March 2018
Intermediate to advanced
816 pages
19h 35m
English
Content preview from SQL Server 2017 Developer???s Guide
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History table overhead
Converting a non-temporal table into a temporal table is very easy. With two ALTER TABLE statements you get the full temporal table functionality. However, this cannot be completely free. Adding temporal features to a table brings performance overhead in all data modification operations. According to Microsoft, a single update operation against a row in a temporal table is about 30% slower than it would be when the table is non-temporal.
I have performed a simple test where I have updated a different number of rows in a table before it is converted to a temporal table and afterwards. The following graph displays results of this test. For a small amount of rows (<1000), locking, calculating, and inserting data into a ...
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