Like anything in life, indexes require maintenance. Over time, the performance benefits of indexes can wane or, through data modifications, their sizes and the underlying statistics can bloat. To prevent these issues, indexes must be maintained. If you do so, your database will remain a lean, mean querying machines.
When it comes to maintenance, there are six areas to consider:
- Index fragmentation
- Heap bloat and forwarding
- Columnstore fragmentation
- In-memory statistics
Each plays a key role in maintaining a properly indexed and well-performing database.
This chapter explains all these areas. You’ll learn ...