IFB130 Database Management by Amanda Jarvinen https://padlet.com/amandajarvinen/ifb1302017 Jargon Busting - Database definitions, explanations and relevant resources. en-us 2017-06-25 07:35:18 UTC 2023-01-28 19:48:42 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Diskette.png Database amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363416 A shared collection of logically related data, and a description of this data, designed to meet the information needs of an organization.]]> 2017-06-25 07:39:10 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363416 Database Management System (DBMS) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363435 A software system that enables users to define, create, maintain, and control access to the database.]]> 2017-06-25 07:40:05 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363435 Entity Relationship Diagram (ERD) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363479 A conceptual data model for describing the data or information aspects of an organisation, which lends itself to ultimately being implemented in a database (such as a relational database).]]> 2017-06-25 07:43:09 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363479 Relational Model amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363490 A logical data model, where all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.]]> 2017-06-25 07:43:44 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363490 Normalisation amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363505 The process of normalisation allows us to produce a set of suitable relations that support the data requirements of the use case and minimise redundancy.

]]> 2017-06-25 07:44:23 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363505 Relation (Table, File) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363719 A table with columns and rows. It has the following properties:
  • Has a name that is distinct from all other relation names in the relational schema;
  • Each cell of the relation contains exactly one atomic (single) value;
  • Each attribute has a distinct name;
  • The values of an attribute are all from the same domain;
  • Each tuple is distinct; there are no duplicate tuples;
  • The order of attributes has no significance; and
  • The order of tuples has no significance, theoretically.
]]> 2017-06-25 07:55:03 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363719 Attribute (Column, Field) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363746 A named column of a relation, which describes a property of the corresponding entity or a relationship type.]]> 2017-06-25 07:56:33 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363746 Tuple (Row, Record) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363771  A row of a relation.]]> 2017-06-25 07:57:06 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363771 Domain amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363792 The set of allowable values for one or more attributes]]> 2017-06-25 07:58:15 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363792 Selection amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363811 Operations used to return the tuples of a relation that meet a specific condition (called the predicate)]]> 2017-06-25 07:59:09 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363811 Projection amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/177363898 Operations used to return only specified columns in a relation]]> 2017-06-25 08:03:13 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/177363898 Relational Database Management System(rDBMS) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828533 Term used to refer to a DBMS that uses the relational model. 

]]> 2017-07-17 04:38:10 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828533 Database Application Program amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828582 Computer program that interacts with the database by issuing an appropriate request (typically an SQL statement) to the DBMS.]]> 2017-07-17 04:38:55 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828582 Database System amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828613 Used to define a collection of application programs that interact with the database along with the DBMS and database itself.]]> 2017-07-17 04:39:20 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828613 Data Definition Language (DDL) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828641 Allows users to define a database (e.g. create table, foreign key, constraints, create index). ]]> 2017-07-17 04:39:45 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828641 Data Manipulation Language (DML) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828663 Allows users to insert, update, delete, view and retrieve data from the database. The part of a DML that involves data retrieval is called a query language.]]> 2017-07-17 04:40:04 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828663 ANSI-SPARC (3-level) architecture amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828708 Uses three levels of abstraction: external, conceptual, and internal.]]> 2017-07-17 04:40:38 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828708 External level (ANSI-SPARC architecture) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828741 Consists of the users’ views of the database.]]> 2017-07-17 04:41:02 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828741 Conceptual Level (ANSI-SPARC architecture) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828791 The community view of the database. It specifies the information content of the entire database, independent of storage con- siderations. The conceptual level represents all entities, their attributes, and their relationships, as well as the constraints on the data, and security and integrity information.]]> 2017-07-17 04:41:45 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828791 Internal Level (ANSI-SPARC architecture) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828842 The computer’s view of the database. It specifies how data is represented, how records are sequenced, what indexes and pointers exist, and so on.]]