a distributed database system

... sites around the state of California with a wide variety of hardware and storage capacities Each site has its own database administrator, and the willingness of any site to perform work on behalf ... execution plans that can adapt to the environment (such as unbalanced workload and poor data placement) in a flexible manner We are implementing more sophisticated features and plan a general release ... in many places by an economic paradigm Replication is one such area The details of the Mariposa replication system are contained in a separate paper (Sidell 1995) In short, copy holders maintain...

Ngày tải lên: 23/03/2014, 12:20

... remote database Public Database Link You can create a public database link for a database All users and PL/SQL subprograms in the database can use a public database link to access data and database ... distributed database system, each database should have a unique global name Global database names identify each database in the system A global database name consists of two components: a database name ... database in the system to ease the configuration of distributed database access Databases and Database Links Each database in a distributed database is distinct from all other databases in the system...

Ngày tải lên: 17/01/2014, 09:20

... remote database Public Database Link You can create a public database link for a database All users and PL/SQL subprograms in the database can use a public database link to access data and database ... distributed database system, each database should have a unique global name Global database names identify each database in the system A global database name consists of two components: a database name ... database in the system to ease the configuration of distributed database access Databases and Database Links Each database in a distributed database is distinct from all other databases in the system...

Ngày tải lên: 07/03/2014, 23:20

... on Management of Data, May 1994 [CS92] RakeshChandmand Arie Segev.ManagingTemporalFinancial Data in anExtensible Database. In Proceedings of the International Conference on Very Large Databases(VWB), ... supports relational data as well as sequencedata, using a novel design paradigm of enhancedabstractdata types (BADTs ) The systemimplementation basedon this paradigmallows sequence relational queriesto ... valueis created,or determinedautomatically by the system Catalog Management: Each E-ADT can provide catalogs that maintain statisticsand storeschemainformation Further, certain valuesmay be named Query...

Ngày tải lên: 16/03/2014, 16:20

... quality camera calibration is key Because of this, there are various techniques and methods available that provide camera calibration In most camera based calibration techniques and methods calibration ... improvements in camera calibration can be made with the assistance of a tool provided by Cal Tech [11] This tool in conjunction with MatLab allows for a more accurate camera calibration As a tracked object ... provide an accurate tracking estimate as to the current location of the object This camera communication is done over a local area network (LAN) and allows for the sharing and propagation of tracking...

Ngày tải lên: 24/08/2014, 10:54

... building graph and a calculation of the shortest paths by using Dijkstra’s algorithm An evacuee becomes aware of a hazardous area when it reaches a location close to it This triggers an update in ... hazard A low value indicates that the system has succeeded in directing the evacuees along safe paths, avoiding the hazardous locations • Percentage of fatally injured evacuees This is a straightforward ... evacuation The actors that take part in the simulation are modeled as agents Each one has its own health model and movement model that depend on the individual characteristics of the actors and...

Ngày tải lên: 07/12/2013, 11:41

... learning the tools and operations a particular DBMS provides • learning a particular database schema • learning a particular database This chapter gives a whirlwind tour of a small example database, ... is a relational database? A database can be any collection of information, hopefully organized in some fashion that makes it easy to find a particular piece of information Relational databases ... explains some basic concepts behind relational database systems and how these concepts appear in Datascope Datascope: What is it? Datascope is a relational database system in which tables are...

Ngày tải lên: 20/02/2014, 05:21

... in all three DBMS models is that the buffer pool is a large shared data structure available to all database threads and/or processes When a thread needs a page to be read in from the database, ... make calls to fetch data from the DBMS’ Transactional Storage Manager (Figure 1.1, bottom), which manages all data access (read) and manipulation (create, update, delete) calls The storage system ... life of a query in a database system This also serves as an overview of the remaining sections of the paper Consider a simple but typical database interaction at an airport, in which a gate agent...

Ngày tải lên: 20/02/2014, 05:21

... 1987 An intermediate database language and its rulebased transformation to different database languages Data and Knowledge Engineering 2,1-29 Pu, C 1987 Superdatabases: Transactions across database ... nonfederated database systems and federated database systems A nonfederated database system is an integration of component DBMSs that are not autonomous It has only one level of management,2 and all ... of various system components Basic types of system components in our reference architecture are as follows: Data: Data are the basic facts and information managed by a DBS Database: A database...

Ngày tải lên: 20/02/2014, 05:21

... Dominican Republic, Ecuador, Estonia, Finland, Ghana, Indonesia, Jamaica, Japan, Korea, Latvia, Lithuania, Malaysia, Mexico, Nicaragua, Norway, Paraguay, Philippines, Russia, Sri Lanka, Sweden, Thailand, ... States reached a peak around mid-2006 and began to decline after the initial signs that a financial crisis may be around the corner Losses at financial institutions began to appear as early as ... residential-mortgage-backed securities (MBS), and non-agency AAA/Aaarated private-label residential MBS Similarly, it increased its currency swap lines with other Central Banks as an attempt to reestablish...

