June 2015
Intermediate to advanced
1800 pages
70h 6m
English
book
Microsoft SQL Server 2014 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft SQL Server 2014 Unleashed
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Deleting Rows
What happens when rows are deleted from a table? How, and when, does SQL Server reclaim the space when data is removed from a table?
Deleting Rows from a Heap
In a heap table, SQL Server does not automatically compress the space on a page when a row is removed; that is, the rows are not all moved up to the beginning of the page to keep all free space at the end. To optimize performance, SQL Server holds off on compacting the rows until the page needs contiguous space for storing a new row.
Deleting Rows from an Index
Because the data pages of a clustered table are actually the leaf pages of the clustered index, the behavior of data row deletes on a clustered table is the same as row deletions from an index page.
When rows are ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.