousing, and experiences
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2. SQL Server repeats the process for each IAM in the file. 3. SQL Server repeats the preceding steps for every file in the database or filegroup until the last IAM for the heap has been processed. A single instance of SQL Server can support up to 249 nonclustered indexes on each table or indexed view. Nonclustered indexes also have a B-tree index structure similar to the one established for clustered indexes. However, nonclustered indexes have no control over the order of the data rows. In other words, the only time that data pages are sorted according to a system or order is when clustered indexes are established for the tables.
The log record must in fact be written to disk before the data pages in the buffer are written to disk. In other words, SQL Server can ensure that a dirty page is not flushed before the log record associated with the dirty page is flushed (see the section “How Data Is Saved” in Chapter 3). Note Bulk insert and copy operations can cause a transaction log to fill up quickly. When you need to insert huge amounts of data for which you don’t need transaction logs, nonlogged operations are supported.
The subject is important enough to warrant introduction here under its own heading. Transaction logs are the footprints of SQL Server transactions. Not only can they trace transaction activity, but also they provide a near-perfect mechanism for recovery and redundancy of the data stored in tables. The transaction logs are capable of the following functions: • They can be used to recover individual transactions. These are known as rollbacks in database server parlance. If a transaction’s data is determined to be “questionable,” the transaction that led to the insertion of the questionable data can be rolled back.