INFO2120/2820 Database Systems I: Transactions
... A sequence of database operations is serializable if it is equivalent to a serial execution of the involved transactions Central Theorem of concurrent execution in DBMS: A serializable execution guarantees correctness in that it moves a database from one consistent state to another consistent st ...
... A sequence of database operations is serializable if it is equivalent to a serial execution of the involved transactions Central Theorem of concurrent execution in DBMS: A serializable execution guarantees correctness in that it moves a database from one consistent state to another consistent st ...
Presentation
... • Elements added to queries in order for the global join to be executed in Unity Driver. ...
... • Elements added to queries in order for the global join to be executed in Unity Driver. ...
Kroenke-DBP-e10-PPT-Chapter09
... transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately • Two-phased locking is one of the techniques used to achieve serializability ...
... transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately • Two-phased locking is one of the techniques used to achieve serializability ...
The Java Crypto API
... Retrieving data using SQL and JDBC Using SQL to update the database Using a result set to update the database ...
... Retrieving data using SQL and JDBC Using SQL to update the database Using a result set to update the database ...
COMMIT - Telkom University
... the value originally selected. Each transactions is unaware of other transactions. The last update overwrites updates made by the other transactions, which results in lost data. A's update of 300 votes was over written by B's update to the table. This is also known as a non-repeatable read, since at ...
... the value originally selected. Each transactions is unaware of other transactions. The last update overwrites updates made by the other transactions, which results in lost data. A's update of 300 votes was over written by B's update to the table. This is also known as a non-repeatable read, since at ...
IT344TestBankandMultipleChoiceQuestions (1)
... b. Suggest how to perform the read to improve the transfer rate from the RAID system. 17.7 In a slotted page architecture, objects (tuples) are accessed indirectly via a header table at the beginning of the page. That is, a tuple id gives a page-id and an offset in the header table. Each entry in th ...
... b. Suggest how to perform the read to improve the transfer rate from the RAID system. 17.7 In a slotted page architecture, objects (tuples) are accessed indirectly via a header table at the beginning of the page. That is, a tuple id gives a page-id and an offset in the header table. Each entry in th ...
Database Administration Presentation
... Forward recovery. Also called “rollforward” recovery. Used to recover accurate transactions and apply them to the database. Imagine that the current database is inaccurate. This database must be replaced with a prior, consistent version of the database before forward recovery can begin. After-im ...
... Forward recovery. Also called “rollforward” recovery. Used to recover accurate transactions and apply them to the database. Imagine that the current database is inaccurate. This database must be replaced with a prior, consistent version of the database before forward recovery can begin. After-im ...
National Academy for Software Development
... • Conflicting operations • Two operations conflict if they 1) are from different transactions 2) access the same item, and 3) at least one of the transactions does a write operation to that item ...
... • Conflicting operations • Two operations conflict if they 1) are from different transactions 2) access the same item, and 3) at least one of the transactions does a write operation to that item ...
Section-9x
... • Equivalent schedules: For any storage/database state, the effect (on storage/database) and output of executing the first schedule is identical to the effect of executing the second schedule • Serializable schedule: A schedule that is equivalent to some serial execution of the transactions – Intuit ...
... • Equivalent schedules: For any storage/database state, the effect (on storage/database) and output of executing the first schedule is identical to the effect of executing the second schedule • Serializable schedule: A schedule that is equivalent to some serial execution of the transactions – Intuit ...
Database Schema Diagrams
... The internal PaperCut database is stable, scalable, self-maintaining and provides very good performance. For this reason most organizations do not need to run PaperCut on an external database system. However there are some good reasons to run PaperCut on an external RDBMS, including: ...
... The internal PaperCut database is stable, scalable, self-maintaining and provides very good performance. For this reason most organizations do not need to run PaperCut on an external database system. However there are some good reasons to run PaperCut on an external RDBMS, including: ...
How to use "_allow_resetlogs_corruption"
... started.Total System Global Area xxx bytesFixed Size xxx bytes Variable Size xxx bytes Database Buffers xxx bytes ...
... started.Total System Global Area xxx bytesFixed Size xxx bytes Variable Size xxx bytes Database Buffers xxx bytes ...
Concurrency Control in Distributed Databases
... Making them wait could interfere with other transactions since ...
... Making them wait could interfere with other transactions since ...
Performance
... Keeping frequently used data in memory reduces disk accesses, reducing number of disks required, but has a memory cost ...
... Keeping frequently used data in memory reduces disk accesses, reducing number of disks required, but has a memory cost ...
