Lecture 1 - Department of Computer Science
... IMS from IBM, Hierarchical Data Model IMS DB/DC, Network Model and communication SABRE, multi-user access with network ...
... IMS from IBM, Hierarchical Data Model IMS DB/DC, Network Model and communication SABRE, multi-user access with network ...
transaction
... Repeatable read — only committed records to be read, repeated reads of same record must return same value. However, a transaction may not be serializable – it may find some records inserted by a transaction but not find others. Read committed — only committed records can be read, but successive read ...
... Repeatable read — only committed records to be read, repeated reads of same record must return same value. However, a transaction may not be serializable – it may find some records inserted by a transaction but not find others. Read committed — only committed records can be read, but successive read ...
On-line Analytical Processing with Oracle Database 12c
... When query patterns are predictable, it is relatively easy to optimize query performance of an application by pre-calculating data that satisfies particular queries. If, for example, a BI dashboard contains twenty different queries it might be reasonable to create summary tables or table-based mater ...
... When query patterns are predictable, it is relatively easy to optimize query performance of an application by pre-calculating data that satisfies particular queries. If, for example, a BI dashboard contains twenty different queries it might be reasonable to create summary tables or table-based mater ...
Oracle Backup and Recovery Guide
... files, if a backup copy of a data file from some point in time and a complete set of redo logs from that time forward are available, the database can apply changes recorded in the redo logs, in order to reconstruct the data file contents at any point between the backup time and the end of the last ...
... files, if a backup copy of a data file from some point in time and a complete set of redo logs from that time forward are available, the database can apply changes recorded in the redo logs, in order to reconstruct the data file contents at any point between the backup time and the end of the last ...
A Collaborative Approach for Caching Dynamic Data in
... As mentioned earlier, due to the potentially large number of providers and dynamicity of the environment, it is not feasible to identify “cache-worthy” objects on the portal, either by a system administrator or by mining server logs: a human administrator cannot handle frequent changes to the collec ...
... As mentioned earlier, due to the potentially large number of providers and dynamicity of the environment, it is not feasible to identify “cache-worthy” objects on the portal, either by a system administrator or by mining server logs: a human administrator cannot handle frequent changes to the collec ...
ppt - Fordham University Computer and Information Sciences
... Application program interface (e.g., ODBC/JDBC) which allow SQL queries to be sent to a database ...
... Application program interface (e.g., ODBC/JDBC) which allow SQL queries to be sent to a database ...
Towards an Infrastructure for Temporal Databases: Report of an
... query optimization, in part because there is no commonly accepted consensus data model or query language upon which to base research and development. At a more fundamental level, even the terminology is highly nonstandard. As an example, the terms intrinsic time, logical time, real-world time, and v ...
... query optimization, in part because there is no commonly accepted consensus data model or query language upon which to base research and development. At a more fundamental level, even the terminology is highly nonstandard. As an example, the terms intrinsic time, logical time, real-world time, and v ...
Hybrid Row-Column Partitioning in Teradata
... partitioned tables. Lastly, we show the results of a performance study conducted to examine the impact of different partitioning choices. Teradata Database is a shared-nothing architecture [25] that can be deployed to Massively Parallel Processing (MPP) systems1 [7]. The architecture contains two typ ...
... partitioned tables. Lastly, we show the results of a performance study conducted to examine the impact of different partitioning choices. Teradata Database is a shared-nothing architecture [25] that can be deployed to Massively Parallel Processing (MPP) systems1 [7]. The architecture contains two typ ...
PPT
... of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints And as we will see later, also other information such as ...
... of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints And as we will see later, also other information such as ...
Introduction to SQL
... involving the operation, +, –, , and /, and operating on constants or attributes of tuples. ...
... involving the operation, +, –, , and /, and operating on constants or attributes of tuples. ...
Layered Temporal DBMS`s - Concepts and Techniques
... of legacy code is not affected when temporal support is adopted. In addition, it is desirable that a language permits for incremental exploitation of the temporal support. When a temporal language is first adopted, no existing application code takes advantage of the temporal features. Only when conv ...
