December 2017
Intermediate to advanced
434 pages
10h 14m
English
Content preview from SQL Server 2017 Administrator's Guide
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Reorganize index
Data stored in the database tables is changing by inserting new records as well as updating or deleting existing ones. It leads to a situation when data pages are not full and also not in logical order within extents. We can talk about internal (data pages not full) and external (data pages in extents not in logical order) fragmentation. This state of data leads to decreased performance time over time.
IO controller has its throughput. In a given amount of time, some finite number of data pages could be transferred through the controller. In an optimized case, every data page will be almost full of records, but when internally fragmented, the same amount of data pages will bring much fewer records.
In an ideal situations, ...
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