RDBMS - E
... (IV) Foreign Key – A foreign key is an attribute or combination of attribute in one base table that points to the candidate key (generally it is the primary key) of another table. The purpose of the foreign key is to ensure referential integrity of the data i.e. only values that are supposed to appe ...
... (IV) Foreign Key – A foreign key is an attribute or combination of attribute in one base table that points to the candidate key (generally it is the primary key) of another table. The purpose of the foreign key is to ensure referential integrity of the data i.e. only values that are supposed to appe ...
1_Obejct_Based_Databases
... with a null reference and then set the reference separately: insert into departments values (`CS’, null) update departments set head = (select p.person_id from people as p where name = `John’) where name = `CS’ ...
... with a null reference and then set the reference separately: insert into departments values (`CS’, null) update departments set head = (select p.person_id from people as p where name = `John’) where name = `CS’ ...
pdf file
... practice the number of possible worlds can be prohibitively large. One solution to this problem is to introduce an intermediate level between the database and the user that verifies that the messages (output and input) that are passed between the database and the user are the same in all worlds, and ...
... practice the number of possible worlds can be prohibitively large. One solution to this problem is to introduce an intermediate level between the database and the user that verifies that the messages (output and input) that are passed between the database and the user are the same in all worlds, and ...
EMC AppSync: Solution for Managing Protection of Microsoft SQL
... Enterprises rely on Microsoft SQL Server for many of their most critical applications. Due to the high business costs associated with data loss and downtime, IT organizations face growing pressure to improve protection of SQL Server databases with minimal disruption to production operations. As SQL ...
... Enterprises rely on Microsoft SQL Server for many of their most critical applications. Due to the high business costs associated with data loss and downtime, IT organizations face growing pressure to improve protection of SQL Server databases with minimal disruption to production operations. As SQL ...
select
... Compound Primary key: when a record has a unique key based on a combination of two fields Foreign key: Field for which every entry has a unique value in another table and where the field in the other table is the primary key for that table Rule of Referential Integrity: every foreign-key field v ...
... Compound Primary key: when a record has a unique key based on a combination of two fields Foreign key: Field for which every entry has a unique value in another table and where the field in the other table is the primary key for that table Rule of Referential Integrity: every foreign-key field v ...
sv-lncs - HAL
... reliable. The objective of parallel database systems is high-performance and highavailability. High-performance (i.e. improving transaction throughput or query response time) is obtained by exploiting data partitioning and query parallelism while high-availability is obtained by exploiting replicati ...
... reliable. The objective of parallel database systems is high-performance and highavailability. High-performance (i.e. improving transaction throughput or query response time) is obtained by exploiting data partitioning and query parallelism while high-availability is obtained by exploiting replicati ...
Chapter 9
... Each tuple of the supertable people can correspond to at most one tuple of each of the tables students and teachers. Each tuple in students and teachers must have exactly one corresponding tuple in people. Inherited attributes other than the primary key of the ...
... Each tuple of the supertable people can correspond to at most one tuple of each of the tables students and teachers. Each tuple in students and teachers must have exactly one corresponding tuple in people. Inherited attributes other than the primary key of the ...
NoSQL in Action - A New Pathway to Database
... be indexed by key value to speed data queries (in that there are not many columns associated with each row). The table’s rows can be sorted by the key value to simplify finding the key during a query. A query essentially comprises two steps: the first step is to calculate the unique key, and the sec ...
... be indexed by key value to speed data queries (in that there are not many columns associated with each row). The table’s rows can be sorted by the key value to simplify finding the key during a query. A query essentially comprises two steps: the first step is to calculate the unique key, and the sec ...
Research on the data warehouse testing method in database design
... The process loaded into process warehouse during ETL is completed, here does not consider the uncompleted instance. Process belonging to different types may be executed more than once, and each execution will add one record in facts and the instance table at the same time. Due to the different data ...
... The process loaded into process warehouse during ETL is completed, here does not consider the uncompleted instance. Process belonging to different types may be executed more than once, and each execution will add one record in facts and the instance table at the same time. Due to the different data ...
java.lang.Object oracle.spatial.geometry.JGeometry
... A spatial database is a database that is optimized to store and query data related to objects in space, including points, lines and polygons. While typical databases can understand various numeric and character types of data, additional functionality needs to be added for databases to process spatia ...
... A spatial database is a database that is optimized to store and query data related to objects in space, including points, lines and polygons. While typical databases can understand various numeric and character types of data, additional functionality needs to be added for databases to process spatia ...
