Genesis: A Distributed Database Operating System
... More importantly, a databasesystem is not so much itself an application, but one of the programming tools that an application uses If the mechanismsto provide transparency, reliability and good performance in a network environment are not implemented in the underlying operating sys tern, but instead ...
... More importantly, a databasesystem is not so much itself an application, but one of the programming tools that an application uses If the mechanismsto provide transparency, reliability and good performance in a network environment are not implemented in the underlying operating sys tern, but instead ...
distributed_db_arch_replication
... a transaction will perform slowly if it requires data from different sites, unless the network connecting them is very fast a transaction performing much replication of updates will perform slowly if there is frequent contention for resources (locking) frequently used transactions should be optimise ...
... a transaction will perform slowly if it requires data from different sites, unless the network connecting them is very fast a transaction performing much replication of updates will perform slowly if there is frequent contention for resources (locking) frequently used transactions should be optimise ...
Data & Databases
... the optimal location. A version of parallel processing. Client Server: Data (usually departmental) maintained on a server. Subsetting occurs on the server, processing on ...
... the optimal location. A version of parallel processing. Client Server: Data (usually departmental) maintained on a server. Subsetting occurs on the server, processing on ...
Document
... JTS gets less press than EJB technology because the services it provides to the application are largely transparent many developers are not even aware of where transactions begin and end in their application. ...
... JTS gets less press than EJB technology because the services it provides to the application are largely transparent many developers are not even aware of where transactions begin and end in their application. ...
Main Memory Database Systems
... fact that a process holds or may hold a latch must be observable by the cleanup server • If the target architecture provides only test-and-set or register-memory-swap as atomic instructions, then extra care must be taken to determine in the process did in fact own the latch ...
... fact that a process holds or may hold a latch must be observable by the cleanup server • If the target architecture provides only test-and-set or register-memory-swap as atomic instructions, then extra care must be taken to determine in the process did in fact own the latch ...
Recovery
... • Alternative to log-based recovery • Idea: maintain two page tables during the lifetime of a trans-action the current page table, and the shadow page table • Store the shadow page table in nonvolatile storage, such that state of the database prior to transaction execution may be recovered. Shadow p ...
... • Alternative to log-based recovery • Idea: maintain two page tables during the lifetime of a trans-action the current page table, and the shadow page table • Store the shadow page table in nonvolatile storage, such that state of the database prior to transaction execution may be recovered. Shadow p ...
Natix
... by the creation of a log record for that operation • A conventional logging approach would not only create bulky log records for every single node insertion, but would also log all of the split operations. Natix approach: • Compositing update operations as one big operation to avoid the overhead of ...
... by the creation of a log record for that operation • A conventional logging approach would not only create bulky log records for every single node insertion, but would also log all of the split operations. Natix approach: • Compositing update operations as one big operation to avoid the overhead of ...
TRUNCATE TABLE
... RECOVERY - Instructs the restore operation to rollback any uncommitted transactions - you cannot apply any more transaction logs NORECOVERY - Instructs the restore operation to not roll back any uncommitted transactions - lets you apply more transaction logs STAND BY - Leave database readonly ...
... RECOVERY - Instructs the restore operation to rollback any uncommitted transactions - you cannot apply any more transaction logs NORECOVERY - Instructs the restore operation to not roll back any uncommitted transactions - lets you apply more transaction logs STAND BY - Leave database readonly ...
Concurrency Control
... A schedule S is serializable if there exists a serial order SO such that: The state of the database after S is the same as the state of the database after SO The values read by each transaction in S is the same as that returned by each transaction in SO • Database does not know anything about the in ...
... A schedule S is serializable if there exists a serial order SO such that: The state of the database after S is the same as the state of the database after SO The values read by each transaction in S is the same as that returned by each transaction in SO • Database does not know anything about the in ...
Database Concepts
... Application makes request to distributed DBMS Distributed DBMS checks distributed data repository for location of data. Finds that it is remote Distributed DBMS routes request to remote site Distributed DBMS at remote site translates request for its local DBMS if necessary, and sends request to loca ...
... Application makes request to distributed DBMS Distributed DBMS checks distributed data repository for location of data. Finds that it is remote Distributed DBMS routes request to remote site Distributed DBMS at remote site translates request for its local DBMS if necessary, and sends request to loca ...
db.reading-doc
... systems literature, testing the students' preparedness and ability for pursuing serious research in the database area. As such, students who do not intend to pursue database-related Ph.D. topics are advised not to attempt taking this exam. The exam will be graded with the expectation that each exami ...
... systems literature, testing the students' preparedness and ability for pursuing serious research in the database area. As such, students who do not intend to pursue database-related Ph.D. topics are advised not to attempt taking this exam. The exam will be graded with the expectation that each exami ...
