Category: Performance
Item: Objects created with SET Options
What are the set options?
SQL Server backward compatibility SET options allow legacy T-SQL code to run on newer SQL Server versions without changes while supporting ISO SQL standards for new development.
Briefly, they avoid applications that expected non-ISO behavior from breaking.
Why should you care about it?
Creating objects with these settings OFF is not recommended because if you ever want to add a filtered index, indexed views, or other advanced features to tables used within the objects, they cause issues (break).
How to find SQL Server objects with set options?
You can find objects with QUOTED_IDENTIFIER or ANSI_NULLS OFF using the query below.
SELECT OBJECT_SCHEMA_NAME(o.object_id) AS SchemaName
,OBJECT_NAME(o.object_id) AS ObjectName
,o.type_desc AS ObjectType
FROM sys.objects AS o
WHERE0 IN( OBJECTPROPERTY(o.object_id, 'ExecIsQuotedIdentOn'),
OBJECTPROPERTY(o.object_id, 'ExecIsAnsiNullsOn'))
You can find Varchar(n)/varbinary(n) columns with ANSI_PADDING OFF using the query below.
SELECT OBJECT_SCHEMA_NAME(t.object_id) AS SchemaName
,OBJECT_NAME(t.object_id) AS ObjectName
,c.name AS ColumnName
FROM sys.tables AS t
JOIN sys.columns AS c ON c.object_id = t.object_id
JOIN sys.types AS ty ON ty.system_type_id = c.system_type_id AND ty.user_type_id = c.user_type_id
WHERE c.is_ansi_padded = 0
AND ((ty.name IN ('varbinary','varchar') AND c.max_length <> -1)
OR (ty.name IN ('binary','char') AND c.is_nullable = 1))
How to fix them?
- Recreate the object from a session with QUOTED_IDENTIFER and ANSI_NULLS ON to change the persisted OFF setting to ON. Make sure the session setting is ON when executing DDL scripts.
- To change a persisted column ANSI_PADDING setting from OFF to ON, execute ALTER TABLE…ALTER COLUMN from an ANSI_PADDING ON session (specify the same definition as the existing column).
More information
Microsoft – SET QUOTED_IDENTIFIER.
Microsoft – SET ANSI_NULLS.
SET ANSI_NULLS, NOCOUNT and QUOTED_IDENTIFIER, SQL Server Central.
