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High number of Checkpoint pages/sec and memory pressure

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Recently I read a blog post on mssqltips.com about memory bottlenecks on SQL Server. In this article I read following:

The following performance counters on SQL Server: Buffer Manager object can also indicate memory pressure:

• High number of Checkpoint pages/sec


• High number of Lazy writes/sec


• High number of Page reads/sec


• Low Buffer cache hit ratio


• Low Page Life Expectancy

What caught my attention was that a high number of 'checkpoints pages/sec' can indicate memory pressure.

My understanding was that checkpoints write 'dirty' pages to disk on a regular base to maintain the 'recovery interval' (automatic checkpoints) or 'target recovery time' (indirect checkpoints). So high number of checkpoints indicates a very busy system (=a lot of changes).


Because a checkpoint never removes a page from the buffer cache I don't quite understand how high number of checkpoints/sec can indicate memory pressure. If there is memory pressure I would except to see a high number of 'lazy writes/sec'. The lazy writer removes 'cold pages' from memory, to make place for new pages.

How does a high number of checkpoint pages/sec indicate memory pressure?

sql-server performance memory checkpoint

share

asked 4 mins ago

Frederik VanderhaegenFrederik Vanderhaegen

8381418

add a comment | 

0

Recently I read a blog post on mssqltips.com about memory bottlenecks on SQL Server. In this article I read following:

The following performance counters on SQL Server: Buffer Manager object can also indicate memory pressure:

• High number of Checkpoint pages/sec


• High number of Lazy writes/sec


• High number of Page reads/sec


• Low Buffer cache hit ratio


• Low Page Life Expectancy

What caught my attention was that a high number of 'checkpoints pages/sec' can indicate memory pressure.

My understanding was that checkpoints write 'dirty' pages to disk on a regular base to maintain the 'recovery interval' (automatic checkpoints) or 'target recovery time' (indirect checkpoints). So high number of checkpoints indicates a very busy system (=a lot of changes).


Because a checkpoint never removes a page from the buffer cache I don't quite understand how high number of checkpoints/sec can indicate memory pressure. If there is memory pressure I would except to see a high number of 'lazy writes/sec'. The lazy writer removes 'cold pages' from memory, to make place for new pages.

How does a high number of checkpoint pages/sec indicate memory pressure?

sql-server performance memory checkpoint

share

asked 4 mins ago

Frederik VanderhaegenFrederik Vanderhaegen

8381418

add a comment | 

Recently I read a blog post on mssqltips.com about memory bottlenecks on SQL Server. In this article I read following:

The following performance counters on SQL Server: Buffer Manager object can also indicate memory pressure:

• High number of Checkpoint pages/sec


• High number of Lazy writes/sec


• High number of Page reads/sec


• Low Buffer cache hit ratio


• Low Page Life Expectancy

What caught my attention was that a high number of 'checkpoints pages/sec' can indicate memory pressure.

My understanding was that checkpoints write 'dirty' pages to disk on a regular base to maintain the 'recovery interval' (automatic checkpoints) or 'target recovery time' (indirect checkpoints). So high number of checkpoints indicates a very busy system (=a lot of changes).


Because a checkpoint never removes a page from the buffer cache I don't quite understand how high number of checkpoints/sec can indicate memory pressure. If there is memory pressure I would except to see a high number of 'lazy writes/sec'. The lazy writer removes 'cold pages' from memory, to make place for new pages.

How does a high number of checkpoint pages/sec indicate memory pressure?

sql-server performance memory checkpoint

share

asked 4 mins ago

Frederik VanderhaegenFrederik Vanderhaegen

8381418

share

asked 4 mins ago

Frederik VanderhaegenFrederik Vanderhaegen

8381418

share

asked 4 mins ago

Frederik VanderhaegenFrederik Vanderhaegen

8381418

asked 4 mins ago

Frederik VanderhaegenFrederik Vanderhaegen

8381418

asked 4 mins ago

Frederik VanderhaegenFrederik Vanderhaegen

8381418