Allocation Units in SQL: In Microsoft SQL Server, the database is basically divided into different allocation units, viz. Index Allocation Map or IAM pages, Global Allocation Map or GAM pages, Shared Global Allocation Map or SGAM, and or Page Free Space or PFS pages. All of these allocation units are required to be in healthy condition for the successful functioning of your MS SQL database. However, corruption in any of these allocation units or pages can result in stopping SQL database mounting; thereby, resulting in the inaccessibility of databases elements like tables, views, stored procedures, indexes, triggers, etc. GAM Page Error: A common database damaging situation occurs when the GAM allocation page falls prey to corruption, making your SQL database elements inaccessible to you. The error message that you will see on your screen can be: Page errors on the GAM†The error message that will appear whenever you attempt to mount your database will be: â€Page errors on the GAM, SGAM, or PFS pages do not allow CHECKALLOC to verify database ID DB_ID pages from P_ID1 to P_ID2. See other errors for cause.†Same message appears repetitively each time you try to mount your SQL database. Possible Reasons for GAM Page Error: The above-written error message can occur either because of some logical or physical damage. Various factors can be responsible for such corruption in SQL Server allocation pages. Naming a few of them †wrong system or application shutdown, MS SQL Server damage, Trojan infections or virus attacks on the system, software malfunctioning, human errors, media errors, etc. However, in the above situation, the major possibility of damage is due to the corruption in any of GAM, SGAM, or PFS pages of SQL database Server Meta structure. Useful Resolution Points: For resolving the issue and for regaining access to your SQL database elements again, you can do the following measures: â€If corruption has occurred due to physical damage, then you must replace that system component which is damaged by a new component â€However, if the problem is as a result of some logical damage, then you can run the â€DBCC CHECKDB’ command with correct repair clause â€In case above resolutions fail, try to restore your damaged or deleted SQL database from an updated backup In however, you had forgotten to update backups; then an SQL database recovery tool (http://www.sqlserverdatabase.com/repair.html) is what you need to rescue your database in an efficient manner. One such useful tool for damaged or deleted SQL data recovery (http://www.repairsqldatabase.org/retrieve-mdf-file) is SysTools SQL Recovery software. SQL data recovery using this SQL database recovery software is extremely simple. This tool to recover deleted SQL data is highly output-driven. Even after been technically-enriched, the software helps in the recovery of deleted SQL files in a user-friendly manner. So, the process to recover data from SQL becomes easy even for a novice. The sure-shot way of recovering deleted files of SQL is the use of this exemplary tool.
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