teradata physical database design pdf

Label:"The work of physical design"① Choosing the Right Database management system: Oracle,sqlserve,mysql,pgsql② defining naming conventions for databases, tables, and fields③ Select the appropriate field type according to the selected DBMS system④ Anti-Normalization design-consider reading efficiency and adding approp

Tags: structural design database Physical design dependent applicationPhysical Design of databaseThe storage structure and access method of the database on the physical device is called

Tags: var mysq detailed char BSP strong ext Arc MysI. Physical design core tasks and key details Second, the physical design experience 1. Data type design: Suggested field data type definitions are combined with the following points (for example, MySQL) 1) does not use im

Tags: making share pictures strong post consumer structure conversion summary creationContentFirst method: Conceptual model to physical model 1. First new model-select concept model (CDM) 2, the new entity (students and cards), set the corresponding properties 3, a total of four relations (1:1,1:N,N:1,N:N), according to their own needs to establish a relationship 4, establish a relationship between the entities, we can be converted into a

Label:OverviewRegardless of which database we use, no matter how we design the database, I would like to follow a principle: data security and performance efficiency of the two main aspects, but about these two aspects of the topic too much, here is not a statement, I just from the database of

1. Naming Conventions are often used for database development. 1> use a singular table name that does not contain numbers. You can add a module name prefix if necessary. 2> for primary key naming, the table name + id is used. 3> the names of the columns that serve as foreign keys should be the same as the names of their corresponding primary keys, unless the foreign keys maintain a self-inverse/recursive relationship. 4> avoid abbreviations.

way to handle. For example, often to edit or modify the picture, then stored in the database is a good choice.Second, the solution uses BLOB types when neededWhen stored, use a binary blob to store the file.Pictures are stored in the database and do not require additional loading, and there is no risk of incorrect file paths.Deleting a record also deletes the picture.When the record is updated, locks are a

Tags: according to SQ ext rate Large Database file name concept consumer-to-consumer. comOriginal: Database Design---powerdesigner (physical model and conceptual model)ContentFirst method: Conceptual model to physical model1. First new model-select concept model (CDM)2, the

This book is available on zhuoyue. It is a little cheaper than buying from Amazon.com. It is in English. It was recommended by data model Resource Book voluem 3 and I just bought it. This book describes the basic knowledge of physical database design. It targets SQL, Oracle, and DB2. I read some of them. It is quite good. However, this is not the most suitable o

the number of digits after the decimal point. The number of the decimal part is also counted in its effective bit, so the accuracy of 9 ticks 2 means that 1234567.89 can be stored. After the decimal point can not be more or less, the total number of digits can not be less.At this point, if you scale the value 1 billion times times more, you'll be sure to get the expected values:SELECT * from Number WHERE = 59.9559950000000. The two types of numeric and decimal behave the same, without any dif

Some time ago, I wrote 《Ripple: When the generic method meets the abstract class-my "Memory Database" birthnotes", Recorded the design process of the PDF. Net memory database, and made some minor changes recently. It has been put into production and is currently running well. I looked at the source code again today and

object. 4. Values are saved in UTC (It stores the number of milliseconds)5. Time zone conversion, the current time zone is converted when stored, and then converted back to the current time zone.6. The default value is Current_timestamp (), which is actually the current system time. 7. The database automatically modifies its value, so you do not need to specify the name of the timestamp field and the value of the timestamp field when inserting a reco

, single-column, computer-generated, non-editable, and invisible to users. 2.1 create a primary key Creating indexes using clustered indexes in table structure design is not the best because each table can only create one clustered index, this will lead to the loss of the opportunity to create other more effective clustered indexes for each table. Create a non-clustered index primary key using an SQL statement: CREATE TABLE dbo.Product( ProductID

be seamlessly expanded based on changes in business needs. In addition, a good plan will take into account workload changes. The main goal of capacity planning is to determine the requirements of system resources, design a balanced system, and optimize resources to achieve the best performance and throughput to meet business needs. When we discuss database scale adjustment and capacity management, DB2

already had a foreign surname, you have to keep this obsolete value. But the drop-down list box is no longer available to the user, which is a big hassle.4, transplant poor, CHECK, constraint, trigger syntax in a variety of databases are not the same, the transplant is very difficult.Third, the solutionCreate a checklist with each row containing the values that allow the last name to appear, and then define a foreign key constraint.This you know, no more nonsense.Unless you are sure that these

Atitit. Physical storage structure principle and architecture design and practice of database tables 1. The storage model for Oracle and DB2 databases is shown in figure: 1 1.1.2. Storage of table data in blocks and ROWID information 3 2. The physical storage structure of the data table is natural sequence, with the

Download address: Download the network disk Content Profile ... The database index design and optimization provides a simple, efficient and universal method for the design of relational database indexes. Through systematic explanation and a large number of cases, the author clearly illustrates the principle of access