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36 Cards in this Set
- Front
- Back
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Data is stored within a database using..? |
a table structure
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General categories can be found within..
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columns
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Distinct units of data are contained in..
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rows
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keys
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used to identify distinct entries within a database and are used to access or manipulate rows of data.
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Types of keys used to reference data within a database:
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primary; foreign; secondary; candidate; composite; sort; and alternative.
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What key is required for each row of a table?
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Primary; as it provides tables and are not supported by all DBMSs.
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Can be used to build relationships between tables; and are not supported by all DBMSs.
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Foreign keys
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What act as the intermediary for users and DBMSs?
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Query languages. Provide users a way to retrieve and manipulate data from a database.
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What are the different database models?
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flat; hierarchical; network; and relational.
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The most common relationships formed between tables in a relational database are..?
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one-to-many.
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Databases can be built to handle very active; high-volume query environments such as..
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online transaction processing and POS environments.
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Databases can be built to handle stagnant; low-volume query environments such as..
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historical data warehouse or data support systems.
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Two very important aspects of a DBMS..?
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read consistency and query management.
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Read consistency is dependent on a database's ability to manage ______ and refers to the ____ and _____ of data?
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multiple processes; accuracy; reliability.
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Read consistency is achieved through the use of?
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efficient transaction processing; concurrency handling; and data-locking mechanisms.
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The general query processing steps of a database are..
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parsing; optimization; and execution of a SQL statement. |
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Oracle's architecture has what two main components?
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the instance and the database.
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The instance begins with a user's ______ and includes the ______ _____ and ____ _____ of the application.
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Connection; background processes; memory management.
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The database component involves the ____ file structure?
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physical.
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MySQL's main architectural components include the what?
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connection manager; query engine; and storage management engine.
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The connection manager in MySQL handles what?
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connections to the database.
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The query manager in MySQL processes what?
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SQL statements.
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The storage engine in MySQL manages what for the application?
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memory and storage.
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The main components of SQL Server include what two engines?
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relational and storage.
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The relational engine in SQL Server involves what?
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Query management; threads and processes; and the physical file structure.
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The storage engine in SQL Server includes what?
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buffer and memory management.
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A field with values not chosen as a primary key; but can be used in cases where the primary key is not available.
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alternate key.
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A characteristic or variable that describes or further identifies an entity.
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attribute
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A portion of the SQL Server responsible for accessing data pages and updating the database.
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buffer manager.
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The area where data pages from a database are stored to minimize the need to read and write from the database file located on the hard disk.
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buffer pool/buffer cache
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The process of saving a duplicate of the requested data to another area of a system in hopes of saving resources and speeding up future requests for that same data.
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caching
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A field with values that meet the requirements for a primary key.
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candidate key.
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The component of a table that maintains a general category of information with similar datatypes.
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column/field.
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To make a change within a DBMS that is permanent and visible to other users.
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commit
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A group of two or more fields where their values can be combined to be used as a primary key.
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composite key.
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The simultaneous access of resources and data
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concurrency |
