Strategies and Techniques for Using Oracle7 Replication
... placed at that location. A plausible solution may be to buy a large, central server and some extremely robust network links between all locations. In general, replication should only be used if a client-server link to a central server provides inadequate performance, or if a measure of high-availabi ...
... placed at that location. A plausible solution may be to buy a large, central server and some extremely robust network links between all locations. In general, replication should only be used if a client-server link to a central server provides inadequate performance, or if a measure of high-availabi ...
Chapter 22
... participating sites must decide on T’s fate: If an active site contains a record in its log, then T must
be committed.
2. If an active site contains an record in its log, then T must
be aborted.
3. If some active participating site does not contain a record
in its log, ...
... participating sites must decide on T’s fate: If an active site contains a
How Oracle Database Manages Data Concurrency and Consistency
... Under some circumstances, Oracle Database can have insufficient history information to determine whether a row has been updated by a too recent transaction. This can occur when many transactions concurrently modify the same data block, or do so in a very short period. You can avoid this situation by ...
... Under some circumstances, Oracle Database can have insufficient history information to determine whether a row has been updated by a too recent transaction. This can occur when many transactions concurrently modify the same data block, or do so in a very short period. You can avoid this situation by ...
Document
... are permanently recorded within the database, it indicates successful end of transaction ROLLBACK statement is reached in which all changes are aborted and database is rolled back to ...
... are permanently recorded within the database, it indicates successful end of transaction ROLLBACK statement is reached in which all changes are aborted and database is rolled back to ...
SQuirreL, a Universal SQL Client by Gerd Wagner and Glenn Griffin
... DB updates can be made instantaneously, or they can be done within the context of a user-controlled transaction. The SQL tab (figure 2) supports general SQL operations. While the Objects tab is simple to use, it cannot handle complex operations. Examples of these would include multiple tables in a s ...
... DB updates can be made instantaneously, or they can be done within the context of a user-controlled transaction. The SQL tab (figure 2) supports general SQL operations. While the Objects tab is simple to use, it cannot handle complex operations. Examples of these would include multiple tables in a s ...
Document
... module is responsible for implementing a particular strategy for concurrency control. If a failure occurs during the transaction, then the database could be inconsistent. It is the task of the recovery manager to ensure that the database in consistent state. Finally, the buffer manager is responsibl ...
... module is responsible for implementing a particular strategy for concurrency control. If a failure occurs during the transaction, then the database could be inconsistent. It is the task of the recovery manager to ensure that the database in consistent state. Finally, the buffer manager is responsibl ...
Document
... 1. r, s must have the same arity (same number of attributes, same heading) 2. The attribute domains must be compatible (e.g., 2nd column of r deals with the same type of values as does the 2nd column of s) E.g. to find all customers with either an account or a loan ...
... 1. r, s must have the same arity (same number of attributes, same heading) 2. The attribute domains must be compatible (e.g., 2nd column of r deals with the same type of values as does the 2nd column of s) E.g. to find all customers with either an account or a loan ...
Client-server caching
... CB-Read, O2PL-ND come out best CB-Read implemented in EXODUS lower abort rate than O2PL-ND scales better with data contention ...
... CB-Read, O2PL-ND come out best CB-Read implemented in EXODUS lower abort rate than O2PL-ND scales better with data contention ...
No Slide Title
... 1. r, s must have the same arity (same number of attributes, same heading) 2. The attribute domains must be compatible (e.g., 2nd column of r deals with the same type of values as does the 2nd column of s) E.g. to find all customers with either an account or a loan ...
... 1. r, s must have the same arity (same number of attributes, same heading) 2. The attribute domains must be compatible (e.g., 2nd column of r deals with the same type of values as does the 2nd column of s) E.g. to find all customers with either an account or a loan ...
CSS122_WINTER09_LECTURE08
... Multi-Table DELETE Syntax There is a big problem in the last example. Multi-table delete can lead to orphaned records if misused (a foreign key with no primary key). DELETE P, D FROM People P JOIN XRefDirectorsMovies D ON P.PersonID = D.DirectorID; Jonathan Frakes is both an actor and a director. I ...
... Multi-Table DELETE Syntax There is a big problem in the last example. Multi-table delete can lead to orphaned records if misused (a foreign key with no primary key). DELETE P, D FROM People P JOIN XRefDirectorsMovies D ON P.PersonID = D.DirectorID; Jonathan Frakes is both an actor and a director. I ...
Oracle Archive Log with Data Guard
... Oracle Archive logs with DataGuard DR Solution provides business continuity for the applications that run on Oracle database. Data protection is done using DataGuard to copy log files and other DB related files between Production and DR (remote) sites. Since this whole process is automated using San ...
... Oracle Archive logs with DataGuard DR Solution provides business continuity for the applications that run on Oracle database. Data protection is done using DataGuard to copy log files and other DB related files between Production and DR (remote) sites. Since this whole process is automated using San ...
3. Relational Model and Relational Algebra
... • A query language (QL) is a language that allows users to manipulate and retrieve data from a database. • The relational model supports simple, powerful QLs (having strong formal foundation based on logics, allow for much optimization) • Query Language != Programming Language – QLs are not expected ...
