database design patterns

I would like to learn more on "database design patterns ', on the internet, I can't find good web page for this.
It should describe what data models are performed all list and describe when to use them.

CharlesRoos wrote:
Design patterns traditional relational database transactional table is what I'm looking for.

There is not really such a beast - or at least no I ran into when dealing with RDBMS designs. The approach that is usually used is a "high level data model" (often called an entity-relationship diagram). This DR. would then become the plan of action for the implementation of the physical database model.

Also such patterns exist in the database. Simpler is so-called ' header and lines plan tables "which should explain to create 2 tables and link/join with next path and it can become such performance or other problems with this model and so on.

This isn't really a model - is standardization and what is expected of relations in 3NF.

Also, it is wrong to assume that a "+ header - and - line-tables +" exist purely for performance problems. In fact, it can actually be slower done as 2 separate table (using 3NF) more simple using only one table (2NF).

I remember a design methodology called Tetrach (not sure of spelling) I have done a few courses in, in the 1980s. It deals with the prediction of the performance of the relational data models. Simply put - if you have an invoice that usually consists of a single header line and 20 lines of line, processing invoices will require an average of 21 St / s (logical or physical) by Bill. 2NF, it will take a single e/s - however, the data model and then imposes a limit of 20 lines per invoice (never forget the story on such a structure coding problems).

However, if the system is I/O forcing then? You decide on a single i/o per invoice (by limiting the flexibility of the data model) or 21 St / s per invoice (and face the real possibility that the system may be impossible to successfully treat all invoices received in time for shipment orders)?

Well, this isn't really that relevant more with modern equipment of today and storage systems - but it still illustrates to the point that performance alone is not the primary consideration for database designs.

When to use patter 'create 2 separate identical tables to separate the same kind of business objects, for exmple GoodTeachersTable and BadTeachersTable' and explain why and when creating this model. And so on. There are 30 such techniques of model I guess than that. University teaches only that we have "one-to-many" - thing in the world, that I'm not interested.

I think you're confusing models of object oriented with relational data modeling design. There is no "+ patterns +" in the data model relationship - with the exception of different normal is a get - with the fundamental objective of correctly normalizing the data model to 3NF as part of a proven recipe of a robust, functional and scalable data model design.

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