December 2017
Intermediate to advanced
434 pages
10h 14m
English
Content preview from SQL Server 2017 Administrator's Guide
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Data storage differences in OLTP
Disk-based data is stored in classic files ( .mdf or .ndf) and divided into small 8 KB parts called data pages. Those data pages are registered within other data pages called Index Allocation Maps (IAMs), and other types of data pages are used for identification, for example which data pages have free space and so on and so forth.
SQL Server uses all data page types to find out proper parts of data needed for request fulfillment, moves the data pages to the buffer cache, and does what's needed according to the user request. The movement of data pages back and forth between the physical disk and the buffer cache incurs significant overhead.
The second big issue occurs when data pages have to be protected against ...
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