... of legacy code is not affected when temporal support is adopted. In addition, it is desirable that a language permits for incremental exploitation of the temporal support. When a temporal language is first adopted, no existing application code takes advantage of the temporal features. Only when conv ...
Starting with Java Persistence Architecture
... commercial projects created Java libraries that allowed simpler persistence models; these projects include JDO, Kodo, Hibernate and others. Any of those libraries could be used for persistence, but they were not standard reference implementations. The JPA represents the next generation; it benefits ...
... commercial projects created Java libraries that allowed simpler persistence models; these projects include JDO, Kodo, Hibernate and others. Any of those libraries could be used for persistence, but they were not standard reference implementations. The JPA represents the next generation; it benefits ...
Oracle Database 12c Essentials Exam Study Guide
... LGWR puts the commit record to Redo Log Buffer. LGWR signals the database writer (DBW) process to write dirty blocks to disk. LGWR writes all redo entries from Redo Log Buffer to disk. ...
... LGWR puts the commit record to Redo Log Buffer. LGWR signals the database writer (DBW) process to write dirty blocks to disk. LGWR writes all redo entries from Redo Log Buffer to disk. ...
1 - MIS
... For most queries, the asterisk (*) should not be used to specify column names. In general, you process results by knowing in advance the order of the columns in the result—for example, selecting authorID and lastName from table authors ensures that the columns will appear in the result with authorID ...
... For most queries, the asterisk (*) should not be used to specify column names. In general, you process results by knowing in advance the order of the columns in the result—for example, selecting authorID and lastName from table authors ensures that the columns will appear in the result with authorID ...
Leveraging Oracle Business Intelligence Tools with the OLAP optio
... The process of querying multidimensional data sets using the OLAP_TABLE table function can be made completely transparent to the client application. Or, the application can be aware that the source of the data is multidimensional and leverage this knowledge by interacting with the multidimensional e ...
... The process of querying multidimensional data sets using the OLAP_TABLE table function can be made completely transparent to the client application. Or, the application can be aware that the source of the data is multidimensional and leverage this knowledge by interacting with the multidimensional e ...
Toward Context and Preference-Aware Location
... The rigidness of such an approach is due to two main reasons: (1) The lack of personalized customer services. For example, if two persons asking the same query in the same location, they will get the same answer, even if their personal preferences are different. (2) The lack of context awareness as ...
... The rigidness of such an approach is due to two main reasons: (1) The lack of personalized customer services. For example, if two persons asking the same query in the same location, they will get the same answer, even if their personal preferences are different. (2) The lack of context awareness as ...
Transactions
... database restored to its state prior to the start of the transaction. Two options after it has been aborted: ...
... database restored to its state prior to the start of the transaction. Two options after it has been aborted: ...
Information paper database recovery
... messages that were actually sent (but where the ACK has not been received by the back office) from the messages that were in Access but not yet sent. In summary, it is possible for the customer to implement procedures recovering lost operational data. This recovery process is however complex to impl ...
... messages that were actually sent (but where the ACK has not been received by the back office) from the messages that were in Access but not yet sent. In summary, it is possible for the customer to implement procedures recovering lost operational data. This recovery process is however complex to impl ...
ppt
... Every cascadeless schedule is also recoverable It is desirable to restrict the schedules to those that are ...
... Every cascadeless schedule is also recoverable It is desirable to restrict the schedules to those that are ...
Spring 2002 Transaction Information Systems
... Transaction State • Active, the initial state; the transaction stays in this state while it is executing • Partially committed, after the final statement has been executed. • Failed, after the discovery that normal execution can no longer proceed. • Aborted, after the transaction has been rolled ba ...
... Transaction State • Active, the initial state; the transaction stays in this state while it is executing • Partially committed, after the final statement has been executed. • Failed, after the discovery that normal execution can no longer proceed. • Aborted, after the transaction has been rolled ba ...