Applications of the Join Operation in the REA Data Model
... formed consisting of the combination of each record with all records of the same table. The selection of the records that takes place next is based on the data field(s) and the join condition using any of the θ operators. The self-join is performed when the relationship between records on a set of s ...
... formed consisting of the combination of each record with all records of the same table. The selection of the records that takes place next is based on the data field(s) and the join condition using any of the θ operators. The self-join is performed when the relationship between records on a set of s ...
ppt
... This occurs when one transaction updates a database item and then the transaction fails for some reason. The updated item is accessed by another transaction before it is changed back to its original value. ...
... This occurs when one transaction updates a database item and then the transaction fails for some reason. The updated item is accessed by another transaction before it is changed back to its original value. ...
High-Performance Data Access with FedSQL and DS2
... data integration, a concept known as data federation. In this situation the query engine must be capable of decomposing the query into sub queries for submission to the underlying databases and then appropriately recombining the result sets that are returned. This functionality is provided by the Fe ...
... data integration, a concept known as data federation. In this situation the query engine must be capable of decomposing the query into sub queries for submission to the underlying databases and then appropriately recombining the result sets that are returned. This functionality is provided by the Fe ...
ppt
... Search Key – a set of attributes used to look up records in a file. An index file consists of index records of the form (search-key, pointer) Index files are typically much smaller than the original file Two basic kinds of indices: ...
... Search Key – a set of attributes used to look up records in a file. An index file consists of index records of the form (search-key, pointer) Index files are typically much smaller than the original file Two basic kinds of indices: ...
Pre – Post Conditions
... The Polling Manager polls the Client Request/Response Handler after a specific interval to retrieve the latest data. The Client Request/Response handler queries the Server Request/Response Handler who validates the client. If the client is a valid one it queries the Server DB Manager for latest data ...
... The Polling Manager polls the Client Request/Response Handler after a specific interval to retrieve the latest data. The Client Request/Response handler queries the Server Request/Response Handler who validates the client. If the client is a valid one it queries the Server DB Manager for latest data ...
FG33950952
... query can consider after that processing cost can be calculated & space occupied by that data can also be calculated .After considering all these three parameter one threshold value will select the views for materialization. Mahip Bartere and Dr. Prashant Deshmukh [3] proposed sample views which are ...
... query can consider after that processing cost can be calculated & space occupied by that data can also be calculated .After considering all these three parameter one threshold value will select the views for materialization. Mahip Bartere and Dr. Prashant Deshmukh [3] proposed sample views which are ...
Kroenke-DBP-e10-PPT-Chapter09-Part02
... – Database can be recovered using after-images since the last checkpoint – Checkpoint can be done several times per hour ...
... – Database can be recovered using after-images since the last checkpoint – Checkpoint can be done several times per hour ...
Performing Queries in Oracle Berkeley DB Direct Persistence Layer
... represented as key/data pairs. The keys and data are stored as sequences of bytes. Environments exist as a set of on-disk files within one or more directories. An inmemory cache stores active parts of the indices and frequently accessed data. There are two APIs that allow access to data for basic cr ...
... represented as key/data pairs. The keys and data are stored as sequences of bytes. Environments exist as a set of on-disk files within one or more directories. An inmemory cache stores active parts of the indices and frequently accessed data. There are two APIs that allow access to data for basic cr ...
PPT - ODBMS.org
... Relational Model: A strict mathematical model of information used by most DBMS packages. Object Model: A looser, more familiar information model found in application programming languages. ...
... Relational Model: A strict mathematical model of information used by most DBMS packages. Object Model: A looser, more familiar information model found in application programming languages. ...
Slide 1
... value of Student Number, you can determine one and only one row in Student. Only one student has the number 1325. Every table must have a key. Sometimes more than one column is needed to form a unique identifier. In a table called City, for example, the key would consist of combination of column ...
... value of Student Number, you can determine one and only one row in Student. Only one student has the number 1325. Every table must have a key. Sometimes more than one column is needed to form a unique identifier. In a table called City, for example, the key would consist of combination of column ...
Database Design Data Modeling Standards - PA
... database management system. In the lifecycle of a project it is typically derived from a logical data model, though it may be reverse-engineered from a given database implementation. A physical data model is translated into a data schema. A series of steps to normalize the data should be applied at ...
... database management system. In the lifecycle of a project it is typically derived from a logical data model, though it may be reverse-engineered from a given database implementation. A physical data model is translated into a data schema. A series of steps to normalize the data should be applied at ...
ENABLING HETEROGENOUS MULTI
... are playing an important role in dissemination of the emergency services to the decision makers. Spatial database is one of the most important components in the successful implementation of Emergency Management. It contains spatial data in the form of raster, vector, linked with non-spatial informat ...
