Principles of Dimensional Modelling
... Advantages and disadvantages Advantages Small savings in storage space Normalized structures are easier to update and maintain Disadvantages Schema is less intuitive Browsing becomes difficult Degraded query performance because of additional joins ...
... Advantages and disadvantages Advantages Small savings in storage space Normalized structures are easier to update and maintain Disadvantages Schema is less intuitive Browsing becomes difficult Degraded query performance because of additional joins ...
Characteristics of Next Generation Databases
... - Note that these basic integrity constraints can be automatically enforced at DDL level by commercial database systems. - Some application-dependent constraints may or may not be enforced at DDL level. (3) Operations - The operations of RDB are formalized by relational algebra, and implemented in S ...
... - Note that these basic integrity constraints can be automatically enforced at DDL level by commercial database systems. - Some application-dependent constraints may or may not be enforced at DDL level. (3) Operations - The operations of RDB are formalized by relational algebra, and implemented in S ...
Database Design: DBS CB, 2nd Edition
... is a collection of related columns or rows in multiple tables ...
... is a collection of related columns or rows in multiple tables ...
SQL un MDX (Multiple Dimensional eXpression language) valodu
... the results of the query, the values for each field listed in the SELECT statement must be unique If the SELECT clause contains more than one field, the combination of values from all fields must be unique for a given record to be included in the results. The output of a query that uses DISTINCT is ...
... the results of the query, the values for each field listed in the SELECT statement must be unique If the SELECT clause contains more than one field, the combination of values from all fields must be unique for a given record to be included in the results. The output of a query that uses DISTINCT is ...
Description - Datu bāzes tehnoloģijas
... the results of the query, the values for each field listed in the SELECT statement must be unique If the SELECT clause contains more than one field, the combination of values from all fields must be unique for a given record to be included in the results. The output of a query that uses DISTINCT is ...
... the results of the query, the values for each field listed in the SELECT statement must be unique If the SELECT clause contains more than one field, the combination of values from all fields must be unique for a given record to be included in the results. The output of a query that uses DISTINCT is ...
SysCache with Sql Dependencies Configuration
... dependencies are generally used for a SQL Server 2000 database but will work with SQL Server 2005 as well. Before you can use SQL Server cache invalidation with table based dependencies, you need to enable notifications for the database. This task is performed with the aspnet_regsql command. With ta ...
... dependencies are generally used for a SQL Server 2000 database but will work with SQL Server 2005 as well. Before you can use SQL Server cache invalidation with table based dependencies, you need to enable notifications for the database. This task is performed with the aspnet_regsql command. With ta ...
Lecture 1
... xacts are all or nothing One simple idea: log progress of and plans for each xact ...
... xacts are all or nothing One simple idea: log progress of and plans for each xact ...
SQL Azure - Bapatla Engineering College
... Customers can also remove the security risks and hassles associated with hosting public-facing apps & websites from within a datacenter by quickly & cost-effectively building websites and mobile & social apps directly on SQL Database. ...
... Customers can also remove the security risks and hassles associated with hosting public-facing apps & websites from within a datacenter by quickly & cost-effectively building websites and mobile & social apps directly on SQL Database. ...
CPS221 Lecture: Relational Database Creation and Design Objectives:
... B. We have already looked at one kind of constraint, called ENTITY INTEGRITY: Each table should have a primary key whose value serves to uniquely identify rows in the table. This follows from the fact that a relational table models a SET, and therefore each row in it must be unique among all the ele ...
... B. We have already looked at one kind of constraint, called ENTITY INTEGRITY: Each table should have a primary key whose value serves to uniquely identify rows in the table. This follows from the fact that a relational table models a SET, and therefore each row in it must be unique among all the ele ...
Overview of Import from Excel Spreadsheets
... example I have added the new columns and renamed existing columns to support by import. Example of Instrument Work Sheet Import 1. To the existing spreadsheet you need to add 3 new columns to the each work sheet. The three columns MUST BE the first three columns of the worksheet. The columns are KEY ...
... example I have added the new columns and renamed existing columns to support by import. Example of Instrument Work Sheet Import 1. To the existing spreadsheet you need to add 3 new columns to the each work sheet. The three columns MUST BE the first three columns of the worksheet. The columns are KEY ...