> 2017-07-17 04:42:35 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828842 Database Schema amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828870 Description of the database structure.]]> 2017-07-17 04:42:58 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828870 Data independence amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828894 Makes each level of a database schema immune to changes to lower levels.]]> 2017-07-17 04:43:21 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828894 Logical Data Independence amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828926 The immunity of the external scemas to changes in the conceptual schema.]]> 2017-07-17 04:43:47 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828926 Physical Data Independence amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178828981 The immunity of the conceptual schema to changes in the internal schema.]]> 2017-07-17 04:44:23 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178828981 Data Model amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829055 Collection of concepts that can be used to describe a set of data, the operations to manipulate the data, and a set of integrity constraints for the data.]]> 2017-07-17 04:45:12 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829055 Conceptual Modeling amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829098 The process of constructing a detailed architecture for a database that is independent of implementation details, such as the target DBMS, application programs, programming languages, or any other physical considerations. The design of the conceptual schema is critical to the overall success of the system. It is worth spending the time and energy necessary to produce the best possible conceptual design.]]> 2017-07-17 04:45:32 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829098 Unified Modeling Language (UML) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829150 A general-purpose, developmental, modeling language in the field of software engineering.]]> 2017-07-17 04:45:57 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829150 Entity Type amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829180 A group of objects with the same properties, which are identified by the enterprise as having an independent existence.]]> 2017-07-17 04:46:17 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829180 Entity Occurrence amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829282 A uniquely identifiable object of an entity type.]]> 2017-07-17 04:47:18 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829282 Strong Entity Type amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829308 Entity type that is not existence-dependent on some other entity type. Uniquely identifiable using the primary key attribute.]]> 2017-07-17 04:47:33 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829308 Weak Entity Type amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829347 Entity type that is existence-dependent on some other entity type. Can only identify attributes of weak entity types through relationships with strong entity types.]]> 2017-07-17 04:48:00 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829347 Attribute amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829391 A property of an entity or relationship type.]]> 2017-07-17 04:48:27 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829391 Simple Attribute amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829416 An attribute composed of a single component with an independent existence.]]> 2017-07-17 04:48:47 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829416 Composite Attribute amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829492 An attribute composed of multiple components, each with an independent existence.]]> 2017-07-17 04:49:40 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829492 Single-valued Attribute amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829510 An attribute that holds a single value for each occurrence of an entity type.]]> 2017-07-17 04:49:57 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829510 Multi-valued Attribute amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829520 An attribute that holds multiple values for each occurrence of an entity type.]]> 2017-07-17 04:50:12 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829520 Domain amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829539 An attribute domain is the set of allowable values for one or more attributes.]]> 2017-07-17 04:50:29 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829539 Derived Attribute amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829566 An attribute that represents a value that is derivable from the value of a related attribute or set of attributes, not necessarily in the same entity.]]> 2017-07-17 04:50:50 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829566 Relationship Type amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829615 a set of meaningful associations among entity types. A relationship occurrence is a uniquely identifiable association, which includes one occurrence from each participating entity type.]]> 2017-07-17 04:51:25 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829615 Recursive Relationship amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829634 A relationship type where the same entity type participates more than once in different roles.]]> 2017-07-17 04:51:41 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829634 Multiplicity amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829666 The number (or range) of possible occurrences of an entity type that may relate to a single occurrence of an associated entity type through a particular relationship (e.g. 1..n to n..n).]]> 2017-07-17 04:52:08 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829666 Cardinality amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829685 Describes the maximum number of possible relationship occurrences for an entity participating in a given relationship type (e.g. Many to Many).]]