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PHP_Part2
PHP_Part2

...  MySQL is a database. A database is integrated collection of data.  The data in MySQL is stored in database objects called tables.  A table is a collections of related data entries and it consists of columns and rows.  Databases are useful when storing information categorically. A company may ha ...
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... Pyrrho is a rigorously developed relational database management system that can run on small computers, even mobile phones, but can also scale up to large enterprise uses. It assumes the .NET framework. For large databases it needs a lot of main memory (RAM). For best results the computer main memor ...
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... The Purpose of Redo Log Files • Purpose: aid in database recovery – Redo log files keep list of DB changes – If DB loses changes, recovery process restores them – Redo log files receive the change information before the datafiles are updated – In minor failures (e.g., short power outage), redo log ...
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... arbitrary symbolic object names to manage new complex object values de ned in their logical queries (Kuper and Vardi, 1984; Kuper and Vardi, 1993). The concept of object name is a re nement of Codd's notion of surrogate (Codd, 1979); nowadays, we use the term object identity. The mechanism of value ...
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... The best way for students to understand SQL is by using it. Have your students work through the Review Questions, Project Questions and the Marcia’s Dry Cleaning and Morgan Importing Project Questions in an actual database. Students can create databases in Microsoft Access with basic tables, relatio ...
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... Database management systems will continue to manage large data volumes. Thus, efficient algorithms for accessing and manipulating large sets and sequences will be required to provide acceptable performance. The advent of object-oriented and extensible database systems will not solve this problem. On ...
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... If you update the database links module properties and set the user and/or password in lower case or mix of lower and upper case, the generated database link contains user and/or password in quoted lower or mixed case, and may result in ORA-00942. Configuration of database links (or registration of ...
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... More Weak Entity Set Examples  In a university, a course is a strong entity and a course-offering can be modeled as a weak entity  The discriminator of course-offering would be semester (including year) and section-number (if there is more than one section)  If we model course-offering as a stro ...
Chapter15
Chapter15

... • The entities of the table are represented as rows • Rows and columns are unordered in databases • Tables and fields should have names that describe their contents • Fields must be atomic • One or more attributes define the primary key Copyright © 2013 Pearson Education, Inc. Publishing as Pearson ...
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Database model



A database model is a type of data model that determines the logical structure of a database and fundamentally determines in which manner data can be stored, organized, and manipulated. The most popular example of a database model is the relational model, which uses a table-based format.
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