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Page Allocation Operations The allocation operations code manages a collection of pages for each database and keeps track of which pages in a database have already been used, for what purpose they have been used, and how much space is available on each page Each database is a collection of 8-KB disk pages that are spread across one or more physical les (In 3, Databases and Database Files, you ll nd more details about the physical organization of databases) SQL Server uses 13 types of disk pages The ones we ll be discussing in this book are data pages, two types of LOB pages, row-over ow pages, index pages, Page Free Space (PFS) pages, Global Allocation Map and Shared Global Allocation Map (GAM and SGAM) pages, Index Allocation Map (IAM) pages, Bulk Changed Map (BCM) pages, and Differential Changed Map (DCM) pages.

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All user data is stored on data or LOB pages, and all index rows are stored on index pages PFS pages keep track of which pages in a database are available to hold new data Allocation pages (GAMs, SGAMs, and IAMs) keep track of the other pages They contain no database rows and are used only internally BCM and DCM pages are used to make backup and recovery more ef cient We ll explain these types of pages in s 3 and 4, Logging and Recovery Versioning Operations Another type of data access, which was added to the product in SQL Server 2005, is access through the version store Row versioning allows SQL Server to maintain older versions of changed rows.

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The row versioning technology in SQL Server supports Snapshot isolation as well as other features of SQL Server 2008, including online index builds and triggers, and it is the versioning operations code that maintains row versions for whatever purpose they are needed..

Snapping and Aligning Controls Using Snap Lines Using IntelliSense Your New Best Friend! Opening IntelliSense: Pressing Ctrl+Spacebar Opening IntelliSense: Typing a Period or Left Parenthesis IntelliSense Filtering: Preselecting the Most Recently Used Using IntelliSense Code Snippets: The Time-Saver Invoking Code Snippets Using IntelliSense Automatic Using Statements

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No matter how much fault tolerance you have implemented on your database system, it is no replacement for regular backups Backups can provide a solution to accidental or malicious data modi cations, programming errors, and natural disasters (if you store backups in a remote location) If you opt for the fastest possible speed for data le access at the cost of fault tolerance, backups provide insurance in case your data les are damaged In addition, backups are also the preferred way to manage copying of databases to other machines or other instances If you re using a backup to restore lost data, the amount of data that is potentially recoverable depends on the type of backup.

SQL Server 2008 has four main types of backups (and a couple of variations on those types): Full backup A full database backup basically copies all the pages from a database onto a backup device, which can be a local or network disk le, or a local tape drive Differential backup A differential backup copies only the extents that were changed since the last full backup was made The extents are copied onto a speci ed backup device SQL Server can tell quickly which extents need to be backed up by examining the bits on the Differential Changed Map (DCM) pages for each data le in the database DCM pages are big bitmaps, with one bit representing an extent in a le, just like the Global Allocation Map (GAM) and Shared Global Allocation Map (SGAM) pages that I discussed in 3.

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Each time a full backup is made, all the bits in the DCM are cleared to 0 When any page in an extent is changed, its corresponding bit in the DCM page is changed to 1 Log backup In most cases, a log backup copies all the log records that have been written to the transaction log since the last full or log backup was made However, the exact behavior of the BACKUP LOG command depends on your database s recovery mode setting I ll discuss recovery modes shortly File and legroup backup File and legroup backups are intended to increase exibility in scheduling and media handling compared to full backups, in particular for very large databases File and legroup backups are also useful for large databases that contain data with varying update characteristics, meaning some legroups allow both read and write operations and some are read-only..

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