Methodology – Physical Database Design
... Overview of Physical Database Design Methodology Step 4 Translate global logical data model for target DBMS Step 4.1 Design base relations Step 4.2 Design representation of derived data Step 4.3 Design enterprise constraints ...
... Overview of Physical Database Design Methodology Step 4 Translate global logical data model for target DBMS Step 4.1 Design base relations Step 4.2 Design representation of derived data Step 4.3 Design enterprise constraints ...
Overview of Content Providers Creating a Content Provider
... A few considerations to take in mind while creating your database: ...
... A few considerations to take in mind while creating your database: ...
Pro2 Enterprsie & Progress Data Replication Strategies
... when there is more than one root or zero
...
... when there is more than one root or zero
Data Abstraction
... A data model is a collection of concepts for describing data properties and domain knowledge: Data relationships Data semantics Data constraints ...
... A data model is a collection of concepts for describing data properties and domain knowledge: Data relationships Data semantics Data constraints ...
New Technologies for Delivering Data to Internal and External Clients
... have visual representations: Web data entry forms, MDBB's, Web page browsers, and electronic codebooks. What we consider the same 'data' have different shapes and structures in container objects than in an RDBMS or in an XML stream. So, how do we get from forms to data? How do we serve data to inter ...
... have visual representations: Web data entry forms, MDBB's, Web page browsers, and electronic codebooks. What we consider the same 'data' have different shapes and structures in container objects than in an RDBMS or in an XML stream. So, how do we get from forms to data? How do we serve data to inter ...
Chapter 7: Database Systems
... Database A collection of data organized to meet users’ needs Database management system (DBMS) Software used to access database Database system Comprised of database, DBMS, and application ...
... Database A collection of data organized to meet users’ needs Database management system (DBMS) Software used to access database Database system Comprised of database, DBMS, and application ...
SQL Server Permissions and Security Principals
... Similar to stored procedures, a VIEW will allow a user to SELECT data from tables that the user does not have access to. Views are provisioned similarly to Tables and can even be UPDATEable (UPDATE, INSERT, DELETE) in the following conditions: • The view references only a single table. • No aggr ...
... Similar to stored procedures, a VIEW will allow a user to SELECT data from tables that the user does not have access to. Views are provisioned similarly to Tables and can even be UPDATEable (UPDATE, INSERT, DELETE) in the following conditions: • The view references only a single table. • No aggr ...
Logical structure of a transaction
... • It is assumed that BLOCK and BLOCK_TRANSACTION tables shadow the actual blockchain ledger for query purpose. But if the database provides blockchain attributes such as immutable tables and atomic updates, the primary blockchain ledger could be in the database, ensuring that the blockchain ledger a ...
... • It is assumed that BLOCK and BLOCK_TRANSACTION tables shadow the actual blockchain ledger for query purpose. But if the database provides blockchain attributes such as immutable tables and atomic updates, the primary blockchain ledger could be in the database, ensuring that the blockchain ledger a ...
DIVISION PPt - University of Arkansas
... If there is something besides the topics for this lesson that you’re not familiar with in this presentation, please review earlier lessons in the Advanced SQL presentations. ...
... If there is something besides the topics for this lesson that you’re not familiar with in this presentation, please review earlier lessons in the Advanced SQL presentations. ...
DB312: SQL Server 2005 Manageability SP2 Improvements
... Rich engine allows for sample data generation Useful because it’s often not feasible (or even legal) to use production data Allows for repeatable test scenarios Support for different types of generators Simple for standard data types Complex for regular expressions, foregin key ...
... Rich engine allows for sample data generation Useful because it’s often not feasible (or even legal) to use production data Allows for repeatable test scenarios Support for different types of generators Simple for standard data types Complex for regular expressions, foregin key ...
What is a Database Management System?
... Joining with SQL • Attributes in the answer (result) may come from two or more tables. • Joining is actually to link multiple tables together under certain conditions, which is similar to the join operator in relational algebra. • Two ways to define a join with SQL92 Standard – List all the partici ...
... Joining with SQL • Attributes in the answer (result) may come from two or more tables. • Joining is actually to link multiple tables together under certain conditions, which is similar to the join operator in relational algebra. • Two ways to define a join with SQL92 Standard – List all the partici ...
Love Will Keep Us Together
... Auto-generated commands include PK and all fields in UPDATE and DELETE statements Developer can specify own custom SQL statements (e.g. if 2 of the 5 columns were modified) ...
