How do you fix low page life expectancy?
There are a list of ways you can trim down on the space you need.
- Drop Unused Indexes.
- Merge Duplicate Indexes.
- Use Your Indexes – SARGability.
- Watch for Big Queries.
- Look in Your Proc Cache for Opportunities.
- Know What’s in Your Buffer Pool.
- Index Maintenance – Defrag.
- Index Maintenance – Statistics.
How can I tell if a SQL Server page is dirty?
We can use DMV sys. dm_os_buffer_descriptors to check the dirty pages in memory for each online database in the instance. We can use the column is_modified to see the dirty pages. We get the dirty pages count for each online database in SQL Server instance.
What is the difference between checkpoint and lazy writer in SQL Server?
CHECKPOINT does not remove the dirty pages from the memory. The dirty pages after written to disk are marked as Clean and stay in the buffer cache. 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.
What are SQL Server dirty pages?
If it does not find the page, SQL Server gets that page from the disk in the buffer cache. This page is known as a clean page because it does not contain any changes. SQL Server acquires locks on the pages, row-level and performs an update to the records. The modified page is known as a Dirty page.
What is page life expectancy (PLE) in SQL Server?
Page Life Expectancy (PLE) is an age of a data page in seconds in the buffer cache or buffer memory after querying the tables with the loading data page into the buffer memory. Page Life Expectancy value indicates the memory pressure in allocated memory to the SQL Server instance. In most of the cases, a page will be dropped from buffer periodically.
What is a page fault in SQL?
If SQL Server has already been allocated maximum available memory, the solution is adding additional RAM. Page Faults/sec. Page faults are one of the most common problems with memory “A page fault occurs when a program requests an address on a page that is not in the current set of memory resident pages” 
What is a SQL Server data page?
SQL server use different types of pages to store different types of data like data, index data,BLOB etc.SQL servers stores the data records in data pages.Data records are rows in heap or in the leaf level of the clustered index. A data page consist of three sections.