cs440outline - Computer Science Home
... To learn the evolution of database systems and to appreciate the advantages of database over file systems in terms of efficiency and effectiveness. To understand the basic concepts of database systems including data abstraction and the three-level architecture; data independence; and data modeling. ...
... To learn the evolution of database systems and to appreciate the advantages of database over file systems in terms of efficiency and effectiveness. To understand the basic concepts of database systems including data abstraction and the three-level architecture; data independence; and data modeling. ...
database server
... – Queries used to produce lists of products – Updates used to store orders • New record created for order in Order table • Customer information added to other tables • Quantities updated in inventory tables ...
... – Queries used to produce lists of products – Updates used to store orders • New record created for order in Order table • Customer information added to other tables • Quantities updated in inventory tables ...
Recovery - Dr Gordon Russell
... Immediate update, or UNDO/REDO, is another algorithm to support ABORT and machine failure scenarios. While a transaction runs, changes made by that transaction can be written to the database at any time. However, the original and the new data being written must both be stored in the log BEFORE sto ...
... Immediate update, or UNDO/REDO, is another algorithm to support ABORT and machine failure scenarios. While a transaction runs, changes made by that transaction can be written to the database at any time. However, the original and the new data being written must both be stored in the log BEFORE sto ...
Recovery
... nothing has to be done at recovery Problem: basically not possible with update-in-place ...
... nothing has to be done at recovery Problem: basically not possible with update-in-place ...
+ Database Consistency
... “The salary of an employee must not be greater than the salary of the manager of the department that the employee works for’’ ...
... “The salary of an employee must not be greater than the salary of the manager of the department that the employee works for’’ ...
King Mongkut`s University of Technology North Bangkok Faculty of
... Lecture 1: Course Introduction Lecture 2: Concepts of Database Systems and ...
... Lecture 1: Course Introduction Lecture 2: Concepts of Database Systems and ...
An Essay on Real
... have a priority strictly higher than the highest priority ceiling of all data items locked by all other transactions. The priority ceiling protocol overcomes the two shortcomings of the priority inheritance method – deadlocks are prevented and high priority transactions are blocked by at most one tr ...
... have a priority strictly higher than the highest priority ceiling of all data items locked by all other transactions. The priority ceiling protocol overcomes the two shortcomings of the priority inheritance method – deadlocks are prevented and high priority transactions are blocked by at most one tr ...
Horticulture
... – the above determines two crucial factors: • the number of transactions accessing multiple nodes • the skewness of the load across the cluster A growing fraction of distributed transactions and load skew => 10x worse performance (see following slides) ...
... – the above determines two crucial factors: • the number of transactions accessing multiple nodes • the skewness of the load across the cluster A growing fraction of distributed transactions and load skew => 10x worse performance (see following slides) ...
One-Copy Serializability with Snapshot Isolation under
... • We propose SGSI, a novel concurrency control algorithm for replicated databases with SI replicas. SGSI ensures 1SR, an isolation level stronger than the level of individual components. We formally prove SGSI correctness; • We are the first to address the problem of readset management in a replicat ...
... • We propose SGSI, a novel concurrency control algorithm for replicated databases with SI replicas. SGSI ensures 1SR, an isolation level stronger than the level of individual components. We formally prove SGSI correctness; • We are the first to address the problem of readset management in a replicat ...
distributed
... DDBMS: - no performance degradation due to distributed architecture. - determine most cost-effective strategy to execute a request. Distributed Query Processor (DQP) maps data request into ordered sequence of operations on local databases. - Must consider fragmentation, replication, and allocation s ...
... DDBMS: - no performance degradation due to distributed architecture. - determine most cost-effective strategy to execute a request. Distributed Query Processor (DQP) maps data request into ordered sequence of operations on local databases. - Must consider fragmentation, replication, and allocation s ...
Transaction Management Overview
... Steal approach: the changes made to an object O by a transaction T may be written to disk before T commits. This arises when the buffer manager decides to replace the frame containing O by a page (belonging to a different transaction) from disk. Force approach: Force all writes of a committed transa ...
... Steal approach: the changes made to an object O by a transaction T may be written to disk before T commits. This arises when the buffer manager decides to replace the frame containing O by a page (belonging to a different transaction) from disk. Force approach: Force all writes of a committed transa ...
CC 1 - CS-People by full name
... follow a modified protocol called strict two-phase locking. Here a transaction must hold all its exclusive locks till it commits/aborts. Rigorous two-phase locking is even stricter: here all locks are held ...
... follow a modified protocol called strict two-phase locking. Here a transaction must hold all its exclusive locks till it commits/aborts. Rigorous two-phase locking is even stricter: here all locks are held ...