Slide Template - Gunadarma University
... Support the fewest network protocols possible Delete unnecessary or unused system stored procedures Disable default logins and guest users, if possible Unless required, never allow all users to log on to the DBMS ...
... Support the fewest network protocols possible Delete unnecessary or unused system stored procedures Disable default logins and guest users, if possible Unless required, never allow all users to log on to the DBMS ...
ORA10G201-VER2 Oracle Database 10g: Administration I (5 days
... • Operating system-specific considerations for Unix, Linux and MS Windows. Target Audience The target audience for this course is Oracle database administrators. Additionally, senior database developers will benefit from an understanding of the architecture of the Oracle database with which they int ...
... • Operating system-specific considerations for Unix, Linux and MS Windows. Target Audience The target audience for this course is Oracle database administrators. Additionally, senior database developers will benefit from an understanding of the architecture of the Oracle database with which they int ...
50401A-ENU_Powerpnt_08
... Reader/writer blocking occurs to the point that concurrency benefits outweigh increased overhead of creating and managing row versions An application requires absolute accuracy for long-running aggregations or queries where data values must be consistent to the point in time that a query starts ...
... Reader/writer blocking occurs to the point that concurrency benefits outweigh increased overhead of creating and managing row versions An application requires absolute accuracy for long-running aggregations or queries where data values must be consistent to the point in time that a query starts ...
Database Management Systems (DMS)
... records or files consolidated into a common pool that provides data for one or more multiple uses. You can think of a database as an electronic filing system. Database Management System (DBMS) Software that organizes the storage of data. A DBMS controls the creation, maintenance, and use of the data ...
... records or files consolidated into a common pool that provides data for one or more multiple uses. You can think of a database as an electronic filing system. Database Management System (DBMS) Software that organizes the storage of data. A DBMS controls the creation, maintenance, and use of the data ...
Query Processing - Department of Computer Science
... with A. Furthermore, the need for T to set a lock on A prevents T from accessing A if some other transaction is already using A. T must wait until the other transaction unlocks A, which it should do only after finishing with A. ...
... with A. Furthermore, the need for T to set a lock on A prevents T from accessing A if some other transaction is already using A. T must wait until the other transaction unlocks A, which it should do only after finishing with A. ...
Chapter 20: Advanced Transaction Processing
... Execution of workflows - execute transactions specified in the workflow while also providing traditional database safeguards related to the correctness of computations, data integrity, and durability. E.g.: Loan application should not get lost even if system fails. Extend transaction concepts ...
... Execution of workflows - execute transactions specified in the workflow while also providing traditional database safeguards related to the correctness of computations, data integrity, and durability. E.g.: Loan application should not get lost even if system fails. Extend transaction concepts ...
The Hobgoblin of Little Minds
... In the serializable isolation level, transactions must execute in such a way that they appear to be executed one at a time (“serially”), rather than concurrently. […] In other words, concurrent transactions executing in serializable mode are only permitted to make database changes they could have ma ...
... In the serializable isolation level, transactions must execute in such a way that they appear to be executed one at a time (“serially”), rather than concurrently. […] In other words, concurrent transactions executing in serializable mode are only permitted to make database changes they could have ma ...
Recovery in Parallel Database Systems
... permanent even if a failure occurs after the commitment. Once a transaction completes successfully(commits), its changes to the state survive failures. ...
... permanent even if a failure occurs after the commitment. Once a transaction completes successfully(commits), its changes to the state survive failures. ...
Distributed Databases
... Each site surrenders part of its autonomy in terms of right to change schemas or software Appears to user as a single system ...
... Each site surrenders part of its autonomy in terms of right to change schemas or software Appears to user as a single system ...
Oracle Database Administrator 720 10.09 Location: Madison, WI
... Coordinates physical changes to computer databases Codes, tests, and implements physical database, applying knowledge of database management systems Designs logical and physical databases Reviews description of changes to database design to understand how changes to be made affect physical database ...
... Coordinates physical changes to computer databases Codes, tests, and implements physical database, applying knowledge of database management systems Designs logical and physical databases Reviews description of changes to database design to understand how changes to be made affect physical database ...
Distributed Transactions
... UNDO transactions that were in the middle of execution at time of crash (abort) REDO transactions that were committed before crash but for which updates might not be reflected in DB on disk Disk failure solved by replication: database backups, mirrored disks, etc. Durability often combined with avai ...
... UNDO transactions that were in the middle of execution at time of crash (abort) REDO transactions that were committed before crash but for which updates might not be reflected in DB on disk Disk failure solved by replication: database backups, mirrored disks, etc. Durability often combined with avai ...