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Tips for using constraints in SQL Server 2019

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Tips for using constraints in SQL Server 2019 Avoid using CHECK_CONSTRAINTS hint with bulk copy program. Using this hint can significantly degrade performance of the bulk copy operation, because for each row loaded the CHECK constraints defined on the destination table will be executed. Without the CHECK_CONSTRAINTS hint, any CHECK constraints will be ignored. Consider using the NOT FOR REPLICATION...

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Tips for using indexes in SQL Server 2017 (Part 2)

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Tips for using indexes in SQL Server 2017 (Part 2) If you create a composite (multi-column) index, try to order the columns in the key so that the WHERE clauses of the frequently used queries match the column(s) that are leftmost in the index. The order of the columns in a composite (multi-column) index is very important. The index will...

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Tips for using indexes in SQL Server 2017 (Part 1)

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Tips for using indexes in SQL Server 2017 (Part 1) Create a clustered index for each table. If you create a table without clustered index, the data rows will not be stored in any particular order. This structure is called a heap. Every time data is inserted into this table, the row will be added to the end of the...

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Tips for using SQL Server 2017 triggers

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Tips for using SQL Server 2017 triggers Try to use CHECK constraints instead of triggers whenever possible. Constraints are much more efficient than triggers and can boost performance. Constraints are also more consistent and reliable in comparison with triggers, because you can make errors when you write your own code to perform the same actions as the constraints. So, you...

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Tips for using constraints in SQL Server 2017

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Tips for using constraints in SQL Server 2017 Use cascading referential integrity constraints instead of triggers whenever possible. For example, if you need to make cascading deletes or updates, specify the ON DELETE or ON UPDATE clause in the REFERENCES clause of the CREATE TABLE or ALTER TABLE statement. The cascading referential integrity constraints are much more efficient than triggers...

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SQL Server

Tips for using constraints in SQL Server 2016

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Tips for using constraints in SQL Server 2016 Try to create a single column constraint. The more columns the constraint will have, the slowly it will work and the more stored space it will require. Use default constraints instead of DEFAULT objects. DEFAULT object are provided for backward compatibility and has been replaced by default definitions (default constraints) created using […]

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Tips for using constraints in SQL Server 2014

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Tips for using constraints in SQL Server 2014 Use CHECK constraints instead of rules. Rules are provided for backward compatibility and have been replaced by CHECK constraints. Constraints are much more efficient than rules and can boost performance. Rules have some restrictions. For example, only one rule can be applied to a column, but multiple CHECK constraints can be applied....

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