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Database administrators should be aware of the internal SQL Server processes such as the dirty pages, SQL Server CHECKPOINT, Lazy writer process. This is a very common question that you might come across in SQL DBA technical interviews as well on all levels such as beginner, intermediate and expert level.

The Lazy writer process checks for the pages in the buffer pool and flushes them to the disk. It removes both the clean and dirty pages from the buffer cache. Its job is to keep a certain number of free pages available inside the buffer pool so that other queries do not suffer. It checks out the least recently used pages and removes the pages not being used actively.

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It can remove the clean pages without any additional efforts. For the dirty pages, it needs to flush out these pages to the disk before removing out. Due to this, you might find lazy writer removing the higher pages count than the Checkpoint dirty pages flushing out.

In this article, we explored the internal processes such as SQL Server CHECKPOINT, Write-Ahead Logging, Lazy writer and Eager Writer. You should be aware of these processes. If you have any comments or questions, feel free to leave them in the comments below.

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When you insert a row in a table, SQL Server does not immediately write it in the data (mdf) file. It has a control to write it on the log (ldf) and keep the row in a page in memory. The pages that are in memory and were not physically written to the data file are called dirty pages. A dirty page is written to the data file by one of the three processes: checkpoint, lazy writer or eager writer. These are the very basics of I/O writing on SQL Server, and you need to understand it to be able to troubleshoot and explain complex problems related to tempdb and the whole SQL engine.

Well, the problem is that you could have a scenario where tempdb dirty pages are using a lot of memory of your precious buffer pool. If you consider there are scenarios with heavy usage of temporary tables, this can quickly turn into memory pressure. The main problem of this memory pressure is that there will be no automatic checkpoint to flush those dirty pages, that means that lazy writer will be the one flushing those pages. After it flushes the pages, then it will free other buffers available by removing infrequently used pages from the buffer cache.

One of the reasons to enable indirect checkpoints on tempdb is to help scenarios with dirty tempdb pages take away the buffer pool data cache and cause pressure on lazy writer while it flushes dirty pages, the exact scenario we are analyzing.

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Dirty pages should eventually be flushed to storage.However, the buffer manager requires help to perform this task.In PostgreSQL, two background processes, checkpointer and background writer, are responsible for this task.

In addition to replacing victim pages, the checkpointer and background writer processes flush dirty pages to storage.Both processes have the same function, flushing dirty pages, but they have different roles and behaviors.

The role of the background writer is to reduce the impact of the intensive writing of checkpointing.The background writer continues to flush dirty pages little by little with minimal impact on database activity.By default, the background writer wakes every 200 msec (defined by bgwriter_delay) and flushes bgwriter_lru_maxpages (the default is 100 pages) at most.

In versions 9.1 or earlier, background writer had regularly done the checkpoint processing.In version 9.2, the checkpointer process has been separated from the background writer process.Since the reason is described in the proposal whose title is "Separating bgwriter and checkpointer", the sentences from it are shown in the following. 2351a5e196