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ERD Symbols and Meanings

ERD Symbols and Meanings
Entity Relationship Diagram (ERD) is a popular software engineering tool for database modeling and illustration the logical structure of databases, which uses one of two notations - Chen's or Crow’s Foot. Crow's foot notation is effective when used in software engineering, information engineering, structured systems analysis and design. Each of these notations applies its own set of ERD symbols. Crow's foot diagrams use boxes to represent entities and lines between these boxes to show relationships. Varied shapes at the ends of lines depict the cardinality of a given relationship. Chen's ERD notation is more detailed way to represent entities and relationships. ConceptDraw DIAGRAM application enhanced with all-inclusive Entity-Relationship Diagram (ERD) solution allows design professional ER diagrams with Chen's or Crow’s Foot notation on your choice. It contains the full set of ready-to-use standardized ERD symbols and meanings helpful for quickly drawing, collection of predesigned ERD samples, examples and templates. ConceptDraw Pro is a great alternative to Visio for Mac users as it offers more features and can easily handle the most demanding professional needs.
How to Build an Entity Relationship Diagram (ERD)
How to Build an Entity Relationship Diagram (ERD)
The vector stencils library "Rack diagrams" contains 55 hardware symbols for creating the server rack layout diagrams using the ConceptDraw PRO diagramming and vector drawing software.
"A 19-inch rack is a standardized frame or enclosure for mounting multiple equipment modules. Each module has a front panel that is 19 inches wide, including edges or ears that protrude on each side which allow the module to be fastened to the rack frame with screws. Equipment designed to be placed in a rack is typically described as rack-mount, rack-mount instrument, a rack mounted system, a rack mount chassis, subrack, rack mountable, or occasionally simply shelf. The industry standard rack cabinet is 42U tall." [19-inch rack. Wikipedia]
"A rack unit, U or RU is a unit of measure that describes the height of equipment designed to mount in a 19-inch rack or a 23-inch rack. The size of a piece of rack-mounted equipment is frequently described as a number in "U". For example, one rack unit is often referred to as "1U", 2 rack units as "2U" and so on.
A typical full size rack is 42U, which means it holds just over 6 feet of equipment, and a typical "half-height" rack would be 18-22U, or around 3 feet high." [Rack unit. Wikipedia]
The example "Design elements - Rack diagram" is included in the Rack Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.
Rack diagram elements
Rack diagram elements, single rack rail, rack unit, rack rails, half-rack, rack rails, patch panel, managed UPS, fiber optic patch panel, Xserve RAID, Apple Xserve Raid 3U, XServe, Apple XServe 1U, UPS, rackmount UPS, LCD monitor keyboard, KVM, Cisco switch, WS-C3560-48TS-S, Cisco switch, WS-C3560-24PS-S, Cisco switch, WS-C2960-48TT-L, Cisco switch, WS-C2960-48TC-L, Cisco switch, WS-C2960-24TT-L, Cisco switch, WS-C2960-24TC-L, 8U rackmount LCD monitor, 8U rack LCD display, 7U rackmount LCD monitor, 4U server, 3U server, 3U RAID array, 2U server, 2U ethernet switch hub, 2U RAID array, 1U tray, 1U spacer, 1U server, 1U power strip, 1U ethernet switch hub, 1U cable management bar, 1U KVM switch, 19 inch rack,
Used Solutions

Entity-Relationship Diagram (ERD) with ConceptDraw DIAGRAM

Entity-Relationship Diagram (ERD) is applied for detailed description of structures and high-level (conceptual) design databases using the Chen's and Crow's Foot notations. An ERD represents a diagram constructed mainly of rectangular blocks (for entities, data) linked with relationships. The links between the blocks are used to describe relations between the entities. There are three types of relationships: one-to-one, one-to-many, and many-to-many. Use the specialized ERD software - ConceptDraw DIAGRAM to create the Entity-Relationship Diagrams (ERDs) of any degree of complexity with Chen's and Crow's Foot notations. Draw them easily applying the powerful built-in tools and libraries of predesigned ERD vector objects from Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park. You can also start with one of ready template or sample included to this solution. Designing the ERDs in ConceptDraw DIAGRAM you can easy move the objects within a diagram with saving the relationships between them.
How to Build an Entity Relationship Diagram (ERD)
How to Build an Entity Relationship Diagram (ERD)