Introduction to Database Systems
... Idea: If an action of Ti (say, writing X) affects Tj (which perhaps reads X), one of them, say Ti, will obtain the lock on X first and Tj is forced to wait until Ti completes; this effectively orders the transactions. What if Tj already has a lock on Y and Ti later requests a lock on Y? (Deadlock!) ...
... Idea: If an action of Ti (say, writing X) affects Tj (which perhaps reads X), one of them, say Ti, will obtain the lock on X first and Tj is forced to wait until Ti completes; this effectively orders the transactions. What if Tj already has a lock on Y and Ti later requests a lock on Y? (Deadlock!) ...
Database Version Control via Toad
... database to be out of compliance with its specification. One could argue that the latter scenario would unlikely happen in a well controlled production environment – however sometimes even the best run shops can experience this. Being able to catch this – and then to quickly and accurately restore t ...
... database to be out of compliance with its specification. One could argue that the latter scenario would unlikely happen in a well controlled production environment – however sometimes even the best run shops can experience this. Being able to catch this – and then to quickly and accurately restore t ...
Transaction Processing Systems
... Transaction logs – Historical details of transactions made. Restore TPS back to consistent state at anytime o In recovery, recommit completed transaction or incomplete transactions rolled back Documenting backup and recovery procedures – Various backup media used to maintain many backup copies made ...
... Transaction logs – Historical details of transactions made. Restore TPS back to consistent state at anytime o In recovery, recommit completed transaction or incomplete transactions rolled back Documenting backup and recovery procedures – Various backup media used to maintain many backup copies made ...
Database Development
... Database vs File Processing Main purpose of database Database Actors DBA, Database Designers, Database users, Application Programmer ...
... Database vs File Processing Main purpose of database Database Actors DBA, Database Designers, Database users, Application Programmer ...
OVERCOMING RELATIONAL DATABASE LIMITATIONS WITH NOSQL
... databases but instead provide solutions where relational databases are not a good fit. They are often classified as: 1. Key-value: As the name suggests, these databases are intended to store key-value pairs. Key-value databases are designed to be fast, trading durability for raw speed1. While in tr ...
... databases but instead provide solutions where relational databases are not a good fit. They are often classified as: 1. Key-value: As the name suggests, these databases are intended to store key-value pairs. Key-value databases are designed to be fast, trading durability for raw speed1. While in tr ...
jdbc - Villanova University
... queried using JDBC. The metadata associated with the result set object of a statement execution can also be queried. ...
... queried using JDBC. The metadata associated with the result set object of a statement execution can also be queried. ...
ch01
... great amount of disk space and internal memory. Also, because all the data that the database manages for you is stored in one file, the database file itself requires a large amount of disk space and internal memory. ...
... great amount of disk space and internal memory. Also, because all the data that the database manages for you is stored in one file, the database file itself requires a large amount of disk space and internal memory. ...
ppt
... Introduction: Comparison with other Relational Systems: It is the only relational system which provides a complete database management capabilities-including application programming, query capability, concurrent access support, system recovery etc. Other systems provide solutions to various speci ...
... Introduction: Comparison with other Relational Systems: It is the only relational system which provides a complete database management capabilities-including application programming, query capability, concurrent access support, system recovery etc. Other systems provide solutions to various speci ...
Overview of Triggers+DB : Opportunities and Issues
... No uniformity among trigger support in products Triggers simple : typically cannot encode complex conditions (optimization problem; poor performance) Typically, no time-based events Semantics: transactional; interrelationships; etc. Triggers aren’t scalable (one per table often, or so) Triggers diff ...
... No uniformity among trigger support in products Triggers simple : typically cannot encode complex conditions (optimization problem; poor performance) Typically, no time-based events Semantics: transactional; interrelationships; etc. Triggers aren’t scalable (one per table often, or so) Triggers diff ...
Proceedings of USITS ’03: 4th USENIX Symposium on Internet Technologies and Systems
... sent to all replicas, executed in order of their assigned sequence numbers, and held until commit, thus forcing all conflicting operations to execute in a total order identical at all replicas, and thus enforcing 1-copy serializability. Transactions consisting of a single read query are treated diff ...
... sent to all replicas, executed in order of their assigned sequence numbers, and held until commit, thus forcing all conflicting operations to execute in a total order identical at all replicas, and thus enforcing 1-copy serializability. Transactions consisting of a single read query are treated diff ...
Lesson04 Advanced SQL
... objects into a particular set of database files. Another advantage of filegroups is the ability to backup only a single filegroup at a time. Yet another advantage includes the ability to mark the filegroup and all data in the files that are part of it as either read-only or read-write. ...
