XML and Databases
... Mappings between document schemas and database schemas are performed on element types, attributes, and text. They almost always omit physical structure (such as entities, CDATA sections, and encoding information) and some logical structure (such as processing instructions, comments, and the order in ...
... Mappings between document schemas and database schemas are performed on element types, attributes, and text. They almost always omit physical structure (such as entities, CDATA sections, and encoding information) and some logical structure (such as processing instructions, comments, and the order in ...
Introduction
... For example, an accountant at a hospital would not need to see tables containing patient medical records. Even though the accountant may be an honest and hardworking employee, his job does not require access to tables containing patient medical records. Conversely, a medical doctor would not need ac ...
... For example, an accountant at a hospital would not need to see tables containing patient medical records. Even though the accountant may be an honest and hardworking employee, his job does not require access to tables containing patient medical records. Conversely, a medical doctor would not need ac ...
Transaction Management
... COMMIT statement – ends the SQL trans.; effects permanently recorded within DB ROLLBACK statement – DB is rolled back to its previous consistent state and all the changes ...
... COMMIT statement – ends the SQL trans.; effects permanently recorded within DB ROLLBACK statement – DB is rolled back to its previous consistent state and all the changes ...
No Slide Title
... Information about an enterprise is broken up into parts, with each relation storing one part of the information E.g.: account: stores information about accounts depositor: stores information about which customer owns which account customer: stores information about customers Storing all information ...
... Information about an enterprise is broken up into parts, with each relation storing one part of the information E.g.: account: stores information about accounts depositor: stores information about which customer owns which account customer: stores information about customers Storing all information ...
Chapter 6 (PDF, 31 pages, 1.51 MB)
... or age) is called a field. A group of related fields, such as the student’s name, the course taken, the date, and the grade, makes up a record; a group of records of the same type is called a file. For example, the records in Figure 6-1 could constitute a student course file. A group of related file ...
... or age) is called a field. A group of related fields, such as the student’s name, the course taken, the date, and the grade, makes up a record; a group of records of the same type is called a file. For example, the records in Figure 6-1 could constitute a student course file. A group of related file ...
Slide 1
... functions are completed. Data sharing systems can only have V9 members in this mode. ...
... functions are completed. Data sharing systems can only have V9 members in this mode. ...
A Strategy for Reducing I/O and Improving Query Processing Time in
... access, also known as I/O. Bitmap indexing, partitioning, and denormalization are three performance improvement techniques that are available in many of the major enterprise database systems in use today. These techniques work on the premise of reducing I/O, with lower I/O leading to faster query pr ...
... access, also known as I/O. Bitmap indexing, partitioning, and denormalization are three performance improvement techniques that are available in many of the major enterprise database systems in use today. These techniques work on the premise of reducing I/O, with lower I/O leading to faster query pr ...
First-order Predicate Logic (FOPL) as an Ontology Language
... Syntax of FOPL: signature A signature for FOPL consists of • a set V of variables denoted by x, x0 , x1 , . . . , y, y0 , y1 , . . . , z, z0 , z1 . . .; • a set P of predicate symbols each of which comes with a positive number as its arity. Predicates of arity one are called unary predicates and ar ...
... Syntax of FOPL: signature A signature for FOPL consists of • a set V of variables denoted by x, x0 , x1 , . . . , y, y0 , y1 , . . . , z, z0 , z1 . . .; • a set P of predicate symbols each of which comes with a positive number as its arity. Predicates of arity one are called unary predicates and ar ...
ch5
... subformula is true if and only if there is a value of x in dom(P1) such that P1(x) is true. 3. For every “for all” subformula of the form x (P1 (x)), the subformula is true if and only if P1(x) is true for all values x from dom (P1). ...
... subformula is true if and only if there is a value of x in dom(P1) such that P1(x) is true. 3. For every “for all” subformula of the form x (P1 (x)), the subformula is true if and only if P1(x) is true for all values x from dom (P1). ...
Implementing Geolocation
... substantial interest and a potential for significant value to be generated if some of these applications are successful. Equally, there is a wide range of potential applications and technologies, implying that a high degree of flexibility should be provided in our implementation approach. We believe ...
... substantial interest and a potential for significant value to be generated if some of these applications are successful. Equally, there is a wide range of potential applications and technologies, implying that a high degree of flexibility should be provided in our implementation approach. We believe ...
Present status of the KEKB control system
... server code[5]. The code is ported to EPICS R3.13 on HPUX10.20. This prototype can control only magnet power supplies in the LINAC control system. Ability to control other devices in the LINAC control system is being implemented. ...
... server code[5]. The code is ported to EPICS R3.13 on HPUX10.20. This prototype can control only magnet power supplies in the LINAC control system. Ability to control other devices in the LINAC control system is being implemented. ...
Outline
... ➡ Difficult to estimate the size of the intermediate resultserror propagation ➡ Can amortize over many executions ➡ R* Dynamic ➡ Run time optimization ➡ Exact information on the intermediate relation sizes ➡ Have to reoptimize for multiple executions ➡ Distributed INGRES Hybrid ➡ Compile using a st ...