Ngày tải lên: 20/02/2014, 05:22

Ngày tải lên: 27/02/2014, 07:20

... non-transactional storage system into a (near-)linearly scalable shared-nothing database system that provides high availability, strong consistency, and full ACID transactions • A practical implementation ... database state change would have far too high of an overhead to be feasible Instead, deterministic database systems synchronously replicate batches of transaction requests In a traditional database ... transactional input (and several other minor modifications to the database are made [28]), all replicas can be made to emulate the same serial execution order, and database state can be guaranteed...

Ngày tải lên: 07/03/2014, 14:20

... operators (min-max, average, etc.) The fscan and iscan stages are replicated and are separately attached to the database tables This way, queries that access the same tables can take advantage ... execution plan and apply a dataflow approach for designing highperformance, scalable systems In the GAMMA database machine project [De+90] each relational operator is assigned to a process, and all processes ... common or shared data and code (to avoid stage and scheduling overhead), and separate operators that access a large common code base or common data (to take advantage of a stage’s affinity to...

Ngày tải lên: 07/03/2014, 14:20

Ngày tải lên: 08/03/2014, 18:20

... either an x or a y or a constant, and θ is a comparator (e.g., , ≥, =, =) In particular, each x and each y must appear at least once among the zs PANORAMA: A DATABASE SYSTEM THAT ANNOTATES ... Section 3.2 PANORAMA: A DATABASE SYSTEM THAT ANNOTATES ITS ANSWERS 63 In addition, Panorama extends the query language with three statements to manipulate and query the meta -database To add a new property ... real world value Thus, a null value is practically a declaration of the unsoundness of a particular data value The Closed World Assumption states that a database contains all the data that it attempts...

Ngày tải lên: 16/03/2014, 16:20

... in-place updates When a transaction updates a data page, it makes a copy, i.e., a shadow, of that page and operates on that When the transaction commits, the system records the changes to new addresses ... Transaction Manager Data Access Manager Data Access Manager Mem index Mem index Read cache Log … Transaction Manager … Read cache Data Access Manager Mem index Log … … Read cache Log … DFS Client ... Cassandra [16] and HBase [1] employ key-value model or its variants and make a trade-off between system scalability and functionality Recently, some systems such as Megastore [3] adopt a variant...

Ngày tải lên: 16/03/2014, 16:20

... invalidations or bodies of updates should be sent Every update comprises an invalidation and a body An invalidation indicates that an update of a particular object occurred at a particular instant ... University of Texas at Austin References [1] http://spinroot.com/spin/whatispin.html [2] N Belaramani, M Dahlin, L Gao, A Nayate, A Venkataramani, P Yalagandula, and J Zheng PRACTI replication In Proc ... and M Mahalingam Taming aggressive replication in the Pangaea wide-area file system In Proc OSDI, Dec 2002 [27] M Satyanarayanan, J Kistler, P Kumar, M Okasaki, E Siegel, and D Steere Coda: A highly...

Ngày tải lên: 16/03/2014, 19:20

... M., and Tiberio, P Physical Database Design for Relational Databases ACM Trans on Database Systems, Vol 13, No 1, March 1988 [41] Frank,M,, Omiecinski, E., Navathe, S.: Adaptive and Automated ... memory as well as automated storage/data layout management For example, automated memory management in database servers makes it 11 possible to leverage adaptive operators and adjust memory assigned ... widespread use of relational database systems for mission critical OLTP and decision support applications has made the task of reducing the cost of managing relational database systems an important...

Ngày tải lên: 23/03/2014, 12:20

... media, and (Gibbs et al 1993) deals with so-called audio/video (AV) databases These databases are collections of digital audio/video data and processes which can 37 compose and aggregate these data ... interface and will return a collection of all the articles dealing with education in Canada: os _database *news _database; os_Set *all_articles; os_Set& matching_articles = all_articles->query ... basis for a hierarchical data model and for temporal access control algorithms to allow VCR-like capabilities They show how it can be mapped to a relational database and derive the playback algorithm...

Ngày tải lên: 30/03/2014, 22:20

... disparity-compensated one [5, 6] 2.2 Rendering Using Multiview Images We assume that multiview images are captured with calibrated cameras that roughly lie on a plane and are arranged on a 2D ... (practical) camera arrangement, the reference regions are similarly defined as quadrangular segments in the input images Based on the locality of the reference regions, several camera array systems ... are captured by moving a single camera on a control stage, which is an ideal condition for generating accurate side information Since they are captured on a regular 2D grid with a fixed camera...

Ngày tải lên: 22/06/2014, 00:20