Lecture
... This ability to access multiple types of data stores with a relative simple and flat object model, make ADO the simplest method yet devised for retrieving data ◦ ADO works with ODBC compliant sources ...
... This ability to access multiple types of data stores with a relative simple and flat object model, make ADO the simplest method yet devised for retrieving data ◦ ADO works with ODBC compliant sources ...
Advanced Databases
... Distributed database management system (DDBMS) is a software system that manages a distributed database in such a way that the system of distributed systems transparent to users • DDBMS includes n local DBMS's. • Each local DBMS, labelled Si, (i = 1, ..., n) represents a single node (site, node) of ...
... Distributed database management system (DDBMS) is a software system that manages a distributed database in such a way that the system of distributed systems transparent to users • DDBMS includes n local DBMS's. • Each local DBMS, labelled Si, (i = 1, ..., n) represents a single node (site, node) of ...
Chapter 15 - Emunix Emich
... Updating by multiple computers: allows multiple updates on the same data at multiple sites – Three types of distributed update conflict can occur: • Loss of uniqueness • Lost updates due to concurrent transactions • Updates of deleted data ...
... Updating by multiple computers: allows multiple updates on the same data at multiple sites – Three types of distributed update conflict can occur: • Loss of uniqueness • Lost updates due to concurrent transactions • Updates of deleted data ...
Database Processing
... increases popularity of personal databases Graphical User Interface (GUI) make it easy to use – Examples of early DBMS products: dBase, R:base, and Paradox ...
... increases popularity of personal databases Graphical User Interface (GUI) make it easy to use – Examples of early DBMS products: dBase, R:base, and Paradox ...
Supporting Join Queries
... If there are > 1 relevant producers, then our mediator probably needs an execution engine! - HARD! In any case, we know that some R-GMA users are defining Archivers and querying these directly. However: ...
... If there are > 1 relevant producers, then our mediator probably needs an execution engine! - HARD! In any case, we know that some R-GMA users are defining Archivers and querying these directly. However: ...
Geographical Database
... Reference Identification Number (SRID) This number corresponds to another table in the database with all of the spatial reference systems used. This allows the database to know what projection each table is in, and if need be, reproject those tables for calculations ...
... Reference Identification Number (SRID) This number corresponds to another table in the database with all of the spatial reference systems used. This allows the database to know what projection each table is in, and if need be, reproject those tables for calculations ...
Relational Data Model
... – Updates may propagate to cause other updates automatically. This may be necessary to maintain integrity constraints. ...
... – Updates may propagate to cause other updates automatically. This may be necessary to maintain integrity constraints. ...
OLAP OF THE FUTURE A Min Tjoa , Roland Wagner , Philipp
... to construct an independent, redundant database from denormalized data [13, 14]. Pre-materialization attempts to do as much work in advance as possible. All data sources are integrated into a single database during the pre-materialization. Aggregated values are then added to the resulting database, ...
... to construct an independent, redundant database from denormalized data [13, 14]. Pre-materialization attempts to do as much work in advance as possible. All data sources are integrated into a single database during the pre-materialization. Aggregated values are then added to the resulting database, ...
Optimizing Large Data Handling in SAP ASE for Better
... It is an unfortunate reality that database tables require both logical and physical maintenance. From a logical level, older rows may need to be archived or daily bulk feeds need to be loaded. From a physical perspective, the tables need to have index statistics maintained and possibly reorganized, ...
... It is an unfortunate reality that database tables require both logical and physical maintenance. From a logical level, older rows may need to be archived or daily bulk feeds need to be loaded. From a physical perspective, the tables need to have index statistics maintained and possibly reorganized, ...
The UNIX Shell As a Fourth Generation Language Evan Schaffer
... Too many 4GL’s are good only for projects within a narrow application area. It’s difficult to allow for high-level constructs from a variety of fields without the programmer having to specify the level of detail required in a 3GL. The paradigm we choose for fourth generation languages is the operato ...
... Too many 4GL’s are good only for projects within a narrow application area. It’s difficult to allow for high-level constructs from a variety of fields without the programmer having to specify the level of detail required in a 3GL. The paradigm we choose for fourth generation languages is the operato ...
Chapter 15
... Implementation of Atomicity and Durability The recovery-management component of a database system ...
... Implementation of Atomicity and Durability The recovery-management component of a database system ...