October 2015
Intermediate to advanced
432 pages
12h 24m
English
Content preview from Expert Performance Indexing in SQL Server, Second Edition
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CHAPTER 9
Index Maintenance
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
- Statistics
- 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 ...
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