> 2017-07-17 04:52:27 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829685 Degree amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829734 The degree of a relation is the number of attributes it contains.]]> 2017-07-17 04:53:38 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829734 Super Key amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829776 An attribute or set of attributes that uniquely identifies a tuple within a relation.]]> 2017-07-17 04:54:25 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829776 Candidate Key amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829915 Minimal superkey such that no proper subset is a superkey within the relation.]]> 2017-07-17 04:56:24 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829915 Primary Key amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829945 The candidate key that is selected to identify tuples uniquely within the relation.]]> 2017-07-17 04:56:47 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829945 Foreign Key amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829967 An attribute within one relation that matches the candidate key of some (possibly the same) relation.]]> 2017-07-17 04:57:15 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829967 NULL amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178829993 Represents a value for an attribute that is unknown at the present time or is not applicable for this tuple.]]> 2017-07-17 04:57:43 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178829993 Integrity Constraints amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830008 Used to ensure accuracy and consistency of data in a relational database.]]> 2017-07-17 04:58:03 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830008 Entity Integrity Constraint amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830032 Ensures that no attribute of a primary key can be null.]]> 2017-07-17 04:58:26 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830032 Referential Integrity constraint amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830060 Ensures that if a foreign key exists in a relation, either the foreign key value must match a candidate key value of some tuple in its home relation or the foreign key value must be wholly null.]]> 2017-07-17 04:59:07 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830060 View amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830091 A virtual or derived relation that is dynamically created from the under- lying base relation(s) when required.]]> 2017-07-17 04:59:38 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830091 Uniqueness amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830133 The values of an attribute uniquely identify each tuple in a particular relation.]]> 2017-07-17 05:00:23 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830133 Irreducible amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830198 A key is irreducible if no proper subset of the key is unique.

]]> 2017-07-17 05:01:27 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830198 Functional Dependency amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830238 An attribute (A), or set of attributes, is reliant on another (B), and if and only if each A value is associated with precisely one B value. It is written as A → B.]]> 2017-07-17 05:01:52 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830238 Determinant amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830256 The determinant of a dependency refers to the attribute, or group of attributes, on the left-hand side of the arrow.

]]> 2017-07-17 05:02:11 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830256 Fully Functionally Dependent amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830306 An attribute is fully functionally dependent on a set of attributes A if it is both functionally dependent on A, and not functionally dependent on any proper subset of A.]]> 2017-07-17 05:02:43 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830306 Proper subset amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830363 A proper subset of a set of attributes is group of attributes that is contained in the original set of attributes, excludes at least one of the original attributes]]> 2017-07-17 05:03:31 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830363 Partial Dependency amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830387 An attribute is partially dependent if it is a non-key attribute and is functionally dependent on a proper subset of candidate or primary key.]]> 2017-07-17 05:03:50 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830387 Transitive Dependency amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830489 A transitive dependency is an indirect functional dependency, one in which A→C only by virtue of A→B and B→C.]]> 2017-07-17 05:05:18 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830489 Multi-valued Dependency amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830531 A dependency between attributes (for example, A, B, and C) in a relation, such that for each value of A there is a set of values for B and a set of values for C. However, the set of values for B and C are independent of each other.]]> 2017-07-17 05:05:49 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830531 Redundancy amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830560 The state of being not or no longer needed or useful (e.g. data is represented in the database more than once).

Relations with data redundancy suffer from update anomalies, which can be classified as insertion, deletion, and modification anomalies.]]> 2017-07-17 05:06:13 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830560 Normal Form amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830602 A normal form is a defined structure for relational databases in which a relation may not be nested within another relation which have attributes with particular relationships.

