Data files
... • Databases contain information about objects that exist in the real world • The first step in designing a database is to determine which objects to represent within the database and which properties to include • This process is called data modelling • The purpose of a data model is to create a logi ...
... • Databases contain information about objects that exist in the real world • The first step in designing a database is to determine which objects to represent within the database and which properties to include • This process is called data modelling • The purpose of a data model is to create a logi ...
An approach to successful online transaction processing applications
... In online transaction processing, large databases are concurrently accessed and updated by a large number of online users. Examples of transaction processing applications are provided in Figure 1. As shown in Figure 2, there are three levels by which the nature of transactions may be defined. 1. A b ...
... In online transaction processing, large databases are concurrently accessed and updated by a large number of online users. Examples of transaction processing applications are provided in Figure 1. As shown in Figure 2, there are three levels by which the nature of transactions may be defined. 1. A b ...
Chapter 2. Some tools for building and querying annotated speech
... interface to the Emu query language from within the Emu Query Tool. It is shown how each simple query is entered in the interface so that the complex query can be calculated from the system. Subsequently, the database is searched and the result is shown. A segment is opened with the Emu labelling to ...
... interface to the Emu query language from within the Emu Query Tool. It is shown how each simple query is entered in the interface so that the complex query can be calculated from the system. Subsequently, the database is searched and the result is shown. A segment is opened with the Emu labelling to ...
ch02
... The Relational Model (cont’d.) Relational data management system (RDBMS) Performs same functions provided by hierarchical model Hides complexity from the user Relational diagram Representation of entities, attributes, and relationships Relational table stores collection of related entit ...
... The Relational Model (cont’d.) Relational data management system (RDBMS) Performs same functions provided by hierarchical model Hides complexity from the user Relational diagram Representation of entities, attributes, and relationships Relational table stores collection of related entit ...
Overview of Import from Excel Spreadsheets
... number. Example 0000-PT-8202. This process could also be automated in Excel so the user would not have to enter these values. ...
... number. Example 0000-PT-8202. This process could also be automated in Excel so the user would not have to enter these values. ...
SQL 1. What are the types of SQL statement? Data Manipulation
... When you create a sequence with CYCLE option, you are saying that when the sequence reaches its MAXVALUE, it will start over at the MINVALUE. This is not wise if using the sequence for primary key creation. When you create a sequence with NOCYCLE option, you are saying that when the sequence reaches ...
... When you create a sequence with CYCLE option, you are saying that when the sequence reaches its MAXVALUE, it will start over at the MINVALUE. This is not wise if using the sequence for primary key creation. When you create a sequence with NOCYCLE option, you are saying that when the sequence reaches ...
07_01_Boeing - Systems and Information Engineering
... Figure 4: Flow Diagram for Creating Instructions Pictures can be taken with a digital camera and stored as either .gif or .jpeg files. These pictures can be edited with Microsoft Photoshop in order to mark-up the pictures. Editing the picture will allow the ME to highlight certain parts of the pictu ...
... Figure 4: Flow Diagram for Creating Instructions Pictures can be taken with a digital camera and stored as either .gif or .jpeg files. These pictures can be edited with Microsoft Photoshop in order to mark-up the pictures. Editing the picture will allow the ME to highlight certain parts of the pictu ...
nov10
... values. Has the same effect as “or” – Select * from Employee where Location in (“Dublin”, “Chicago”); ...
... values. Has the same effect as “or” – Select * from Employee where Location in (“Dublin”, “Chicago”); ...
More SQL – Insert, Update, and Delete
... Update, and Delete. We have used Select before. A brief description of the other three follows. Instead of stmt.executeQuery (query), these three use stmt.executeUpdate (query). Also, the method, executeUpdate returns an integer value. If the update is successful, the method returns the number of ro ...
... Update, and Delete. We have used Select before. A brief description of the other three follows. Instead of stmt.executeQuery (query), these three use stmt.executeUpdate (query). Also, the method, executeUpdate returns an integer value. If the update is successful, the method returns the number of ro ...
VBFC8 - University of Wolverhampton
... If want to relate the data from two tables together: Tables must be in same database, and have a common field to relate Use a query to create the relationship Queries are written using SQL, structured query language Complex language, but some databases e.g. MSAccess allow you to build queries ...
... If want to relate the data from two tables together: Tables must be in same database, and have a common field to relate Use a query to create the relationship Queries are written using SQL, structured query language Complex language, but some databases e.g. MSAccess allow you to build queries ...
Creating Databases
... – Estimate the number of buffers by determining the number of blocks each application accesses at one time (include data, index, and rollback segment blocks) – High values enable larger cache, which may reduce I/O • If set too high, the SGA may be larger than physical memory and lead to swapping, an ...
... – Estimate the number of buffers by determining the number of blocks each application accesses at one time (include data, index, and rollback segment blocks) – High values enable larger cache, which may reduce I/O • If set too high, the SGA may be larger than physical memory and lead to swapping, an ...
The Complete Guide to Securing Amazon RDS
... structure as well as the raw data retrieved (however, the data retrieved is not stored anywhere). The key purpose of this scan is to quickly determine which location is considered "sensitive". In addition, it is possible for IT and security teams to generate all the auditing and masking rules manual ...
... structure as well as the raw data retrieved (however, the data retrieved is not stored anywhere). The key purpose of this scan is to quickly determine which location is considered "sensitive". In addition, it is possible for IT and security teams to generate all the auditing and masking rules manual ...
