effective oracle by design

During the design of the Oracle table, developers always disagree with the field type. The following example shows how to design the field as number and the result is varcha. During the design of the Oracle table, developers always disagree with the field type. The following

Tags: Nextval SQL statement throws exception handling implicitly no i+1 func has a1. Database design: For user-specific needs, then we create a most practical and high performance database! Steps for database design: 01. Demand Analysis 02. Conceptual Structure Design 03. Logical Structure Design 04. Physical Organizat

oracle| Design | data | database | Database design Requirements Prerequisite: Data changes 1~2 times per year, software estimated life cycle 50 Practice Environment: Oracle Spatial Glossary: spatio-temporal objects, snapshots Spatio-Temporal object: The space and time range and its attribute information that a geo

joins the video club. The owner or administrator can enter, save, and query related information of each album and each member as needed. Use Oracle SQL developer data modeler design to generate code.Because images and other content cannot be inserted, only generated code is published first.The first time the content was published, the Experts laughed. Oracle SQL

inconsistent. In addition, it is best to add row numbers when designing databases. For example, in sales order management, the ID number cannot be maintained by the user. However, you can maintain the row number. For example, in the sales order line, you can sort the order line by adjusting the size of the row number. Generally, the ID column is progressive in units of 1. However, the row number must be progressive in the unit of 10. In this case, the row numbers are expanded in order of 10, 20

designing a database table, the database administrator should develop a good habit of using an ID number to uniquely identify a row record, rather than distinguishing records by names, numbers, and other fields. Each table should have an ID column, and neither of the two records can share the same ID value. In addition, it is best to have a database for automatic management of this ID value, instead of assigning this task to the foreground application. Otherwise, the ID values may be inconsiste

I just read the article about oracle efficient design. When it comes to Standard Quantum queries in oracle, the performance depends on associated queries, however, I know in SQL server that the performance of associated queries is better than that of scalar queries. Let's test the performance by executing the statement: Code highlighting produced by Actipro CodeH

. Typical AOP, proxies, and transactions are all extended through this interface. Our extension points are also here. Please refer to the BEANFACTORYPOSTPROCESSOR structure for his structure. After the bean is created, spring is basically finished working on the big factory. At this point he will send an event informing the relevant interface. The structure diagram is as follows Without any suspense, this is a typical application of the observer pattern. There are also two

constraints on fields or tables. The benefits are: savings in table design time and reduced time to change. The downside is that, after all, the business logic needs to be implemented through other programs, the data must be checked in the program, and it must be checked in every application, and it may take less time and possibly more. This habit, generally not good, although the design time savings, but

a long time (5). Must satisfy the first second normal form, as far as possible to meet the third paradigm ( attribute atomicity constraints, the uniqueness of the record constraints, the constraints of field redundancy ) (6). To have a concise E-r diagram: simple entities, diagrams (7). To comply with integrity constraints 3. Audit Database Design Three. Data model 1. Relational model E-r diagram: Designing a database through relationships between e

Document directory 1.1 Conventions 1.2 table name 1.3 stored procedures 1.4 View 1.5 Index Sequence 1.6 1.7 primary key 1.8 foreign key 2.1 provisions 2.2 field specifications 3.1 Integration 3.2 Query 3.4 Delete 3.5 modify 1 naming principles 1.1 Conventions Ü refers to naming conventions for databases and database objects, such as tables, fields, indexes, sequences, and stored procedures; Ü Use meaningful English words for naming. Do not use abbreviations, which are composed

" sysdate {data record creation date}{}{} catalog metadata file_cataloguemetadata catalogueid catalog number varchar2 50 no Yes {catalog number}{}{} file_catalogue id catalog metadata file_cataloguemetadata metadataid meta Data number nvarchar2 50 no Yes

Principles of Database Physics design 1.1 Database Environment Configuration principles 1.1.1 Operating System Environment: For small and medium-sized database system, the use of Linux operating system is more appropriate, for the database redundancy requirements of a higher load balancing system, you can use the Oracle9i RAC Cluster database method, cluster nodes in the range of 2-64. For large database systems, you can use the Sun Solaris SPARC 6

relate to the World Cup scoring players in the club's performance, to the first form of association, first know Ronaldinho's ID number, and then find the corresponding club performance. Table 1, a row of data to the corresponding to the 1 columns of data in table 2, table 2 of the 1 columns of data to the corresponding table 1 of the 1 rows of data, in the two large tables in the million bar, this association cost is quite high. Although the two tables conform to the good paradigm, the correlat

File_cataloguemetadata Catalogueid Catalog number Varchar2 50 Whether Is Is {Catalog number} {}{} File_catalogue Id Catalog Meta Data File_cataloguemetadata Metadataid Meta Data number Nvarchar2 50 Whether Is Is {meta-data number} {}{} File_metadata Metadatano Catalog Meta Data File_cataloguemetadata Allownone

transfer function dependency on either of the candidate key fields is 3NF compliant.Let's take a look at the optimized table in the example above 3-1 Studentno Cardno Userid UserLevel Date Time 021101 001 Operator Operator 2011/10/03 09:00 In the table, a userid can determine a userlevel. In this way, the UserID relies on Studentno and Cardno, and Userlevel relies on UserID, which leads to a transitive d

data and attribute data are organized by the concept of spatio-temporal objects, which makes it possible to query and analyze the history of objects change. The process of the application layer shielding historical data is treated as one of the functions of database module. Technical points: 1, the Oracle package variable session independence. 2, Dynamic View technology (based on the function of the view) Each space-time object is described by mu