]]> 2017-07-17 05:07:03 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830602 0NF (Un-normalised form) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830630 A relation that contains one or more repeating groups (the un-normalised form).]]> 2017-07-17 05:07:22 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830630 Repeating Group amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830672 Set of logically related attributes that occur multiple times in one tuple.]]> 2017-07-17 05:07:51 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830672 1NF amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830714 A relation in which the intersection of each row and column contains one and only one value.]]> 2017-07-17 05:08:15 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830714 2NF amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830721 A relation that is in 1NF and every non-primary-key attribute is fully functionally dependent on the primary key.]]> 2017-07-17 05:08:29 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830721 3NF amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830735 A relation that is in 1NF and 2NF in which no non-primary-key attribute is transitively dependent on the primary key.]]> 2017-07-17 05:08:46 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830735 BCNF (Boyce-Codd Normal Form) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830752 A relation that is in 3NF and every determinant is a candidate key.]]> 2017-07-17 05:09:00 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830752 4NF amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830785 A relation that is in BCNF and does not contain nontrivial multi-valued dependencies.]]> 2017-07-17 05:09:32 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830785 Horizontal Partitioning amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830825 Technique used in denormalisation where tuples of a relation are spread across a number of smaller relations.]]> 2017-07-17 05:10:06 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830825 Relational Algebra amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830856 A (high-level) procedural language: it can be used to tell the DBMS how to build a new relation from one or more relations in the database.]]> 2017-07-17 05:10:45 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830856 Union amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178830899 Produces a relation that contains all tuples of R, or S, or both R and S, duplicate tuples being eliminated. R and S must be union-compatible.]]> 2017-07-17 05:11:35 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178830899 Intersection amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178831330 Produces a relation that contains all the tuples in both R and S. R and S must be union-compatible.]]> 2017-07-17 05:17:51 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178831330 Set Difference amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178831715 Produces a relation that contains all the tuples in R that are not in S. R and S must be union-compatible.]]> 2017-07-17 05:23:25 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178831715 Rename amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/178832148 2017-07-17 05:31:11 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/178832148 Specialisation https://padlet.com/amandajarvinen/ifb1302017/wish/180313614 is the process of maximizing the differences between members of an entity by identifying their distinguishing characteristics.
Ch. 13.1.4 of the Textbook]]> 2017-08-07 23:48:36 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180313614 Generalisation https://padlet.com/amandajarvinen/ifb1302017/wish/180313650 is the process of minimizing the differences between entities by identifying their common characteristics.
Ch. 13.1.5 of the Textbook]]> 2017-08-07 23:49:03 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180313650 Superclass https://padlet.com/amandajarvinen/ifb1302017/wish/180313663 is an entity type that includes one or more distinct subgroupings of  its occurrences, which must be represented in a data model.]]> 2017-08-07 23:49:13 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180313663 Subclass https://padlet.com/amandajarvinen/ifb1302017/wish/180313680 is a distinct subgrouping of occurrences of an entity type, which must be represented in a data model.]]> 2017-08-07 23:49:20 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180313680 Attribute Inheritance https://padlet.com/amandajarvinen/ifb1302017/wish/180313697 An occurrence in a subclass inherits all the attributes of the superclass.]]> 2017-08-07 23:49:28 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180313697 Aggregation https://padlet.com/amandajarvinen/ifb1302017/wish/180313711 Represents a “has-a” or “is-part-of” relationship between entity types, where one represents the “whole” and the other the “part.”
Ch. 13.2 of the Textbook]]> 2017-08-07 23:49:39 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180313711 Composition https://padlet.com/amandajarvinen/ifb1302017/wish/180313724 Is a specific form of aggregation that represents an association between entities, where there is a strong ownership and coincidental lifetime between the “whole” and the “part.]]> 2017-08-07 23:49:50 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180313724 Fan Trap https://padlet.com/amandajarvinen/ifb1302017/wish/180313736 Where a model represents a relationship between entity types, but  the pathway between certain entity occurrences is ambiguous.]]> 2017-08-07 23:49:59 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180313736 Chasm Trap https://padlet.com/amandajarvinen/ifb1302017/wish/180313746 Where a model suggests the existence of a relationship between entity types, but the pathway does not exist between certain entity occurrences. ]]> 2017-08-07 23:50:07 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180313746 Participation Constraint amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/180825665 Determines whether every member in the superclass must participate as a member of a subclass.