Basic Concepts of Relational Database
... can use SSN as a primary key. This is how we can guarantee that all rows are unique. - Foreign key is a column or columns whose values are the same as a primary key of another table. Keys can be simple (a single field) or composite (more than one field) Keys usually are used as indexes to speed ...
... can use SSN as a primary key. This is how we can guarantee that all rows are unique. - Foreign key is a column or columns whose values are the same as a primary key of another table. Keys can be simple (a single field) or composite (more than one field) Keys usually are used as indexes to speed ...
chap3-archi and infra
... data warehouse repository • before loading data into the data ware the metadata repository gets populated • For top-bottom approach there could be movements of data from the enterprise-wide data warehouse repository to the repositories of the dependent data marts • For bottom-up approach data moveme ...
... data warehouse repository • before loading data into the data ware the metadata repository gets populated • For top-bottom approach there could be movements of data from the enterprise-wide data warehouse repository to the repositories of the dependent data marts • For bottom-up approach data moveme ...
Document
... execution of query by only reading the necessary records from the database. • Example indices: B+-tree, Hash-index, ISAM, R-tree. • Lots of research papers and Ph.D. thesis have been written on this subject. ICOM 6005 ...
... execution of query by only reading the necessary records from the database. • Example indices: B+-tree, Hash-index, ISAM, R-tree. • Lots of research papers and Ph.D. thesis have been written on this subject. ICOM 6005 ...
Query Processing over a sensor network
... • Data Model: How to represent devices in a uniform way so that queries can be asked to access them? ...
... • Data Model: How to represent devices in a uniform way so that queries can be asked to access them? ...
Concepts of Database Design
... primary key, consider creating an ID Number field for that table. - These keys are usually autonumber fields - Lately, I’ve been using these as the keys in almost all my tables. Primary key requirements: - Unique. No two keys will have the same value - Cannot be null. In multi-field keys, none can ...
... primary key, consider creating an ID Number field for that table. - These keys are usually autonumber fields - Lately, I’ve been using these as the keys in almost all my tables. Primary key requirements: - Unique. No two keys will have the same value - Cannot be null. In multi-field keys, none can ...
Original article Damming the genomic data flood
... This encoding results in a smaller, faster, and more flexible data set, which is more suitable for analysis. While the structure and content change, none of the information contained in the initial data set is lost. Phenotypes are similarly encoded. Phenotype data already in numeric format remains u ...
... This encoding results in a smaller, faster, and more flexible data set, which is more suitable for analysis. While the structure and content change, none of the information contained in the initial data set is lost. Phenotypes are similarly encoded. Phenotype data already in numeric format remains u ...
Official Cert Guide for Popular Oracle 1Z0
... IT costs by simplifying consolidation, provisioning, upgrades, and more. It is supported by a new architecture that allows a container database to hold many pluggable databases. And it fully complements other options, including Oracle Real Application Clusters and Oracle Active Data Guard. An existi ...
... IT costs by simplifying consolidation, provisioning, upgrades, and more. It is supported by a new architecture that allows a container database to hold many pluggable databases. And it fully complements other options, including Oracle Real Application Clusters and Oracle Active Data Guard. An existi ...
Record
... Notice how each record spans several fields. Even though the information in each record is organized into fields, it belongs with the other information in that record. See the number at the left of each row? It’s the ID number that identifies each record. The ID number for a record refers to every p ...
... Notice how each record spans several fields. Even though the information in each record is organized into fields, it belongs with the other information in that record. See the number at the left of each row? It’s the ID number that identifies each record. The ID number for a record refers to every p ...
Data Models
... without changing the logical schema Applications depend on the logical schema In general, the interfaces between the various levels and components should be well defined so that changes in some parts do not seriously influence others. ...
... without changing the logical schema Applications depend on the logical schema In general, the interfaces between the various levels and components should be well defined so that changes in some parts do not seriously influence others. ...
business intelligence and nosql databases
... The other advantages of document stores include: rich data structures – document in a store can represent objects or arrays, thus no ORM (object relational mapping) is required, better performance – data are usually stored in a single table or they are joined in memory, so traditional, time-consumi ...
... The other advantages of document stores include: rich data structures – document in a store can represent objects or arrays, thus no ORM (object relational mapping) is required, better performance – data are usually stored in a single table or they are joined in memory, so traditional, time-consumi ...
document
... Lowest value in a column (first value alphabetically for text data types). Ignores null values. ...
... Lowest value in a column (first value alphabetically for text data types). Ignores null values. ...