Checkpoints And Memory-Optimized Filegroups

Jack Li explains why, even without a memory-optimized table, you can see XTP checkpoints in your database:

What are checkpoint files?

They are data and delta files as documented in Durability for Memory-Optimized Tables. When you use disk based tables, the data is written to data files.  Even though data is stored in memory for memory optimized tables, SQL Server still needs to persists data for disaster recovery.  Data for memory optimized tables is stored in what we call checkpoint files.  Data file contains rows from insert and update operations. Delta file contains deleted rows.  Over time, these files can be ‘merged’ increase efficiency.  Unneeded files after the merge can be removed eventually (but this can only happen after a log backup).

Click through for a demo script to see this in action.

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Parent-Child Relationships And Native Compilation

Ned Otter looks at different ways to insert data with parent-child relationships using natively compiled, memory-optimized procedures: This blog post demonstrates various approaches when using native compilation to insert rows into parent/child tables. First, let’s create tables named Parent and Child, and relate them with a FOREIGN KEY constraint. Note that the Parent table uses […]

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Sizing Memory-Optimized Workloads

Prashanth Purnananda gives us a few notes regarding memory-optimized table sizes: Recovering database with memory-optimized tables involves hydrating the contents of checkpoint files (data/delta files) into memory and then replaying the tail of the log (see this link for more details). One of the important difference between disk based tables and memory-optimized store is frequency of checkpoints. […]

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