Global Payroll Performance Optimisation
... • Multiple streams insert data simultaneously into the same data blocks in result tables. • Payroll cancel/recalculation deletes from result tables. • Multiple transactions concurrently update different rows in the same block. – On Oracle/SQL Server >=2005: No locking, streams continue to run, but r ...
... • Multiple streams insert data simultaneously into the same data blocks in result tables. • Payroll cancel/recalculation deletes from result tables. • Multiple transactions concurrently update different rows in the same block. – On Oracle/SQL Server >=2005: No locking, streams continue to run, but r ...
Remote-Backup
... Need to flush every updated page, and page table Data gets fragmented (related pages get separated on disk) After every transaction completion, the database pages containing old versions of modified data need to be garbage collected Hard to extend algorithm to allow transactions to run concu ...
... Need to flush every updated page, and page table Data gets fragmented (related pages get separated on disk) After every transaction completion, the database pages containing old versions of modified data need to be garbage collected Hard to extend algorithm to allow transactions to run concu ...
Remote Backup Systems
... Need to flush every updated page, and page table Data gets fragmented (related pages get separated on disk) After every transaction completion, the database pages containing old versions of modified data need to be garbage collected Hard to extend algorithm to allow transactions to run concu ...
... Need to flush every updated page, and page table Data gets fragmented (related pages get separated on disk) After every transaction completion, the database pages containing old versions of modified data need to be garbage collected Hard to extend algorithm to allow transactions to run concu ...
Orphaned MSDTC transactions (-2 spids).
... The above will work in SQL Server 2000 onward, but from SQL Server 2005, it’s more politically correct to use the DMVs, so the table and column names have changed slightly: select request_owner_guid as [UoW ID] from sys.dm_tran_locks where request_session_id = -2 ...
... The above will work in SQL Server 2000 onward, but from SQL Server 2005, it’s more politically correct to use the DMVs, so the table and column names have changed slightly: select request_owner_guid as [UoW ID] from sys.dm_tran_locks where request_session_id = -2 ...
Document Scope - Database Security Systems
... databases should have mirrored groups of on-line redo logs. Members of the same group should be placed on different file systems so that no single disk failure can cause the database instance to fail. Each redo log in a group shall be named redonna.log where nn is a sequential number, and a is an al ...
... databases should have mirrored groups of on-line redo logs. Members of the same group should be placed on different file systems so that no single disk failure can cause the database instance to fail. Each redo log in a group shall be named redonna.log where nn is a sequential number, and a is an al ...
Document
... precedence graph is acyclic. Cycle-detection algorithms exist which take order n2 time, where n is the number of vertices in the graph. (Better algorithms take order n + e where e is the number of edges.) If precedence graph is acyclic, the serializability order can be obtained by a topological ...
... precedence graph is acyclic. Cycle-detection algorithms exist which take order n2 time, where n is the number of vertices in the graph. (Better algorithms take order n + e where e is the number of edges.) If precedence graph is acyclic, the serializability order can be obtained by a topological ...
Document
... Gray and Reuter [ibid. pp. 402] outline the concurrency control mechanisms needed to implement queues within a database: Read_Past locks allow a program to skip over dirty (uncommitted records) to find the first committed record. This is what a dequeue() operation wants. Read_Through locks allow a p ...
... Gray and Reuter [ibid. pp. 402] outline the concurrency control mechanisms needed to implement queues within a database: Read_Past locks allow a program to skip over dirty (uncommitted records) to find the first committed record. This is what a dequeue() operation wants. Read_Through locks allow a p ...
transparencies - Indico
... production release cannot be expected to work against the development or integration databases. At some point, the build managers will declare a code freeze, tagging libraries, etc. Code frozen from the development area will initially be pointed to the integration area for user testing. Users may th ...
... production release cannot be expected to work against the development or integration databases. At some point, the build managers will declare a code freeze, tagging libraries, etc. Code frozen from the development area will initially be pointed to the integration area for user testing. Users may th ...
Theme: Database Transactions in theory and in practice
... distributed transaction management facility of the DBMS product by bracketing the business transaction with transaction begin and commit. The assumption clearly is that the databases are now aware of each other and function as one distributed database. This approach may not allow multiple COTS softw ...
... distributed transaction management facility of the DBMS product by bracketing the business transaction with transaction begin and commit. The assumption clearly is that the databases are now aware of each other and function as one distributed database. This approach may not allow multiple COTS softw ...
Document
... transaction must hold all its exclusive locks till it commits/aborts. Rigorous two-phase locking is even stricter: here all locks are held ...
... transaction must hold all its exclusive locks till it commits/aborts. Rigorous two-phase locking is even stricter: here all locks are held ...
Database Users and Administrators
... database. For example, online library system, ticket booking systems, ATMs etc which has existing application and users use them to interact with the database to fulfill their requests. ...
... database. For example, online library system, ticket booking systems, ATMs etc which has existing application and users use them to interact with the database to fulfill their requests. ...