Database Qualifying Exam Reading List, Fall 2007
... systems literature, testing the students' preparedness and ability for pursuing serious research in the database area. As such, students who do not intend to pursue database-related Ph.D. topics are advised not to attempt taking this exam. The exam will be graded with the expectation that each exami ...
... systems literature, testing the students' preparedness and ability for pursuing serious research in the database area. As such, students who do not intend to pursue database-related Ph.D. topics are advised not to attempt taking this exam. The exam will be graded with the expectation that each exami ...
Syllabus - SCRIET Library
... sharing and the web challenges, System models, Architectural models, fundamental models. Theoretical foundation for distributed system: Limitation of distributed System a absence of global clock, shared memory, logical clocks, Lampposts& vectors logical clocks casual ordering of messages, global sta ...
... sharing and the web challenges, System models, Architectural models, fundamental models. Theoretical foundation for distributed system: Limitation of distributed System a absence of global clock, shared memory, logical clocks, Lampposts& vectors logical clocks casual ordering of messages, global sta ...
Syllabus for CSCI 6441: Database Management Systems GWU
... Select a database-related topic of your choice, learn something about that topic on your own, and make a short presentation to the class on what you have learned. 3. Exercise Assignments (15%) In order to reinforce techniques introduced through lecture and text, exercises will be assigned approximat ...
... Select a database-related topic of your choice, learn something about that topic on your own, and make a short presentation to the class on what you have learned. 3. Exercise Assignments (15%) In order to reinforce techniques introduced through lecture and text, exercises will be assigned approximat ...
Distributed DBMS
... general such systems allow locking at one or more sizes: page locks, table locks, database locks and row lock. • Although many locking decisions are straightforward, some locking issues are much more subtle. For instance, the relationship between deadlock occurrence, the locking strategy adopted and ...
... general such systems allow locking at one or more sizes: page locks, table locks, database locks and row lock. • Although many locking decisions are straightforward, some locking issues are much more subtle. For instance, the relationship between deadlock occurrence, the locking strategy adopted and ...
Kroenke-DBP-e10-PPT-Chapter09
... – No lock is released until the COMMIT or ROLLBACK command is issued – This strategy is more restrictive but easier to implement than two-phased locking DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall ...
... – No lock is released until the COMMIT or ROLLBACK command is issued – This strategy is more restrictive but easier to implement than two-phased locking DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall ...
Note 01
... • Most IS are based on databases • Fundamentally changed the way many organizations operate • Business without database? ...
... • Most IS are based on databases • Fundamentally changed the way many organizations operate • Business without database? ...
Data Integrity
... Undo : is in the log but is not. Undo:
restore the value of all data items updated by Ti to their old
values, going backwards from the last log record for Ti
Redo: and are both in the log.
Redo: sets the value of all data items updated by Ti to ...
... Undo :
One-Copy Serializability with Snapshot Isolation under
... With careful design and engineering, SI engines can be replicated to get even higher performance with a replicated form of SI such as Generalized Snapshot Isolation (GSI) [13], which is also not serializable. The objective of this paper is to provide a concurrency control algorithm for replicated SI ...
... With careful design and engineering, SI engines can be replicated to get even higher performance with a replicated form of SI such as Generalized Snapshot Isolation (GSI) [13], which is also not serializable. The objective of this paper is to provide a concurrency control algorithm for replicated SI ...
Features of ORM
... Changes to the object model are made in one place. One you update your object definitions, the ORM will automatically use the updated structure for retrievals and updates. There are no SQL Update, Delete and Insert statements strewn throughout different layers of the application that need modifica ...
... Changes to the object model are made in one place. One you update your object definitions, the ORM will automatically use the updated structure for retrievals and updates. There are no SQL Update, Delete and Insert statements strewn throughout different layers of the application that need modifica ...
Distributed Database System
... Different sites may use different schemas and software Difference in schema is a major problem for query processing Difference in software is a major problem for transaction ...
... Different sites may use different schemas and software Difference in schema is a major problem for query processing Difference in software is a major problem for transaction ...
chap13-abbrev
... DBMS translation between nodes with different local DBMSs (using middleware) Data management functions: security, concurrency, deadlock control, query optimization, failure recovery Data consistency (via multiphase commit protocols) Global primary key control Scalability Data and stored procedure re ...
... DBMS translation between nodes with different local DBMSs (using middleware) Data management functions: security, concurrency, deadlock control, query optimization, failure recovery Data consistency (via multiphase commit protocols) Global primary key control Scalability Data and stored procedure re ...
ch1p2
... 2- Reduced application development time: incremental time to add each new application is reduced. 3- Flexibility to change data structures: database structure may evolve as new requirements are defined. 4- Availability of up-to-date information – very important for on-line transaction systems such a ...
... 2- Reduced application development time: incremental time to add each new application is reduced. 3- Flexibility to change data structures: database structure may evolve as new requirements are defined. 4- Availability of up-to-date information – very important for on-line transaction systems such a ...