13.1 Relational Databases
... • The relational model is currently the most popular model • Data is stored in tables • Columns are named • Each row contains values for each column, though some values may be missing • Rows are referred to as entities • The primary key is one or more columns in a table whose value(s) uniquely ...
... • The relational model is currently the most popular model • Data is stored in tables • Columns are named • Each row contains values for each column, though some values may be missing • Rows are referred to as entities • The primary key is one or more columns in a table whose value(s) uniquely ...
title
... – Keyword: P1 Performance (of the Primary Db) over data protect. It requires ASYNC redo transport, the LGWR process never waits for acknowledgment from the Standby database. ▶ Maximum Availability – Keyword: P1 = Availability: Zero data loss protect as a very close P2. It requires SYNC redo transpor ...
... – Keyword: P1 Performance (of the Primary Db) over data protect. It requires ASYNC redo transport, the LGWR process never waits for acknowledgment from the Standby database. ▶ Maximum Availability – Keyword: P1 = Availability: Zero data loss protect as a very close P2. It requires SYNC redo transpor ...
MYCH4
... Division in General Let A have 2 fields, x and y; B have only field y: A/B = {x: for all y in B. the tuple xy is in A}. i.e., A/B contains all x tuples (sailors) such that for every y tuple (boat) in B, there is an xy tuple in A. Or: If the set of y values (boats) associated with an x value ( ...
... Division in General Let A have 2 fields, x and y; B have only field y: A/B = {x: for all y in B. the tuple xy is in A}. i.e., A/B contains all x tuples (sailors) such that for every y tuple (boat) in B, there is an xy tuple in A. Or: If the set of y values (boats) associated with an x value ( ...
Database Reorganization
... (e.g., CODASYL record, IMS segment, CODASYL set, or IMS hierarchy). 2) Change the database description among two groups of fields in a single record type, two record types related as parent (OWNER in CODASYL) and child {MEMB E R in CODASYL), and three record types related as parent, child, and paren ...
... (e.g., CODASYL record, IMS segment, CODASYL set, or IMS hierarchy). 2) Change the database description among two groups of fields in a single record type, two record types related as parent (OWNER in CODASYL) and child {MEMB E R in CODASYL), and three record types related as parent, child, and paren ...
Week 13 - Pravin Shetty > Resume
... There are several types of keys : 1. A candidate key - this is one of the ‘possible’ keys in a table. A an example, a motor car has a Registered Number, and also a Vehicle identification Number (VIN). 2. A surrogate key is a key with no meaning in itself. They are normally generated by the database ...
... There are several types of keys : 1. A candidate key - this is one of the ‘possible’ keys in a table. A an example, a motor car has a Registered Number, and also a Vehicle identification Number (VIN). 2. A surrogate key is a key with no meaning in itself. They are normally generated by the database ...
4020-Lecture5_6
... A violation of referential integrity would happen if an order was entered in the order table for a Cust. ID that had not been entered into the customer table first An RDBMS prevents such a record from being entered ...
... A violation of referential integrity would happen if an order was entered in the order table for a Cust. ID that had not been entered into the customer table first An RDBMS prevents such a record from being entered ...
Database Integrity: Security, Reliability, and Performance
... This philosophy has changed since version 5.0 to give an administrator an additional tool to specify an “sql_mode” variable which can choose server-enforced data integrity. The database will then validate incoming data and reject data that is the wrong datatype or data that violates basic integrity ...
... This philosophy has changed since version 5.0 to give an administrator an additional tool to specify an “sql_mode” variable which can choose server-enforced data integrity. The database will then validate incoming data and reject data that is the wrong datatype or data that violates basic integrity ...
Database Backup and Recovery
... • The DBA must decide how many complete generations of backups (for both database object copies and log copies) to keep. • Keeping extra generations can help you recover from a media failure during recovery by switching to an older backup. – At a minimum, the retention period should be at least ...
... • The DBA must decide how many complete generations of backups (for both database object copies and log copies) to keep. • Keeping extra generations can help you recover from a media failure during recovery by switching to an older backup. – At a minimum, the retention period should be at least ...
Extending Mandatory Access Control Policies in Android
... database engine. It offers high storage efficiency and small memory footprint. A SQLite database is represented by a single disk file and anyone who has direct access to the file can read the whole database content. Usually, due to the fact that SQLite has no separate server, the entire database eng ...