Ch. 13.1.6 of the Textbook]]> 2017-08-13 09:10:36 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180825665 Disjoint Constraint amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/180825670 Describes the relationship between members of the subclasses and indicates whether it is possible for a member of a superclass to be a member of one, or more than one, subclass. 
Ch. 13.1.6 of the Textbook]]> 2017-08-13 09:10:49 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180825670 amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/180825755 2017-08-13 09:15:48 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/180825755 Degree amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/182927875 The degree of a relationship type is the number of participating entity types.]]> 2017-08-26 09:43:22 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/182927875 Binary Relationship amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/182927885 2 entity types participate in the relationship.]]> 2017-08-26 09:43:54 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/182927885 Ternary Relationship amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/182927916 3 entity types participate in the relationship.]]> 2017-08-26 09:45:04 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/182927916 Quaternary amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/182927986 4 entity types participate in the relationship.]]> 2017-08-26 09:48:03 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/182927986 SQL amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183078440 SQL stands for Structured Query Language. It is a non-procedural language designed for managing data held in a rDBMS. Whilst SQL is an ANSI standard, there are different versions of the language. SQL acts as both a Data Definition Langauge (DDL) and Data Manipulation Language (DML).]]> 2017-08-28 11:23:33 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183078440 Query amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183079507 A query is a question asked of a database, where a result is returned in the form of a temporary table. All queries begin with the declarative SELECT clause.]]> 2017-08-28 11:32:25 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183079507 SELECT statement amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183079633 SELECT statement is used to express a query. The clause identifies the columns and/or calculated data that will appear in the result table. All column names that appear in the SELECT clause must have their corresponding tables or views listed in the FROM clause.]]> 2017-08-28 11:33:04 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183079633 MySQL Glossary amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183081244 https://dev.mysql.com/doc/refman/5.7/en/glossary.html]]> 2017-08-28 11:42:33 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183081244 w3schools amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183081416 https://www.w3schools.com/sql/default.asp]]> 2017-08-28 11:43:45 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183081416 MySQL Reference Manual amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183081507 https://dev.mysql.com/doc/refman/5.7/en/]]> 2017-08-28 11:44:29 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183081507 WHERE clause amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183081896 selects rows to be included in the result table by applying a search condition to the rows of the named table(s).]]> 2017-08-28 11:46:39 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183081896 Data Control Language (DCL) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183082457 Used to set up privileges and roles.]]> 2017-08-28 11:50:17 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183082457 CREATE amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183082659 Used to create a database object such as a database, table or view.]]> 2017-08-28 11:51:42 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183082659 ALTER amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183082740 Used to alter (modify) an existing database object.]]> 2017-08-28 11:52:21 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183082740 DROP amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183082781 Used to delete (remove) a database object.]]> 2017-08-28 11:52:39 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183082781 Boolean amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183082957 Data type that is used to store True or False values.]]> 2017-08-28 11:53:42 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183082957 CHAR amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183083273 Data type used to store fixed number of characters.]]> 2017-08-28 11:55:32 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183083273 VARCHAR amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183083282 Data type used to store strings with varying numbers of characters.]]> 2017-08-28 11:55:36 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183083282 DECIMAL amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183083821 DECIMAL(p, s). Data type used to store a fixed point number.
