Chapter 10: Creating and Maintaining Geographic Databases
... is an organized collection of data on a particular theme Object classes are stored in a standard database table, a twodimensional array of rows and columns. ...
... is an organized collection of data on a particular theme Object classes are stored in a standard database table, a twodimensional array of rows and columns. ...
Slide 18
... There are many variations of two-phase locking algorithm. Some avoid deadlock by not letting the cycle to complete. That is as soon as the algorithm discovers that blocking a transaction is likely to create a cycle, it rolls back the transaction. Wound-Wait and Wait-Die algorithms use timestamps to ...
... There are many variations of two-phase locking algorithm. Some avoid deadlock by not letting the cycle to complete. That is as soon as the algorithm discovers that blocking a transaction is likely to create a cycle, it rolls back the transaction. Wound-Wait and Wait-Die algorithms use timestamps to ...
CH06
... 2. Subtract $100 from account 123 Atomicity: Certain combinations of database operations need to be done atomically; that is, either they are both done or neither is done. ...
... 2. Subtract $100 from account 123 Atomicity: Certain combinations of database operations need to be done atomically; that is, either they are both done or neither is done. ...
Overview of Transaction Management
... tries to update a row which was already updated by a concurrent transaction T1, then T2 gets blocked until T1 has either committed or aborted Nearly same as 2PL/RC, though all reads occur effectively at the same time for the statement. ...
... tries to update a row which was already updated by a concurrent transaction T1, then T2 gets blocked until T1 has either committed or aborted Nearly same as 2PL/RC, though all reads occur effectively at the same time for the statement. ...
presentation source - Courses
... database, DA and DBA are responsible for developing procedures that ensure the integrity and security of the database during the update process. • Specific responsibility for data collection, editing and verification must be assigned • Quality assurance must be practiced to protect and audit the dat ...
... database, DA and DBA are responsible for developing procedures that ensure the integrity and security of the database during the update process. • Specific responsibility for data collection, editing and verification must be assigned • Quality assurance must be practiced to protect and audit the dat ...
pdf
... Durability requirement — once the user has been notified that the transaction has completed (i.e., the transfer of the $10000 has taken place), the updates to the database by the transaction must persist despite failures. Isolation requirement — if between steps 3 and 6, another transaction is all ...
... Durability requirement — once the user has been notified that the transaction has completed (i.e., the transfer of the $10000 has taken place), the updates to the database by the transaction must persist despite failures. Isolation requirement — if between steps 3 and 6, another transaction is all ...
Compellent Tech Tip
... The quiesce database command, used with the hold keyword, suspends all updates to a user-specified list of one or more databases (8 databases is the maximum for one command). Transactions are then prevented from updating the persistent store of data in suspended databases, and background tasks such ...
... The quiesce database command, used with the hold keyword, suspends all updates to a user-specified list of one or more databases (8 databases is the maximum for one command). Transactions are then prevented from updating the persistent store of data in suspended databases, and background tasks such ...
Lecture 4.6.2011 - Databases Part 1
... In VB, Data Manipulation handled by Language-Integrated Query (LINQ) and Structured Query Language (SQL); called LINQ to SQL SQL is the language of most databases Language-Integrated Query (LINQ) programming implementation that allows SQL statements to be integrated into a VB program ...
... In VB, Data Manipulation handled by Language-Integrated Query (LINQ) and Structured Query Language (SQL); called LINQ to SQL SQL is the language of most databases Language-Integrated Query (LINQ) programming implementation that allows SQL statements to be integrated into a VB program ...
ch15
... A transaction is structured such that its writes are all performed at the end of its processing All writes of a transaction form an atomic action; no transaction may execute while a transaction is being written A transaction that aborts is restarted with a new timestamp Solution 2: Limited form of l ...
... A transaction is structured such that its writes are all performed at the end of its processing All writes of a transaction form an atomic action; no transaction may execute while a transaction is being written A transaction that aborts is restarted with a new timestamp Solution 2: Limited form of l ...
15. Concurrency Control
... to wait for T3 to release its lock on B, while executing lock-X(A) causes T3 to wait for T4 to release its lock on A. Such a situation is called a deadlock. To handle a deadlock one of T3 or T4 must be rolled back and its locks released. ...
... to wait for T3 to release its lock on B, while executing lock-X(A) causes T3 to wait for T4 to release its lock on A. Such a situation is called a deadlock. To handle a deadlock one of T3 or T4 must be rolled back and its locks released. ...
Transaction
... Isolation example: If two or more people try to buy the last copy of a product, just ...
... Isolation example: If two or more people try to buy the last copy of a product, just ...
