KB-30261: Using an SQL 2005 Express database.
Question: How can I establish communication between E3 and SQL 2005 Express ? Solution: To do so, add a database to E3, access its properties, and set it up as…
Database Servers: Introduction.
Question: What is a Database Server? What is it for? Solution: A DBServer, or a Database Server, is the application item that concentrates all the project’s data records and queries…
KB-31829: Remote recording in Oracle/SQL Server.
Question: Can data be recorded in a remote Oracle or SQL Server? Solution: Yes; to do so, you must just enable the Oracle/SQL Server to accept remote data recording.
KB-30971: Changing database type.
Question: If an application starts with an Access database and in the middle of the process it migrates to SQL/Oracle, will the previous data be sent to the new database?…
Utilizando grupos de tags OPC.
Descrição: Em uma aplicação projetada para comunicar com 1500 tags OPC, qual a melhor opção de arquitetura para o cliente OPC: múltiplos grupos OPC com um reduzido número de tags…
Using OPC tag groups.
Question: In an application designed to communicate with 1500 OPC tags, which of the following is the best option for the OPC client: several OPC groups with fewer tags (for…
KB-31698: Number of SQL clients required in an E3 application.
Question: How many SQL client licenses are required in an application with two E3Servers (in Hot-Standby) and five Viewers? Solution: The communication between E3 and the database happens exclusively in…
KB-26755: Access database and application performance.
Question: My application’s got slower after two weeks working with an Access database. Why has this happened, and how can I fix it? Solution: This may have happened because the…
Structure Query Language (SQL): Chapter 7 – Views.
A view is an alternative solution for observing data from one or more of the tables comprising a database. You can regard it as a virtual table or a stored…
Structure Query Language (SQL): Chapter 8 – Triggers.
Triggers are a type of special stored procedures that are executed whenever there is an attempt to change the data in a table protected by them. DML triggers (Data Manipulation…