 p: maximum number of digits that can be stored.  s: maximum number of digits stored to the right of the decimal point. ]]> 2017-08-28 11:59:42 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183083821 INT amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183083846 Data type used to store a standard integer. Default size is 11 digits in length. ]]> 2017-08-28 11:59:52 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183083846 CHECK Constraint amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183083956 Used to limit the value range that can be placed in a column. It applies to only a single column. NOTE: CHECK constraint is parsed (interpreted by MySQL) but ignored in MySQL 5.7. It is recommended that you use triggers instead.]]> 2017-08-28 12:00:34 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183083956 DEFAULT Constraint amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183084292 The DEFAULT constraint is used to insert a default value into a column. The value will be added to all new rows, if no other value is specified.]]> 2017-08-28 12:02:53 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183084292 UNIQUE Constraint amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183084339 The UNIQUE constraint ensures that all values in the column must be distinct. An error will occur if you try to add a new row with a value that matches an existing row. This constraint can be applied to a combination of columns, in this case some of the columns can contain null values as long as the combination of values is unique. ]]> 2017-08-28 12:03:13 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183084339 NOT NULL Constraint amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183084686 The NOT NULL constraint prevents a column from accepting NULL values. This means that you cannot insert a new row or update a row without adding a value to the NOT NULL field. ]]> 2017-08-28 12:05:17 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183084686 Constraints amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183084748 SQL constraints are used to specify rules for the data in a table. If there is any violation between the constraint and the data action, the action is aborted by the constraint. ]]> 2017-08-28 12:05:44 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183084748 USE amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183084848 Used to explicitly state the database you would like to access. ]]> 2017-08-28 12:06:22 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183084848 DOUBLE amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183085475 DOUBLE(size, d). Data type used to store a large number with a floating decimal point.  The maximum number of digits may be specified in the size parameter. The maximum number of digits to the right of the decimal point is specified in the d parameter. ]]> 2017-08-28 12:09:59 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183085475 DATE amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183085715 Data type used to store a date value in ‘YYYY-MM-DD’ format.]]> 2017-08-28 12:11:27 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183085715 DATETIME amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183085813 Data type used to store date and time value in ‘YYYY-MM-DD HH:MM:SS’ format ]]> 2017-08-28 12:11:57 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183085813 TIME amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183085895 Data type used to store ]]> 2017-08-28 12:12:30 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183085895 TEXT amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183085962 Data type used to store a string with a maximum length of 65,535 characters. ]]> 2017-08-28 12:12:55 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183085962 ENUM amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183086093 Allows you to enter a list of possible values. You can list up to 65535 values in an ENUM list. If a value is inserted that is not in the list, a blank value will be inserted. ]]> 2017-08-28 12:13:42 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183086093 ON UPDATE RESTRICT amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183087842 Referential action. Rejects the update operation for the parent table. This is the default action and is the same as omitting the ON UPDATE clause. ]]> 2017-08-28 12:22:49 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183087842 ON UPDATE CASCADE amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183087924 Referential action. Update the row from the parent table, and automatically update the matching rows in the child table.]]> 2017-08-28 12:23:14 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183087924 ON UPDATE SET NULL amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183087992 Referential action. Update the row from the parent table, and set the foreign key column or columns in the child table to NULL.]]> 2017-08-28 12:23:38 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183087992 ON UPDATE NO ACTION amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183088041 Referential action. This is the same as using ON UPDATE RESTRICT in MySQL. ]]> 2017-08-28 12:23:54 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183088041 ON DELETE RESTRICT amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183088114 Referential action. Rejects the delete operation for the parent table. This is the default action and is the same as omitting the ON DELETE clause. ]]> 2017-08-28 12:24:20 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183088114 ON DELETE CASCADE amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183088207 Referential action. Delete the row from the parent table, and automatically delete the matching rows in the child table. ]]> 2017-08-28 12:24:43 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183088207 ON DELETE SET NULL amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183088270 Referential action. Delete the row from the parent table, and set the foreign key column or columns in the child table to NULL.]]> 2017-08-28 12:24:59 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183088270 ON DELETE NO ACTION amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183088347 Referential action. This is the same as using ON DELETE RESTRICT in MySQL. ]]> 2017-08-28 12:25:18 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183088347 DESCRIBE amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183088539 The DESCRIBE and EXPLAIN statements are synonyms, used either to obtain information about table structure or query execution plans.

]]> 2017-08-28 12:26:04 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183088539 SHOW amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183088594 SHOW has many forms that provide information about databases, tables, columns, or status information about the server. 