... Auto-generated commands include PK and all fields in UPDATE and DELETE statements Developer can specify own custom SQL statements (e.g. if 2 of the 5 columns were modified) ...
(PPT, Unknown)
... store and manipulate scalar values such as integers and strings organized within tables. The programmer must either convert the object values into groups of simpler values for storage in the database (and convert them back upon retrieval), or only use simple scalar values within the program. Objectr ...
... store and manipulate scalar values such as integers and strings organized within tables. The programmer must either convert the object values into groups of simpler values for storage in the database (and convert them back upon retrieval), or only use simple scalar values within the program. Objectr ...
Topics in Informatics - University of Saint Joseph
... • The primary key of a relational table uniquely identifies each record in the table. It can either be a normal attribute that is guaranteed to be unique (such as Social Security Number in a table with no more than one record per person) or it can be generated by the DBMS (such as a globally unique ...
... • The primary key of a relational table uniquely identifies each record in the table. It can either be a normal attribute that is guaranteed to be unique (such as Social Security Number in a table with no more than one record per person) or it can be generated by the DBMS (such as a globally unique ...
Transaction Management Overview
... pages in the buffer pool at the time of the crash. Redo: Redoes all updates to dirty pages in the buffer pool, as needed, to ensure that all logged updates are in fact carried out and written to disk. Undo: The writes of all Xacts that were active at the crash are undone (by restoring the before val ...
... pages in the buffer pool at the time of the crash. Redo: Redoes all updates to dirty pages in the buffer pool, as needed, to ensure that all logged updates are in fact carried out and written to disk. Undo: The writes of all Xacts that were active at the crash are undone (by restoring the before val ...
Lecture notes
... statements, thinks better of it and issues a ROLLBACK statement. If Sally executes her statements after (ins) but before the rollback, she sees a value, 3.50, that never existed in the database. ...
... statements, thinks better of it and issues a ROLLBACK statement. If Sally executes her statements after (ins) but before the rollback, she sees a value, 3.50, that never existed in the database. ...
Module 1: Introduction
... The foreign key clause lists the attributes that comprise the foreign key and the name of the relation referenced by the foreign key. By default, a foreign key references the primary key attributes of the referenced table. ...
... The foreign key clause lists the attributes that comprise the foreign key and the name of the relation referenced by the foreign key. By default, a foreign key references the primary key attributes of the referenced table. ...
Slide 1
... Most data are stored as file collections in proprietary formats or universally adopted formats like netCDF, GRIB, HDF5. ...
... Most data are stored as file collections in proprietary formats or universally adopted formats like netCDF, GRIB, HDF5. ...
PDF
... The levels above the RM in openEHR contain models of domain concepts, called archetypes and templates, which are expressed as constraints on structures made out of the reference model building blocks [5], using an archetype model (AM). An archetype can be explained as a meta-model describing the nam ...
... The levels above the RM in openEHR contain models of domain concepts, called archetypes and templates, which are expressed as constraints on structures made out of the reference model building blocks [5], using an archetype model (AM). An archetype can be explained as a meta-model describing the nam ...
Z36149154
... sources, or sampling errors. Much research has been published in the area of managing in databases. In many cases, only partially aggregated data sets are available because of privacy concerns. Thus, each aggregated record can be represented by a probability distribution. In other privacy-preserving ...
... sources, or sampling errors. Much research has been published in the area of managing in databases. In many cases, only partially aggregated data sets are available because of privacy concerns. Thus, each aggregated record can be represented by a probability distribution. In other privacy-preserving ...
Analyzing & Optimizing T-SQL Query Performance Part1
... • Build a baseline performance profile. • Makes you familiar with the operational behavior of each app/server. • Clearly documents what is “normal” for a server and/or application. • Identifies types of problems that arise even when the server is behaving normally: • Some problems require a response ...
... • Build a baseline performance profile. • Makes you familiar with the operational behavior of each app/server. • Clearly documents what is “normal” for a server and/or application. • Identifies types of problems that arise even when the server is behaving normally: • Some problems require a response ...
12 SQL
... For each column, a name and a data type must be specified and the column name must be unique within the table definition. Column definitions are separated by comma. Uppercase and lowercase letters makes no difference in column names, the only place where upper and lower case letters matter are strin ...
... For each column, a name and a data type must be specified and the column name must be unique within the table definition. Column definitions are separated by comma. Uppercase and lowercase letters makes no difference in column names, the only place where upper and lower case letters matter are strin ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.