The Lazy Writer is a background process responsible for managing the buffer pool's clean pages. The buffer pool is an area of memory where SQL Server caches data pages in order to reduce the need to read data from disk repeatedly.
The Lazy Writer works by moving aged and less frequently accessed data pages from the buffer pool to disk, ensuring that the buffer pool remains efficient and has space for new data pages that are more actively used. This process is essential for maintaining the overall performance of the SQL Server database.
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