]]> 2017-08-28 12:26:18 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183088594 INSERT amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183088648 INSERT inserts new rows into an existing table.]]> 2017-08-28 12:26:32 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183088648 INDEX amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183089608 An index is a structure that is created for fast data retrievals in a query. By default an index will always be created on primary key columns. You can create additional indexes on other table columns using CREATE INDEX command. Indexes slow down database operations so care is needed in creating indexes.]]> 2017-08-28 12:30:43 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183089608 VIEW amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183089777 Virtual table that does not necessarily actually exist in the database but is produced upon request, at time of request ]]> 2017-08-28 12:31:33 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183089777 AUTO_INCREMENT amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183090033 Auto increment is a DBMS specific mechanism. The AUTO_INCREMENT attribute can be used to generate a unique identity for new rows. The value of the column is inserted automatically every time a new record is inserted. ]]> 2017-08-28 12:32:31 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183090033 DELETE amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/183091339 Use Delete command to delete rows from a table. ]]> 2017-08-28 12:39:01 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/183091339 INNER JOIN amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/192895216 Selects records that have matching values in both tables.]]> 2017-10-02 08:55:12 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/192895216 LEFT (outer) JOIN amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/192897531 The LEFT JOIN keyword returns all records from the left table (table1), and the matched records from the right table (table2). The result is NULL from the right side, if there is no match.]]> 2017-10-02 09:04:27 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/192897531 RIGHT (outer) JOIN amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/192897657 The RIGHT JOIN keyword returns all records from the right table (table2), and the matched records from the left table (table1). The result is NULL from the left side, when there is no match.]]> 2017-10-02 09:05:02 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/192897657 The New Boston MySQL Beginners Tutorial amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/192899416 https://thenewboston.com/videos.php?cat=49&video=18983]]> 2017-10-02 09:12:33 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/192899416 Relational Algebra Cheat Sheet amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/192899812 For the full(er) list of relational algebra operations please refer to the attached cheat sheet.]]> 2017-10-02 09:14:17 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/192899812 Database security amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234638 The mechanisms that protect the database against intentional or accidental threats.]]> 2017-10-21 02:24:57 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234638 Threats amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234731 Any situation or event, whether intentional or accidental, that may adversely affect a system and consequently the organization.

]]> 2017-10-21 02:27:02 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234731 Authorisation amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234743 The granting of a right or privilege that enables a subject to have legitimate access to a system or a system’s object.]]> 2017-10-21 02:27:25 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234743 Authentication amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234749 A mechanism that determines whether a user is who he or she claims to be.]]> 2017-10-21 02:27:40 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234749 View amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234765 A view is the dynamic result of one or more relational operations operating on the base relations to produce another relation. A view is a  virtual relation that does not actually exist in the database, but is produced upon request by a particular user, at the time of request.]]> 2017-10-21 02:28:03 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234765 Backup amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234786 The process of periodically copying of the database and log file (and possibly programs) to offline storage media.

