BCS THE CHARTERED INSTITUTE FOR IT BCS HIGHER EDUCATION QUALIFICATIONS
... Cascaded rollback - when transaction T1 fails and induces a rollback which in turn causes other transactions - which were dependent on the success of T1 – to likewise fail and be rolled back. Optimistic locking – based on the assumption that inter-transaction conflict is rare so individual transacti ...
... Cascaded rollback - when transaction T1 fails and induces a rollback which in turn causes other transactions - which were dependent on the success of T1 – to likewise fail and be rolled back. Optimistic locking – based on the assumption that inter-transaction conflict is rare so individual transacti ...
Lab 13-final
... 3.per capita GDP is the GDP divided by the population GDP/population Calculations are usually done in select clause .A new column is created with the calculation .It is a better practice to use an alias for a calculated column . Aliases : Aliases are defined in the from clause, called in select and ...
... 3.per capita GDP is the GDP divided by the population GDP/population Calculations are usually done in select clause .A new column is created with the calculation .It is a better practice to use an alias for a calculated column . Aliases : Aliases are defined in the from clause, called in select and ...
Chapter 1
... Provide a mechanism to customize appearance of database Present consistent, unchanging picture of structure of database – Even if underlying database changed ...
... Provide a mechanism to customize appearance of database Present consistent, unchanging picture of structure of database – Even if underlying database changed ...
Data Resource Management
... some entity (object, person, place or event) Record • Key field Table Database Database Management System – DBMS • Interface between user and data ...
... some entity (object, person, place or event) Record • Key field Table Database Database Management System – DBMS • Interface between user and data ...
Building CASE Tools Data Base Using Microsoft SQL
... • The program must open the connection to the data source before executing one or more SqlCommands and close the connection once no further access to the data source is required. • Class DataTable (namespace System.Data) represents a table of data. • A DataTable contains a collection of DataRows tha ...
... • The program must open the connection to the data source before executing one or more SqlCommands and close the connection once no further access to the data source is required. • Class DataTable (namespace System.Data) represents a table of data. • A DataTable contains a collection of DataRows tha ...
Foreign and Primary Keys in RDM Embedded SQL
... and on update cascade clauses specify what is to happen when a row of the author table is deleted or updated. When cascade is specified then on a delete all of the related book rows will automatically be deleted as well. On an update of the author's primary key column (e.g., fixing a misspelled auth ...
... and on update cascade clauses specify what is to happen when a row of the author table is deleted or updated. When cascade is specified then on a delete all of the related book rows will automatically be deleted as well. On an update of the author's primary key column (e.g., fixing a misspelled auth ...
VITAL STATISTICS SYSTEM
... Country tabulations are not synchronised with DYB questionnaires Data compilation is a gigantic process for the countries Needs considerable time and energy for its filling up Compilation error can not be over ruled ...
... Country tabulations are not synchronised with DYB questionnaires Data compilation is a gigantic process for the countries Needs considerable time and energy for its filling up Compilation error can not be over ruled ...
Exploring Microsoft Access
... • Use aggregate functions to create a Totals query • Use Microsoft Graph to create a chart based on a table or query • Use the Switchboard Manager to create and/or modify a switchboard ...
... • Use aggregate functions to create a Totals query • Use Microsoft Graph to create a chart based on a table or query • Use the Switchboard Manager to create and/or modify a switchboard ...
Database
... We have seen the syntax that establishes foreign keys in Figure3. In order to establish reference integrity between two tables with a 1:M relationship in the relational data model, the primary key of the table on the one-side will be referenced by a column in the table on the many side of the relati ...
... We have seen the syntax that establishes foreign keys in Figure3. In order to establish reference integrity between two tables with a 1:M relationship in the relational data model, the primary key of the table on the one-side will be referenced by a column in the table on the many side of the relati ...
abstract - IndiaStudyChannel.com
... – When your application retrieves relatively few (large) complex objects and works on them for a long period before moving to the next object – When you are happy programming in an OO language ...
... – When your application retrieves relatively few (large) complex objects and works on them for a long period before moving to the next object – When you are happy programming in an OO language ...
Taming the Big Data Fire Hose
... Support millions of write operations per second at scale Read and write latencies below 50 milliseconds ...
... Support millions of write operations per second at scale Read and write latencies below 50 milliseconds ...
iOS/SQLite (Powerpoint)
... • SQLite is called an embedded database because its primary use is to provide data persistence to your app, it is an integral part of your app. • Apps do not share Embedded Databases the way they share databases like Oracle and DB2. ...
... • SQLite is called an embedded database because its primary use is to provide data persistence to your app, it is an integral part of your app. • Apps do not share Embedded Databases the way they share databases like Oracle and DB2. ...
Document
... • Integrity constraints (e.g., account balance > 0) become “buried” in program code rather than being stated explicitly • Hard to add new constraints or change existing ones ...
... • Integrity constraints (e.g., account balance > 0) become “buried” in program code rather than being stated explicitly • Hard to add new constraints or change existing ones ...
bea.gov Comments and plans
... submission has been based on spreadsheets with a gradual increase in details and metadata. Process involved exporting data to spreadsheets—a timeconsuming and often error prone process. ...
... submission has been based on spreadsheets with a gradual increase in details and metadata. Process involved exporting data to spreadsheets—a timeconsuming and often error prone process. ...
Database System Architectures
... where the transactions are executed, and results are shipped back to the client. ...
... where the transactions are executed, and results are shipped back to the client. ...
Update Database
... to execute a SQL statement or a stored procedure. • DataReader: It is a read-only and forward-only pointer into a table to retrieve records. • DataSet Object: A DataSet object can hold several tables and relationships between tables. • DataAdapter: This the object used to pass data between the datab ...
... to execute a SQL statement or a stored procedure. • DataReader: It is a read-only and forward-only pointer into a table to retrieve records. • DataSet Object: A DataSet object can hold several tables and relationships between tables. • DataAdapter: This the object used to pass data between the datab ...
Document
... • The “very esoteric” one that is probably not required to get the most out of your database. • “The original table must be reconstructed from the tables into which it has been broken down.” • The rule ensures that you have not created any extraneous columns and all the tables are only as large as t ...
... • The “very esoteric” one that is probably not required to get the most out of your database. • “The original table must be reconstructed from the tables into which it has been broken down.” • The rule ensures that you have not created any extraneous columns and all the tables are only as large as t ...
Lecture: SQL1
... Foreign key at the child table should be of the same type (and values) of the primary key at the parent table ...
... Foreign key at the child table should be of the same type (and values) of the primary key at the parent table ...
INTRODUCTION TO TRANSACTION PROCESSING
... • In fact, same problem if just 6 executed between a and c ...
... • In fact, same problem if just 6 executed between a and c ...
The Relational Data Model
... system must be uniquely identified by some column or combination in that table. All columns (or combinations of columns) in a table with unique values are referred to as Candidate keys. Among the candidate keys found in a table one can be selected as a primary key of that table and all other candida ...
... system must be uniquely identified by some column or combination in that table. All columns (or combinations of columns) in a table with unique values are referred to as Candidate keys. Among the candidate keys found in a table one can be selected as a primary key of that table and all other candida ...