data mart schema

regions because customers have analysis needs and need data support for analysis. Number of independent instancesThe data mart is a service-specific analysis application. For applications, the independent and dependent data mart should be similar.Because currently, the mod

Recent reverie, the non-formatting trend of data storage.Formatting tables to free XML storageSeveral years ago, several database vendors began to store XML databases. XML data as a self-describing semi-structured data provides a new data model for Web data management, if XM

High-performance Mysql -- Schema and data type optimization; high-performance Mysql Schema Good logical design and the foundation of High Performance for physical designers1. Select an Optimized Data TypeSmaller is usually betterCPU cycle required for smaller disk, memory, CPU cache, and processingEasy to useThe opera

the code of the transaction script is complex enough to be difficult to maintain, You can gradually create activity records and then add behavior to them, that is, wrap the table into activity records, then add the domain logic. The most complex and advanced approach is the domain model. From the above description, we can easily know how to modify the code of the table data entry or row data entry in this

The Data source schema mode-table entry mode Table entry mode acts as an object in the database table access entry, and one instance handles all rows in the table. can be understood to encapsulate SQL statements that were previously dispersed across pages, and a table is an object that handles all the business logic associated with the table, which improves the reusability of the code. Now, when I

In a traditional large project, after a business model is created, data definitions are repeatedly divided into the following parts during the implementation phase:1. Database2. Data Layer entity or DTO3. Transmission objects at the service layer4. Data at the presentation layer5. user input6. Reports and other applications... Each layer above defines its own

. WriteElementString ("Quantity", MyNamespace, excel_quantity); Writer.WriteElementString ("RequiredDate", MyNamespace, Excel_required_date. Year + "-" + excel_required_date. Month + "-" + excel_required_date. Day); Writer. WriteElementString ("Storagelocation", MyNamespace, excel_storage_location); Writer. WriteElementString ("Remark", MyNamespace, Excel_remark); Writer. WriteEndElement (); Writer.

Design from another perspective: Global Business data definition based on schema. In a traditional large project, after a business model is created, data definitions are repeatedly divided into the following parts during the implementation phase:1. Database2. Data Layer entity or DTO3. Transmission objects at the serv

Background: The data type of some fields in the Hive table has been modified, such as from String-> Double, at which point the underlying file format for the table is parquet, after the modification, the Impala index is updated, and then the fields that modify the data type appear with the Parquet Problem with schema column d