]]> 2017-10-21 02:28:18 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234786 Journaling amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234792 The process of keeping and maintaining a log file (or journal) of all changes made to the database to enable recovery to be undertaken effectively in the event of a failure.]]> 2017-10-21 02:28:30 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234792 Encryption amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234809 The encoding of the data by a special algorithm that renders the data unreadable by any program without the decryption key]]> 2017-10-21 02:28:52 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234809 RAID amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234816 Redundant Array of Independent Disks
Provides fault-tolerant mechanism, meaning that the DBMS should continue to operate even if one of the hardware components fails]]> 2017-10-21 02:29:12 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234816 Data administration amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234898 The management of the data resource, which includes database planning, development, and maintenance of standards, policies and procedures, and conceptual and logical database design.]]> 2017-10-21 02:32:05 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234898 Database administration amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234909 The management of the physical realization of a database system, which includes physical database design and implementation, setting security and integrity controls, monitoring system performance, and reorganizing the database, as necessary.]]> 2017-10-21 02:32:24 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234909 Integrity constraints (security) amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199234972 Contribute to maintaining a secure database system by preventing data from becoming invalid, and hence giving misleading or incorrect results.]]> 2017-10-21 02:34:06 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199234972 Transaction amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235825 An action, or series of actions, carried out by a single user or application program, that reads or updates the contents of the database. Treated as a logical unit of work on the database. Transactions can terminate successfully (commit) or unsuccessfully (abort). Aborted transactions must be undone or rolled back. The transaction is also the unit of concurrency and the unit of recovery.]]> 2017-10-21 02:57:42 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235825 Concurrency control amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235838 The process of managing simultaneous operations on the database without having them interfere with one another.]]> 2017-10-21 02:57:59 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235838 Recovery amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235847 The process of restoring the database to a correct state in the event of a failure.]]> 2017-10-21 02:58:19 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235847 Fault Tolerance amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235870 Resilient to system crashes due to hardware or software failures]]> 2017-10-21 02:59:08 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235870 Lost update amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235895 an apparently successful completed update by one user can be overridden by another user.
Concurrency Problem.]]> 2017-10-21 02:59:48 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235895 Uncommitted dependency amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235918 One transaction is allowed to see intermediate results of another transaction before it has committed.
Concurrency Problem.]]> 2017-10-21 03:00:24 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235918 Inconsistent Analysis amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235932 a transaction reads several values from the DB but a second transaction updates some of them during the execution of the first.
Concurrency Problem.]]> 2017-10-21 03:00:53 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235932 COMMIT amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235962 Command used to permanently save any transaction into database ]]> 2017-10-21 03:01:43 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235962 ROLLBACK amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235976 Command used to restore the database to the last committed state.]]> 2017-10-21 03:02:03 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235976 Savepoint amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199235993 Command used to temporarily save a transaction so that you can rollback to that point whenever necessary.]]> 2017-10-21 03:02:26 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199235993 ACID amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199236032 Properties of Transactions
Atomicity
Consistency
Isolation
Durability]]> 2017-10-21 03:03:10 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199236032 Atomicity amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199236052 All-or-nothing property:  a transaction is an indivisible unit  of work.]]> 2017-10-21 03:03:43 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199236052 Consistency amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199236071 A transaction must transform the DB from one consistent state to another. DB can ensure consistency by enforcing relational model constrains (e.g. integrity and referential constrains)]]> 2017-10-21 03:04:19 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199236071 Isolation amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199236081 • In process transaction remains isolated from any other transaction.
• One transaction cannot read data from another uncommitted transaction.
• Implemented  by Serialisability (transactions are executed interleaved, but should be equivalent to serial (sequential) execution)
• Serialisability identifies those executions of transactions guaranteed to ensure consistency
]]> 2017-10-21 03:04:39 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199236081 Durability amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199236138 –effects of a successful committed transaction are permanently recorded in the DB and must not be loss  because of a subsequent failure
–A guarantee that DB will be recovered even after a crash, regardless of which transaction was in queue, commit, store or rollback
]]> 2017-10-21 03:06:35 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199236138 Complex Relationship amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199237455 3 or more entities participate in the relationship.]]> 2017-10-21 03:39:04 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199237455 Relational Algebra amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199237512 2017-10-21 03:40:40 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199237512 Regular Expressions amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199237536 2017-10-21 03:41:04 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199237536 Basic MySQL amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199237666 https://gist.github.com/hofmannsven/9164408]]> 2017-10-21 03:44:23 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199237666 MySQL Wiki amandajarvinen https://padlet.com/amandajarvinen/ifb1302017/wish/199237696 https://en.wikibooks.org/wiki/MySQL/CheatSheet]]> 2017-10-21 03:45:05 UTC https://padlet.com/amandajarvinen/ifb1302017/wish/199237696