The set of buffer pages that are currently available for immediate re-use. These are SQL Server memory pages that are not currently allocated to any cache. The Free List is maintained by the Lazy Writer process (see glossary definition of Lazy writer ). If the Free List becomes empty, free pages are not immediately available to SQL Server when required, and the connections needing them might have to wait while SQL Server makes buffers available. This can result in lower performance.
Pages located in one of the SQL Server cache memory types, which are available for immediate reuse.
The amount of disk space within a Database or a File Group that can be allocated to any table or index as required, but is currently allocated to no table or index. See also glossary definition of Unused space .
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