database table design best practices

too many records in a table. For example, if there are more than 10 million records, the table should be divided horizontally. The method of horizontal segmentation is to use the primary key of the table When a value of a PK is a boundary, the records of the table are divided horizontally into two tables. If you find

I. Introduction of relational database design paradigm 1.1 First normal form (1NF) no duplicate columns The so-called first normal form (1NF) means that each column of a database table is an indivisible basic data item and cannot have multiple values in the same column, that is, an attribute in an entity cannot have m

I am a newbie. I have been confused for a long time. Today I decided to ask you the correct or common practices. Here is a simple example: id, title, content ,...... Label table: id. The two tables above the title obviously require auto-incrementing IDS as the primary key to ensure uniqueness. Design 1 next... I am a newbie. I am confused about this question for

The following fourteen skills are gradually summarized by many people in a large number of database analysis and design practices. For the use of these experiences, readers should not be able to stick to them, but should digest and understand them, be realistic, and be flexible. And gradually achieve: Development in the application and application in the developm

of flowchart Process Division Document: 1/Realistic Business document collection 2/Document collation and combination 3/Document status changes in different periods of the functional implementation process 4/Document composition elements 5/Document split description and implementation (data source/Data flow/processing action) 6/Document user's permission description and control 7/presentation of specific documents (shown in spreadsheet format) Document Division

database After the file system is processed in C ++, It is appended to the table. This is the experience of designing the telecom billing system.(3) It is found that there are too many records in a table. For example, if there are more than 10 million records, the table should be divided horizontally. The horizontal s

file system is processed in C ++, the database is appended to the table. This is the experience of designing the telecom billing system.(3) It is found that there are too many records in a table. For example, if there are more than 10 million records, the table should be divided horizontally. The horizontal split meth

Summary: For database design, we generally start from the conceptual model. In the conceptual model design phase, we focus on analyzing the logical structure of data to avoid getting into the specific storage details, all designs are irrelevant to specific database products to be used in the future. This article is sui

1. Avoid empty columns in the table; 2. duplicate values or columns should not exist in the table; III:The record in the table should have a unique identifier.When designing a database table, the database administrator should deve

. The relationships in relational databases must meet certain requirements, that is, they must meet different paradigms. Currently, relational databases have six paradigms: 1NF, 2NF, 3NF, 4NF, and 5NF) and the sixth paradigm (6NF ). The first paradigm (1NF) meets the minimum requirements ). The second Paradigm (2NF) that meets more requirements on the basis of the first paradigm, and the other paradigms are similar. Generally, databases only need to satisfy the 3NF. The following is an example o

instead of non-fixed-length field (such as char instead of varchar2), the data row size can be reduced more or less, increase the hit rate of the database buffer pool; 2. Primary keys. The selection of primary keys will have a great impact on the stability and efficiency of table indexes. Generally, we recommend that you consider the unique value that the database