... ➡ Difficult to estimate the size of the intermediate resultserror propagation ➡ Can amortize over many executions ➡ R* Dynamic ➡ Run time optimization ➡ Exact information on the intermediate relation sizes ➡ Have to reoptimize for multiple executions ➡ Distributed INGRES Hybrid ➡ Compile using a st ...
RAMP' up your storage options - strategies for warehouse repositories
... An MDDB will generally be much smaller than the base table or tables it is created from. The reasons for this include: •atomic level detail not stored in MDDB •storing calculations is optional •summary records compressed where possible •dimensional labels stored separate from tables, saving space on ...
... An MDDB will generally be much smaller than the base table or tables it is created from. The reasons for this include: •atomic level detail not stored in MDDB •storing calculations is optional •summary records compressed where possible •dimensional labels stored separate from tables, saving space on ...
NCL Collection Management System - International Atomic Energy
... Abstract structure (this version implements file structure repository) Unified structure Location through a configuration file Multiple versions support Flexible structure currently based on RN and file type Multiple types (currently only PDF is used but the repository has capability to handle diffe ...
... Abstract structure (this version implements file structure repository) Unified structure Location through a configuration file Multiple versions support Flexible structure currently based on RN and file type Multiple types (currently only PDF is used but the repository has capability to handle diffe ...
What Is a Transaction?
... An Example Of A Page-Level Lock •T1 and T2 cannot access the same page concurrently, even if they use different rows. • the most frequently used multiuser DBMS locking methods. ...
... An Example Of A Page-Level Lock •T1 and T2 cannot access the same page concurrently, even if they use different rows. • the most frequently used multiuser DBMS locking methods. ...
cos346day19
... transactions that appear to users as they are being processed against a database at the same time • In reality, CPU can execute only one instruction at a time – Transactions are interleaved meaning that the operating system quickly switches CPU services among tasks so that some portion of each of th ...
... transactions that appear to users as they are being processed against a database at the same time • In reality, CPU can execute only one instruction at a time – Transactions are interleaved meaning that the operating system quickly switches CPU services among tasks so that some portion of each of th ...
6-1-WebApplicationDevelopmentModels
... Some CGI programs are in machine code, but Perl programs are usually kept in source form, so Perl must be run on them A source file can be made to be “executable” by adding a line at their beginning that specifies that a language processing program be run on them first For Perl programs, if the perl ...
... Some CGI programs are in machine code, but Perl programs are usually kept in source form, so Perl must be run on them A source file can be made to be “executable” by adding a line at their beginning that specifies that a language processing program be run on them first For Perl programs, if the perl ...
Boston College Computer Science Department Senior Thesis 2002
... In “SQL Server for Windows CE – A Database Engine for Mobile and Embedded Platforms,” the authors, two Microsoft employees, describe a separate version of SQL tailored specifically for the capabilities of mobile devices. This version of SQL is designed to deal with the storage, battery, and bandwid ...
... In “SQL Server for Windows CE – A Database Engine for Mobile and Embedded Platforms,” the authors, two Microsoft employees, describe a separate version of SQL tailored specifically for the capabilities of mobile devices. This version of SQL is designed to deal with the storage, battery, and bandwid ...
Unit 5 Text A
... modem. Or, if your computer is part of a LAN, an Internet connection can be provided by a LAN link. A local area network is called an intranet. Intranets are popular with businesses that want to store information as Web pages but not provide them for public access. An intranet that provides external ...
... modem. Or, if your computer is part of a LAN, an Internet connection can be provided by a LAN link. A local area network is called an intranet. Intranets are popular with businesses that want to store information as Web pages but not provide them for public access. An intranet that provides external ...
Block oriented processing of relational database
... oriented operators and query processing schemes have been implemented in IBM's DB2 Universal Database (UDB) system [9]. The main feature of this technique is to construct a block'of intermediate records that can be used by one or more database operators. A block descriptor data structure is used to ...
... oriented operators and query processing schemes have been implemented in IBM's DB2 Universal Database (UDB) system [9]. The main feature of this technique is to construct a block'of intermediate records that can be used by one or more database operators. A block descriptor data structure is used to ...
Using Databases – OpenOffice.org Base
... A table is organized in horizontal rows and vertical columns: Field – contains information about a table object; fields form table columns. Fields are normally given a name in the column header, indicating what kind of data they contain. A particular data type can be assigned to fields, e.g., number ...
... A table is organized in horizontal rows and vertical columns: Field – contains information about a table object; fields form table columns. Fields are normally given a name in the column header, indicating what kind of data they contain. A particular data type can be assigned to fields, e.g., number ...
s - CSE, IIT Bombay
... to answer a query select * from r where P, where P is a predicate, (1)It is always better to use the secondary index (2)It is always better to use file scan (3)It depends on the number of records fetched by the query (4)None of the above ...
... to answer a query select * from r where P, where P is a predicate, (1)It is always better to use the secondary index (2)It is always better to use file scan (3)It depends on the number of records fetched by the query (4)None of the above ...
Database model
A database model is a type of data model that determines the logical structure of a database and fundamentally determines in which manner data can be stored, organized, and manipulated. The most popular example of a database model is the relational model, which uses a table-based format.