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.
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