... are playing an important role in dissemination of the emergency services to the decision makers. Spatial database is one of the most important components in the successful implementation of Emergency Management. It contains spatial data in the form of raster, vector, linked with non-spatial informat ...
Temporal Data Management for Protocol
... retrieval of data that has multiple temporal dimensions; often connected with database systems Both require temporal data modelling ...
... retrieval of data that has multiple temporal dimensions; often connected with database systems Both require temporal data modelling ...
winword doc
... participating entity types. Relationships usually have structural constraints (e.g. cardinality ratio) that limit the possible combinations of entities. Some entity types may not have key attributes of their own; these are called weak entity types. Weak entities are identified by being related to sp ...
... participating entity types. Relationships usually have structural constraints (e.g. cardinality ratio) that limit the possible combinations of entities. Some entity types may not have key attributes of their own; these are called weak entity types. Weak entities are identified by being related to sp ...
Parallel Database Systems
... Data is fragmented by applying a hash function to an attribute of each row The function specifies placement of the row on a specific disk Ideal if a table is to be sequentially or associatively accessed (i.e. all Young’s in UWdir are on the same disk - saves the overhead of starting a scan at ea ...
... Data is fragmented by applying a hash function to an attribute of each row The function specifies placement of the row on a specific disk Ideal if a table is to be sequentially or associatively accessed (i.e. all Young’s in UWdir are on the same disk - saves the overhead of starting a scan at ea ...
Online Analytical Processing (OLAP) for Decision Support
... process of OLTP includes “updating, querying and presenting” whereas OLAP includes only “querying and presenting”. While OLTP systems routinely perform transactions that update, modify and delete data from databases, OLAP tools are “read only”. They are used exclusively for the retrieval of data (fr ...
... process of OLTP includes “updating, querying and presenting” whereas OLAP includes only “querying and presenting”. While OLTP systems routinely perform transactions that update, modify and delete data from databases, OLAP tools are “read only”. They are used exclusively for the retrieval of data (fr ...
ppt - Washington University in St. Louis
... These operations are used for specifying database retrievals and updates by referring to the constructs of the data model. Operations on the data model may include basic model operations (e.g. generic insert, delete, update) and user-defined operations (e.g. compute_student_gpa, update_inventory) ...
... These operations are used for specifying database retrievals and updates by referring to the constructs of the data model. Operations on the data model may include basic model operations (e.g. generic insert, delete, update) and user-defined operations (e.g. compute_student_gpa, update_inventory) ...
DAT317 Database Schema Versioning: How to Use Microsoft Visual
... http://www.microsoft.com/technet/prodtechnol/sql/bestpractice/default.mspx ...
... http://www.microsoft.com/technet/prodtechnol/sql/bestpractice/default.mspx ...
Chapter 13
... Implementation of Atomicity and Durability The recovery-management component of a database ...
... Implementation of Atomicity and Durability The recovery-management component of a database ...
Slide 0
... The New View from Management • DBA’s are needed to make sure servers and databases are running at optimum • They save the company money by finding the real issue behind performance issues. • They have critical databases restored in a timely manner meaning less disruption to services • The are respo ...
... The New View from Management • DBA’s are needed to make sure servers and databases are running at optimum • They save the company money by finding the real issue behind performance issues. • They have critical databases restored in a timely manner meaning less disruption to services • The are respo ...
Chapter 3
... Enter appropriate conditions in the WHERE clause To join tables, construct the SQL command as: 1. SELECT clause: list all fields you want to display 2. FROM clause: list all tables involved in the query 3. WHERE clause: give the condition that will restrict the data to be retrieved to only those row ...
... Enter appropriate conditions in the WHERE clause To join tables, construct the SQL command as: 1. SELECT clause: list all fields you want to display 2. FROM clause: list all tables involved in the query 3. WHERE clause: give the condition that will restrict the data to be retrieved to only those row ...
Distributed
... obtain locks on all modified copies. – Sends lock requests to remote sites, and while waiting for the response, holds on to other locks! – If sites or links fail, Xact cannot commit until they are back up. – Even if there is no failure, committing must follow an expensive commit protocol with many m ...
... obtain locks on all modified copies. – Sends lock requests to remote sites, and while waiting for the response, holds on to other locks! – If sites or links fail, Xact cannot commit until they are back up. – Even if there is no failure, committing must follow an expensive commit protocol with many m ...
DMExpress and DMX-h
... Data and Log Files Depending on job design, data and output files can include source, intermediate, workspace, target, and log files. Intermediate and target files may be overwritten or created as new. All of these files need to be stored properly and archived/delete d per the retention policy. Usin ...
... Data and Log Files Depending on job design, data and output files can include source, intermediate, workspace, target, and log files. Intermediate and target files may be overwritten or created as new. All of these files need to be stored properly and archived/delete d per the retention policy. Usin ...