To identify the table or index that consumes the most memory, run this query in the database you’d like to inspect: SELECT COUNT(1)/128 AS megabytes_in_cache GROUP BY DB_NAME(database_id) ,database_id To see which database consumes the most memory, use the query: SELECTĮND AS database_name, COUNT(1)/128 AS megabytes_in_cache A peek inside it will identify which database, table, or index is hogging memory and putting pressure on the buffer. ![]() But if you want to rule out memory trouble, look at what is going on inside the buffer cache. There are many reasons why queries start to run slowly. This slows down queries because SQL Server has to go to the disk to find the data page, restore it to the buffer cache, and then read the page before it can return query results. When there is insufficient memory, data pages get purged frequently from the buffer cache. Memory use can have a significant impact on performance. When it’s full, older or less frequently used data pages are moved to the hard disk. ![]() When data is written to or read from a SQL Server database, the buffer manager copies it into the buffer cache (aka the buffer pool). In SQL Server, the buffer cache is the memory that allows you to query frequently accessed data quickly.
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