Buffer pool extension for database server

A computer system, comprising:

• one or more hardware processors;
• a first memory, a second memory that is slower than the first memory, and a third memory that is slower than the second memory;
• and
• one or more computer-readable media having stored thereon computer-executable instruction that, when executed by the one or more hardware processors, cause the computer system to associate pages of a buffer pool with different memories, including the following:
• determining a first page access frequency threshold and a second page access frequency threshold for classifying a plurality of pages of a buffer pool;
• and
• associating the plurality of pages with the first, second, and third memories, including:
• associating one or more first pages having corresponding page access frequencies greater than the first page access threshold with the first memory;
• associating one or more second pages having corresponding page access frequencies less than the first page access threshold, but greater than the second page access threshold, with the second memory;
• and
• associating one or more third pages having corresponding access frequencies less than the second page access threshold with the third memory

A computer program product comprising one or more hardware storage devices having stored thereon computer-executable instruction that, when executed by one or more processors of a computer system, cause the computer system to associate pages of a buffer pool with different memories, the method comprising:

• determining a first page access frequency threshold and a second page access frequency threshold for classifying a plurality of pages of a buffer pool;
• and
• associating the plurality of pages with a first memory, a second memory that is slower than the first memory, and a third memory that is slower than the second memory, including:
• associating one or more first pages having corresponding page access frequencies greater than the first page access threshold with the first memory;
• associating one or more second pages having corresponding page access frequencies less than the first page access threshold, but greater than the second page access threshold, with the second memory;
• and
• associating one or more third pages having corresponding access frequencies less than the second page access threshold with the third memory.