Database management system Document Notes
... A database is an integrated collection of logically related 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. A Database Management System (DBMS) Software that organizes the storage of data. ...
... A database is an integrated collection of logically related 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. A Database Management System (DBMS) Software that organizes the storage of data. ...
Chapter 15 Duplicating Databases and Transporting Data
... Duplicating Databases and Transporting Data ...
... Duplicating Databases and Transporting Data ...
Relational Database Design
... Conversion to 3NF • Create separate table(s) to eliminate transitive functional dependencies ...
... Conversion to 3NF • Create separate table(s) to eliminate transitive functional dependencies ...
Automated Resolution of Semantic Heterogeneity in
... • Global users essentially see a single, large, integrated database Problems: • The amount of global knowledge. A global schema can be a very large data object • The global DBA must understand all the local optimizations • Changes to local schemas must be reflected by the global schema. ...
... • Global users essentially see a single, large, integrated database Problems: • The amount of global knowledge. A global schema can be a very large data object • The global DBA must understand all the local optimizations • Changes to local schemas must be reflected by the global schema. ...
Database Duplicity in Nigeria: Any Hope for Harmonization
... hope for blacks but one of constant embarrassment and public about the edge the new system would have over the resentment. database being built by the FRSC virtually for the same Onakoya (2011) defined “a national database is an purpose. organized data or numerical environment where every Therefore, ...
... hope for blacks but one of constant embarrassment and public about the edge the new system would have over the resentment. database being built by the FRSC virtually for the same Onakoya (2011) defined “a national database is an purpose. organized data or numerical environment where every Therefore, ...
Introduction to Databases Lecture 1 Chapters 1 - 2 Robb T. Koether
... More significantly, Alice, an airline employee goes online to select a list of passengers on flight #123. At the very same time, Bob, another airline employee, goes online to change the flight number from #123 to #456. Alice selects the first 50 names of passengers on flight #123. At that moment, th ...
... More significantly, Alice, an airline employee goes online to select a list of passengers on flight #123. At the very same time, Bob, another airline employee, goes online to change the flight number from #123 to #456. Alice selects the first 50 names of passengers on flight #123. At that moment, th ...
06-Chapter-19-Database-Recovery
... system: the committed transactions since the last checkpoint and the active transactions. 2. Undo all the write_item operations of the active (uncommitted) transactions, using the UNDO procedure. The operations should be undone in the reverse of the order in which they were written into the log. 3. ...
... system: the committed transactions since the last checkpoint and the active transactions. 2. Undo all the write_item operations of the active (uncommitted) transactions, using the UNDO procedure. The operations should be undone in the reverse of the order in which they were written into the log. 3. ...
Introduction to Database Development
... with the tables and queries in a database However, it’s unlikely that you would want the end-users of your database to work with those tables and queries The users of the GCUTours system, for example, just want an easy way to book holidays ...
... with the tables and queries in a database However, it’s unlikely that you would want the end-users of your database to work with those tables and queries The users of the GCUTours system, for example, just want an easy way to book holidays ...
DBFarm: A Scalable Cluster for Multiple Databases
... determine how many different databases can be supported by that master and how high the overall transaction load can be. DBFarm reaches saturation once all masters reach the limit of update transaction streams they can process. At that point, and unless they submit exclusively read-only transaction ...
... determine how many different databases can be supported by that master and how high the overall transaction load can be. DBFarm reaches saturation once all masters reach the limit of update transaction streams they can process. At that point, and unless they submit exclusively read-only transaction ...
PPMA (Product Process Management Automation
... Installation and configuration of Oracle database and application servers based on the requirement. Deploying the new or updated oracle forms and reports in the production environment once it has been received from the development team. Creation of bat scripts to automate the database and appl ...
... Installation and configuration of Oracle database and application servers based on the requirement. Deploying the new or updated oracle forms and reports in the production environment once it has been received from the development team. Creation of bat scripts to automate the database and appl ...
Data Synchronization Between Two Securent Databases
... changed or formatted by a predefined set of rules before they are packaged into an LCR. Stage: LCRs are stored in the Staging environment until a subscriber picks them up to be used or consumed. The subscriber may be another staging environment or a user application. Apply: During the ‘apply/consump ...
... changed or formatted by a predefined set of rules before they are packaged into an LCR. Stage: LCRs are stored in the Staging environment until a subscriber picks them up to be used or consumed. The subscriber may be another staging environment or a user application. Apply: During the ‘apply/consump ...
Slide 1
... Facts and statistics collected together for reference or analysis Database It is an organized collection of data that is organized so that it can easily be accessed, managed, and updated Database Systems Database system is a system to achieve an organized, store a large number of dynamical associate ...
... Facts and statistics collected together for reference or analysis Database It is an organized collection of data that is organized so that it can easily be accessed, managed, and updated Database Systems Database system is a system to achieve an organized, store a large number of dynamical associate ...