Database System Architectures
... Implementation Issues for Distributed Databases Atomicity needed even for transactions that update data at multiple sites The two-phase commit protocol (2PC) is used to ensure atomicity ...
... Implementation Issues for Distributed Databases Atomicity needed even for transactions that update data at multiple sites The two-phase commit protocol (2PC) is used to ensure atomicity ...
Distributed and Non-Relational Databases
... database transactions may take place, and has been a mainstay in modern relational database systems. Atomicity simply means that each transaction is all-or-nothing. If any operation in the transaction group fails, then the entire transaction must be undone. If one were to insert a million rows into ...
... database transactions may take place, and has been a mainstay in modern relational database systems. Atomicity simply means that each transaction is all-or-nothing. If any operation in the transaction group fails, then the entire transaction must be undone. If one were to insert a million rows into ...
Chapter 1 Relational Database Fundamentals
... know exactly where and how the file stores its data. Thus, for small systems, flat files work fine. The larger a system is, however, the more cumbersome a flat file system becomes. Using a database instead of a flat file system eliminates duplication of effort. Although database files themselves may ...
... know exactly where and how the file stores its data. Thus, for small systems, flat files work fine. The larger a system is, however, the more cumbersome a flat file system becomes. Using a database instead of a flat file system eliminates duplication of effort. Although database files themselves may ...
Lawson Add-Ins
... understanding of the form and application to which they are uploading data. Data must be entered correctly in the Upload Wizard to preserve the integrity of data in the database.” “The Upload Wizard cannot perform some Lawson transactions. For example, you cannot use the Upload feature to do a Relea ...
... understanding of the form and application to which they are uploading data. Data must be entered correctly in the Upload Wizard to preserve the integrity of data in the database.” “The Upload Wizard cannot perform some Lawson transactions. For example, you cannot use the Upload feature to do a Relea ...
Relational Calculus
... It is known that every query that can be expressed in relational algebra can be expressed as a safe query in DRC / TRC; the converse is also true. Relational Completeness: Query language (e.g., SQL) can express every query that is expressible in relational algebra/calculus. ...
... It is known that every query that can be expressed in relational algebra can be expressed as a safe query in DRC / TRC; the converse is also true. Relational Completeness: Query language (e.g., SQL) can express every query that is expressible in relational algebra/calculus. ...
CIS 338: Printing
... various options allow you to modify previous choices Report Options allows you to set NULL values to defaults ...
... various options allow you to modify previous choices Report Options allows you to set NULL values to defaults ...
Database Systems - a.thanop somprasong
... Centralized database: data located at a single site Distributed database: data distributed across several different sites ...
... Centralized database: data located at a single site Distributed database: data distributed across several different sites ...
Chapter 9
... Involves filtering out or repairing invalid data prior to being stored in the warehouse Operational data are “dirty” for many reasons: clerical, data entry, computer program errors, misspelled names, and blank fields. ...
... Involves filtering out or repairing invalid data prior to being stored in the warehouse Operational data are “dirty” for many reasons: clerical, data entry, computer program errors, misspelled names, and blank fields. ...
parallel
... Selection may not require all sites for range or hash partitioning. Indexes can be built at each partition. Question: How do indexes differ in the different schemes? Think about both lookups and inserts! ...
... Selection may not require all sites for range or hash partitioning. Indexes can be built at each partition. Question: How do indexes differ in the different schemes? Think about both lookups and inserts! ...
PowerPoint Template - Uttaradit Rajabhat University
... Semicolon is the standard way to separate each SQL statement in database systems that allow more than one SQL statement to be executed in the same call to the server. We are using Oracle and we do not have to put or have to put a semicolon after each SQL statement, but some database programs force y ...
... Semicolon is the standard way to separate each SQL statement in database systems that allow more than one SQL statement to be executed in the same call to the server. We are using Oracle and we do not have to put or have to put a semicolon after each SQL statement, but some database programs force y ...
P*TIME
... Dynamic selection of field-level or record-level logging represents the degree of P*TIME optimization for log volume minimization. Even for the same logging granularity, differential logging stores the XOR difference between “before” and “after” images and thus reduces the log volume by almost half ...
... Dynamic selection of field-level or record-level logging represents the degree of P*TIME optimization for log volume minimization. Even for the same logging granularity, differential logging stores the XOR difference between “before” and “after” images and thus reduces the log volume by almost half ...
Microsoft Jet Database Engine
The Microsoft Jet Database Engine is a database engine on which several Microsoft products have been built. A database engine is the underlying component of a database, a collection of information stored on a computer in a systematic way. The first version of Jet was developed in 1992, consisting of three modules which could be used to manipulate a database.Database connect for MicrosoftJET stands for Joint Engine Technology, sometimes being referred to as Microsoft JET Engine or simply Jet. Microsoft Access and Visual Basic use or have used Jet as their underlying database engine. It has since been superseded for general use, however, first by Microsoft Desktop Engine (MSDE), then later by SQL Server Express. For larger database needs, Jet databases can be upgraded (or, in Microsoft parlance, ""up-sized"") to Microsoft's flagship database product, SQL Server.However, this does not mean that a MS Jet (Red) database cannot match MS SQL Server in storage capacity. A 5 billion record MS Jet (Red) database with compression and encryption turned on requires about 1 terabyte of disk storage space, comprising hundreds of (*.mdb) files, each acting as partial table, and not as a database in itself.Over the years, Jet has become almost synonymous with Microsoft Access, to the extent that many people refer to a Jet database as an ""Access database"".