Estimating the Robustness of Discovered Knowledge*
... is in a state that is consistent with r. The robustness of r is Robust(r) = Pr(D). This probability can be estimated by the ratio between the number of all possible database states and the number of database states consistent with a rule. That is, # of database states consistent with r Robust(r) = # ...
... is in a state that is consistent with r. The robustness of r is Robust(r) = Pr(D). This probability can be estimated by the ratio between the number of all possible database states and the number of database states consistent with a rule. That is, # of database states consistent with r Robust(r) = # ...
ADVANCED SQL AND PL/SQL TOPICS
... concentrate on requesting and presenting data managed by the server portion • The server portion runs oracle software and handles the functions required for shared data access • The server receives and processes the SQL statements that comes from the client applications • The computer that manages t ...
... concentrate on requesting and presenting data managed by the server portion • The server portion runs oracle software and handles the functions required for shared data access • The server receives and processes the SQL statements that comes from the client applications • The computer that manages t ...
FACT SHEET MANAGED SERVICES FOR DATABASES
... Fujitsu AMS shall take complete ownership of your database portfolio, allowing you to focus on new projects in applications and infrastructure. An embedded continuous improvement program will continue to drive down operating expenses over time so that you will be able to undertake additional strateg ...
... Fujitsu AMS shall take complete ownership of your database portfolio, allowing you to focus on new projects in applications and infrastructure. An embedded continuous improvement program will continue to drive down operating expenses over time so that you will be able to undertake additional strateg ...
T - VUB STAR lab
... hence no waits. Instead there are rollbacks. In order to ensure such behavior, the protocol maintains for each data item Q two timestamp values: W-timestamp(Q) is the latest (youngest, largest) time-stamp of any transaction that executed write(Q) successfully. R-timestamp(Q) is the latest time ...
... hence no waits. Instead there are rollbacks. In order to ensure such behavior, the protocol maintains for each data item Q two timestamp values: W-timestamp(Q) is the latest (youngest, largest) time-stamp of any transaction that executed write(Q) successfully. R-timestamp(Q) is the latest time ...
Concurrency_Control_Techniques
... Tj completes its write phase before Ti starts its read phase. Ti starts its write phase after Tj completes its write phase, and the read_set of Ti has no items in common with the write_set of Tj Both the read_set and write_set of Ti have no items in common with the write_set of Tj, and Tj completes ...
... Tj completes its write phase before Ti starts its read phase. Ti starts its write phase after Tj completes its write phase, and the read_set of Ti has no items in common with the write_set of Tj Both the read_set and write_set of Ti have no items in common with the write_set of Tj, and Tj completes ...
Not All Database Security Solutions Are Created Equal
... application/database performance—A database security solution cannot slow down businesscritical database services. Solutions that force you to compromise and disable certain features so as to reduce the database performance impact or reduce your network load can be counterproductive. ...
... application/database performance—A database security solution cannot slow down businesscritical database services. Solutions that force you to compromise and disable certain features so as to reduce the database performance impact or reduce your network load can be counterproductive. ...
Databases
... • There is hardly a person in America who is not in at least one computer database • When a database security breach occurs in a legitimate organization, its customers lose confidence and might take their business elsewhere Chapter 11: Databases ...
... • There is hardly a person in America who is not in at least one computer database • When a database security breach occurs in a legitimate organization, its customers lose confidence and might take their business elsewhere Chapter 11: Databases ...
Recovery
... Database can be recovered using after-images since the last checkpoint Checkpoint can be done several times per hour ...
... Database can be recovered using after-images since the last checkpoint Checkpoint can be done several times per hour ...
View/Open - Pan Africa Christian University
... VI.KleanIT Solutions Limited has employed intends to automate order processing of computer items requested by their clients. Each of the client order can request for several items, while an item in high demand can be requested in many order: a. Draw an entity relationship diagram that would be used ...
... VI.KleanIT Solutions Limited has employed intends to automate order processing of computer items requested by their clients. Each of the client order can request for several items, while an item in high demand can be requested in many order: a. Draw an entity relationship diagram that would be used ...
CS2255 Data Base Management Systems Ms.S
... Transaction Concepts - Transaction Recovery – ACID Properties – System Recovery – Media Recovery – Two Phase Commit - Save Points – SQL Facilities for recovery – Concurrency – Need for Concurrency – Locking Protocols – Two Phase Locking – Intent Locking – Deadlock- Serializability – Recovery Isolati ...
... Transaction Concepts - Transaction Recovery – ACID Properties – System Recovery – Media Recovery – Two Phase Commit - Save Points – SQL Facilities for recovery – Concurrency – Need for Concurrency – Locking Protocols – Two Phase Locking – Intent Locking – Deadlock- Serializability – Recovery Isolati ...