... objects into a particular set of database files. Another advantage of filegroups is the ability to backup only a single filegroup at a time. Yet another advantage includes the ability to mark the filegroup and all data in the files that are part of it as either read-only or read-write. ...
here
... • Concurrency control ensures that one user’s actions do not adversely impact another user’s actions • At the core of concurrency is accessibility. In one extreme, data becomes inaccessible once a user touches the data. This ensures that data that is being considered for update is not shown. In the ...
... • Concurrency control ensures that one user’s actions do not adversely impact another user’s actions • At the core of concurrency is accessibility. In one extreme, data becomes inaccessible once a user touches the data. This ensures that data that is being considered for update is not shown. In the ...
Here - NYU Computer Science Department
... good!) choice of which tables to use and what should be their structure. Some sample problems with our design: Bad structures can lead to inconsistency or loss of data. ...
... good!) choice of which tables to use and what should be their structure. Some sample problems with our design: Bad structures can lead to inconsistency or loss of data. ...
Introduction to Database Systems
... • No central place to update the business logic • Security issues: Server needs to trust clients • Does not scale to more than several 100s of clients ...
... • No central place to update the business logic • Security issues: Server needs to trust clients • Does not scale to more than several 100s of clients ...
doc
... c. Subsume one of the relations into the other. d. All of the above will work. e. Take the primary key from both car and person and put them into a new relation called "owns". Mark: (1) 22. Which of the following is a good example of what is meant by serialisability. a. The situation where the Lost ...
... c. Subsume one of the relations into the other. d. All of the above will work. e. Take the primary key from both car and person and put them into a new relation called "owns". Mark: (1) 22. Which of the following is a good example of what is meant by serialisability. a. The situation where the Lost ...
Achieve Continuous Database Availability with Active
... Challenges in achieving a highly available system • Application availability depends on all components in the stack ...
... Challenges in achieving a highly available system • Application availability depends on all components in the stack ...
resource lock
... Deadlocks • As a transaction begins to lock resources, it may have to wait for a particular resource to be released by another transaction. On occasions, two transactions maybe indefinitely waiting on one another to release resources. This condition is known as a deadlock or a deadly embrace. ...
... Deadlocks • As a transaction begins to lock resources, it may have to wait for a particular resource to be released by another transaction. On occasions, two transactions maybe indefinitely waiting on one another to release resources. This condition is known as a deadlock or a deadly embrace. ...
IS431 Database System Design, Management and Applications
... modeling using the Entity-Relationship model, Semantic Object model and other data models; Relational Database Management Systems-functionality and design concepts and applications; querying a database; Structured Query Language; functional dependencies and higher order normalization for relational ...
... modeling using the Entity-Relationship model, Semantic Object model and other data models; Relational Database Management Systems-functionality and design concepts and applications; querying a database; Structured Query Language; functional dependencies and higher order normalization for relational ...
Ecogeography of Wild Relatives of Rice
... Progress to date is on schedule Development is iterative Changes to the database go through a ‘Change Control’ process ...
... Progress to date is on schedule Development is iterative Changes to the database go through a ‘Change Control’ process ...
CS 361-001 Database Systems, Dr. Wing Huen
... Only one make-up exam will be given. It will be a comprehensive exam given in the last week of semester. ATTENDANCE: Attendance is expected but not required. If you should miss a lecture for any reason, it is your responsibility to get the class notes from another (reliable) student. You should do t ...
... Only one make-up exam will be given. It will be a comprehensive exam given in the last week of semester. ATTENDANCE: Attendance is expected but not required. If you should miss a lecture for any reason, it is your responsibility to get the class notes from another (reliable) student. You should do t ...
3. Crosscutting Concerns in Database Systems
... while for another physical conversion may be essential. The choice is dictated by “local” organisational needs and at times custom variations of standard instance adaptation models can be required. The choice of instance adaptation approach may even vary from one application to another within the sa ...
... while for another physical conversion may be essential. The choice is dictated by “local” organisational needs and at times custom variations of standard instance adaptation models can be required. The choice of instance adaptation approach may even vary from one application to another within the sa ...
Database Systems: Design, Implementation, and Management
... DDBMS Components Computer workstations that form the network system. Network hardware and software components that reside in each workstation. Communications media that carry the data from one workstation to another. Transaction processor (TP) receives and processes the application’s data r ...
... DDBMS Components Computer workstations that form the network system. Network hardware and software components that reside in each workstation. Communications media that carry the data from one workstation to another. Transaction processor (TP) receives and processes the application’s data r ...