... database engine. It offers high storage efficiency and small memory footprint. A SQLite database is represented by a single disk file and anyone who has direct access to the file can read the whole database content. Usually, due to the fact that SQLite has no separate server, the entire database eng ...
Web Development Basics - Homework
... © Software University Foundation (softuni.org). This work is licensed under the CC-BY-NC-SA license. Follow us: ...
... © Software University Foundation (softuni.org). This work is licensed under the CC-BY-NC-SA license. Follow us: ...
select
... NOTE: SQL does not permit the ‘-’ character in names, so you would use, for example, branch_name instead of branch-name in a real implementation. NOTE: SQL names are case insensitive ...
... NOTE: SQL does not permit the ‘-’ character in names, so you would use, for example, branch_name instead of branch-name in a real implementation. NOTE: SQL names are case insensitive ...
Here
... • DESIGN: Is it a good fit for your DBMS? Does your DBMS match your existing hardware and software? • ISOLATION: Disciplined separation of development from ...
... • DESIGN: Is it a good fit for your DBMS? Does your DBMS match your existing hardware and software? • ISOLATION: Disciplined separation of development from ...
Analytical Processing
... Multidimensional SQL operators are implemented inefficiently. SQL queries like the one above are very expensive and cannot be executed in real time for even the smallest data sets. In most relational database systems, ROLLUP operations are implemented by splitting the query into several smaller unit ...
... Multidimensional SQL operators are implemented inefficiently. SQL queries like the one above are very expensive and cannot be executed in real time for even the smallest data sets. In most relational database systems, ROLLUP operations are implemented by splitting the query into several smaller unit ...
Rule 30(b)(6) Deposition Question Topics
... o Describe the electronic mail backup software program(s) used (e.g., ARCserve, Backup Exec, etc.). o Is the backup a full backup or a brick level backup? o How frequently are electronic mail backups performed (daily, weekly, monthly)? o Is the electronic mail backup process automated? o Describe th ...
... o Describe the electronic mail backup software program(s) used (e.g., ARCserve, Backup Exec, etc.). o Is the backup a full backup or a brick level backup? o How frequently are electronic mail backups performed (daily, weekly, monthly)? o Is the electronic mail backup process automated? o Describe th ...
One-Copy Serializability with Snapshot Isolation under
... The main contributions of this work are the following: • We propose SGSI, a novel concurrency control algorithm for replicated databases with SI replicas. SGSI ensures 1SR, an isolation level stronger than the level of individual components. We formally prove SGSI correctness; • We are the first to ...
... The main contributions of this work are the following: • We propose SGSI, a novel concurrency control algorithm for replicated databases with SI replicas. SGSI ensures 1SR, an isolation level stronger than the level of individual components. We formally prove SGSI correctness; • We are the first to ...
2. Creating a database Designing the database schema
... to query data) – surely it’s much easier just to type data in an Access datasheet? It is worth learning the SQL way, though. If you know SQL you can work the same way with any RDBMS. Also, a database may be part of an enterprise application, and the data may be insert ...
... to query data) – surely it’s much easier just to type data in an Access datasheet? It is worth learning the SQL way, though. If you know SQL you can work the same way with any RDBMS. Also, a database may be part of an enterprise application, and the data may be insert ...
Access 2010: database tasks Page 1 of 14 Access 2010 Help
... Access. Moreover, list data is stored on a server, which generally offers better protection against data loss than files stored on a desktop computer. You can either start with a new list, or you can link to an existing list. You must have sufficient permissions on the SharePoint site where you want ...
... Access. Moreover, list data is stored on a server, which generally offers better protection against data loss than files stored on a desktop computer. You can either start with a new list, or you can link to an existing list. You must have sufficient permissions on the SharePoint site where you want ...
An FP Tree based Approach for Extracting Frequent Pattern from
... transaction. In comparison with Apriori algorithm FP is much superior in case of efficiency. But problem with traditional FP is that it produces a huge number of conditional FP-Tree [14]. Divide-and-conquer technique is used to decompose the mining task into a set of smaller tasks for mining confine ...
... transaction. In comparison with Apriori algorithm FP is much superior in case of efficiency. But problem with traditional FP is that it produces a huge number of conditional FP-Tree [14]. Divide-and-conquer technique is used to decompose the mining task into a set of smaller tasks for mining confine ...
Oracle Database 10g: Administration Workshop I
... Dynamic Performance Views Dynamic performance views provide access to ...
... Dynamic Performance Views Dynamic performance views provide access to ...
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"".