May 2019
Intermediate to advanced
484 pages
11h 23m
English
Content preview from Learn T-SQL Querying
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Set options
Set options lists the SET options that were current as of compile time. These options determine the handling of specific information and may be different at runtime because they are based on the current session. The options tracked are ANSI_NULLS, ANSI_PADDING, ANSI_WARNINGS, ARITHABORT, CONCAT_NULL_YIELDS_NULL, NUMERIC_ROUNDABORT, and QUOTED_IDENTIFIER. These SET options affect estimations and query results, which means that if one option is changed inside of a batch, a recompilation must happen. Keep these options in mind when analyzing a query that may meet the expected performance in a development or pre-production system but performs poorly in a production system.
For example, ANSI_NULLS specifies the ISO-compliant behavior ...
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