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What does it mean to Denormalize a table and why would it be done?
Denormalization is a strategy used on a previously-normalized database to increase performance. The idea behind it is to add redundant data where we think it will help us the most. We can use extra attributes in an existing table, add new tables, or even create instances of existing tables.
When should you Denormalize database design?
Only if you need your database to perform better at particular tasks (such as reporting) should you opt for denormalization. If you do denormalize, be careful and make sure to document all changes you make to the database.
What are some different types of indexes in SQL?
There are various types of indexes in SQL server:
- Clustered Index.
- Non-Clustered Index.
- Column Store Index.
- Filtered Index.
- Hash Index.
- Unique Index.
What is the opposite of normalize?
Opposite of to make normal, to make standard. destabiliseUK. destabilizeUS. reverse.
What do you mean by denormalization in a database?
Denormalization in Databases. Denormalization is a database optimization technique in which we add redundant data to one or more tables.
Are there any drawbacks to using denormalization?
In some ways, this is great; if a teacher changes his or her name, we only have to update the name in one place. The drawback is that if tables are large, we may spend an unnecessarily long time doing joins on tables. Denormalization, then, strikes a different compromise.
Which is the starting point for the denormalization process?
A normalized database is the starting point for the denormalization process. It’s important to differentiate from the database that has not been normalized and the database that was normalized first and then denormalized later. The second one is okay; the first is often the result of bad database design or a lack of knowledge.
How to avoid a table join in denormalization?
We can avoid a table join by denormalizing the Messages table through adding the first_attachment_name column. Naturally, if a message contains more than one attachment, only the first attachment will be taken from the Messages table while other attachments will be stored in a separate Attachments table and, therefore, will require table joins.