Database Architecture for Autonomous Transportation Agents for On-scene Networked Incident Management (ATON)
... Query 1: (Exit) Find cars that entered lane 1, then entered the exit lane, and finally exited from the exit lane. Query 2: (Tailgate) Find a set of cars that entered lane 1 almost simultaneously. Query 3: (Simultaneous) Find an object that while entering lane 3 was also turning left. The first query ...
... Query 1: (Exit) Find cars that entered lane 1, then entered the exit lane, and finally exited from the exit lane. Query 2: (Tailgate) Find a set of cars that entered lane 1 almost simultaneously. Query 3: (Simultaneous) Find an object that while entering lane 3 was also turning left. The first query ...
SQL Server & High Availability - e
... or Service That They Require. A Resource is Available, or Not. • High Availability = Building Redundancy into a System or Service So As To MAINTAIN AVAILABILITY in the Event of a Certain Failure or Failures ...
... or Service That They Require. A Resource is Available, or Not. • High Availability = Building Redundancy into a System or Service So As To MAINTAIN AVAILABILITY in the Event of a Certain Failure or Failures ...
IMAGE`s coming of age
... have changed dramatically since then and, as Hewlett-Packard evolved IMAGE/3000 into TurboIMAGE and IMAGE/SQL, Adager changed accordingly. The few “functions” described in this paper have grown immensely and their names have also become less cryptic (“PAVEPATH” became “Repack Dataset” and “CAPDTAIL/ ...
... have changed dramatically since then and, as Hewlett-Packard evolved IMAGE/3000 into TurboIMAGE and IMAGE/SQL, Adager changed accordingly. The few “functions” described in this paper have grown immensely and their names have also become less cryptic (“PAVEPATH” became “Repack Dataset” and “CAPDTAIL/ ...
ppt
... Transaction and System Concepts Commit Point of a Transaction (cont): • Redoing transactions: • Transactions that have written their commit entry in the log must also have recorded all their write operations in the log; otherwise they would not be committed, so their effect on the database can be r ...
... Transaction and System Concepts Commit Point of a Transaction (cont): • Redoing transactions: • Transactions that have written their commit entry in the log must also have recorded all their write operations in the log; otherwise they would not be committed, so their effect on the database can be r ...
Group-based Replication of On-line Transaction Processing Servers*
... version with that of t: if they match t commits, otherwise t’s read-set and write-set are checked against the write-sets of all transactions committed locally since t’s database version. If they do not intersect, t commits, otherwise t aborts. If t commits then its state changes are applied through ...
... version with that of t: if they match t commits, otherwise t’s read-set and write-set are checked against the write-sets of all transactions committed locally since t’s database version. If they do not intersect, t commits, otherwise t aborts. If t commits then its state changes are applied through ...
Database
... • DBA can enforce standard naming conventions, etc • reduced application development time • adding new functionality to an existing database is “easy” • flexibility • adding new data and making some types of changes is “easy” ...
... • DBA can enforce standard naming conventions, etc • reduced application development time • adding new functionality to an existing database is “easy” • flexibility • adding new data and making some types of changes is “easy” ...
Slides
... • In production environments, it is unlikely that we can limit our system to just one user at a time. – Consequently, it is possible for multiple queries or transactions to be submitted at approximately the same time. • If all of the queries were very small (i.e., in terms of time), we could probabl ...
... • In production environments, it is unlikely that we can limit our system to just one user at a time. – Consequently, it is possible for multiple queries or transactions to be submitted at approximately the same time. • If all of the queries were very small (i.e., in terms of time), we could probabl ...
Highly Available Transactions: Virtues and
... the many previously proposed database isolation and data consistency models to the goal of high availability, which guarantees a response from each non-failing server in the presence of arbitrary network partitions between them. We classify which among the wide array of models are achievable with hi ...
... the many previously proposed database isolation and data consistency models to the goal of high availability, which guarantees a response from each non-failing server in the presence of arbitrary network partitions between them. We classify which among the wide array of models are achievable with hi ...
View File - UET Taxila
... yet written to the disks) are written from memory to the disk storage, ensuring that all changes made prior to taking checkpoint have been written to long-term storage. DBMS may perform checkpoints automatically or in response to user application programs. Checkpoints should be taken frequently (sev ...
... yet written to the disks) are written from memory to the disk storage, ensuring that all changes made prior to taking checkpoint have been written to long-term storage. DBMS may perform checkpoints automatically or in response to user application programs. Checkpoints should be taken frequently (sev ...
CNAF Database Service - Indico
... Necessary to create a production environment which has to be high available, fault tolerant and responsive. At the same time we need to centralize the administration of some databases which are now scattered on many different servers, this increase the administration time and the probability of mist ...
... Necessary to create a production environment which has to be high available, fault tolerant and responsive. At the same time we need to centralize the administration of some databases which are now scattered on many different servers, this increase the administration time and the probability of mist ...