... • A query language (QL) is a language that allows users to manipulate and retrieve data from a database. • The relational model supports simple, powerful QLs (having strong formal foundation based on logics, allow for much optimization) • Query Language != Programming Language – QLs are not expected ...
Messages
... 3054 Too many Memo or Long Binary fields. 3055 Not a valid file name. 3056 Couldn't repair this database. 3057 Operation not supported on attached tables. 3058 Can't have Null value in index. 3059 Operation canceled by user. 3060 Wrong data type for parameter 'Item'. 3061 Item1 parameters were expec ...
... 3054 Too many Memo or Long Binary fields. 3055 Not a valid file name. 3056 Couldn't repair this database. 3057 Operation not supported on attached tables. 3058 Can't have Null value in index. 3059 Operation canceled by user. 3060 Wrong data type for parameter 'Item'. 3061 Item1 parameters were expec ...
r – s
... Example: {customer-name} is a candidate key for Customer, since it is a superkey (assuming no two customers can possibly have the same name), and no subset of it is a superkey. ...
... Example: {customer-name} is a candidate key for Customer, since it is a superkey (assuming no two customers can possibly have the same name), and no subset of it is a superkey. ...
Working with tempdb in SQL Server 2005
... reset to the configured value (the default is 8 MB). Auto grow is temporary for tempdb (unlike other types of databases). It is reset when SQL Server restarts. Users can explicitly create and use tables in tempdb. Transactions can be used to modify data in the tables. Transactions can be rolled back ...
... reset to the configured value (the default is 8 MB). Auto grow is temporary for tempdb (unlike other types of databases). It is reset when SQL Server restarts. Users can explicitly create and use tables in tempdb. Transactions can be used to modify data in the tables. Transactions can be rolled back ...
dmxcourse
... Script-driven comms for Async & TCP/IP Normally used with standard scripts Can be used for most Internet protocols Can be used to create a server For secure comms use with Stunnel ...
... Script-driven comms for Async & TCP/IP Normally used with standard scripts Can be used for most Internet protocols Can be used to create a server For secure comms use with Stunnel ...
Implementing SPARQL Support for Relational Databases and Possible Enhancements
... In order to make the Semantic Web real we need the infrastructure to store, query and update information adhering to the RDF paradigm. Such infrastructure can be developed from scratch or benefit from developments and experiences made in other science & technology realms such as within the database ...
... In order to make the Semantic Web real we need the infrastructure to store, query and update information adhering to the RDF paradigm. Such infrastructure can be developed from scratch or benefit from developments and experiences made in other science & technology realms such as within the database ...
Corporate Profile 2014
... •The ...To... annotations define a single/multiple-valued association to another entity that has ...-to-... multiplicity. It is not normally necessary to specify the associated target entity explicitly since it can usually be inferred from the type of the object being referenced. •If the relationshi ...
... •The ...To... annotations define a single/multiple-valued association to another entity that has ...-to-... multiplicity. It is not normally necessary to specify the associated target entity explicitly since it can usually be inferred from the type of the object being referenced. •If the relationshi ...
Accessing multidimensional Data Types in Oracle 9i Release 2
... ORACLE Deutschland GmbH, Notkestrasse 15, 22607 Hamburg [email protected] ...
... ORACLE Deutschland GmbH, Notkestrasse 15, 22607 Hamburg [email protected] ...
Spring 2002 Transaction Information Systems
... • Aborted, after the transaction has been rolled back and the database restored to its state prior to the start of the transaction. Two options after it has been aborted: – restart the transaction – only if no internal logical error – kill the transaction • Committed, after successful completion. ...
... • Aborted, after the transaction has been rolled back and the database restored to its state prior to the start of the transaction. Two options after it has been aborted: – restart the transaction – only if no internal logical error – kill the transaction • Committed, after successful completion. ...
Scaling Up with SQL Server 2008
... includes many features and enhancements to optimize performance across all of its areas of functionality, including relational Online Transaction Processing (OLTP) databases; Online Analytical Processing (OLAP) databases; reporting; and data extract, transform, and load (ETL) processes. ...
... includes many features and enhancements to optimize performance across all of its areas of functionality, including relational Online Transaction Processing (OLTP) databases; Online Analytical Processing (OLAP) databases; reporting; and data extract, transform, and load (ETL) processes. ...
Run-Time Optimizations of Join Queries for Distributed Databases
... in the query execution. They use a similar technique to our probing mechanism to capture the workload however, the communication cost is calculated as a linear function of the size of the tuples transmitted. We show that the communication cost is not a linear function of the size (see Fig. 8). That ...
... in the query execution. They use a similar technique to our probing mechanism to capture the workload however, the communication cost is calculated as a linear function of the size of the tuples transmitted. We show that the communication cost is not a linear function of the size (see Fig. 8). That ...
Description - Datu bāzes tehnoloģijas
... engine selects all of the records that meet the conditions in the SQL statement. Omits records that contain duplicate data in the selected fields. To be included in DISTINCT the results of the query, the values for each field listed in the SELECT statement must be unique If the SELECT clause contain ...
... engine selects all of the records that meet the conditions in the SQL statement. Omits records that contain duplicate data in the selected fields. To be included in DISTINCT the results of the query, the values for each field listed in the SELECT statement must be unique If the SELECT clause contain ...
Versant Object Database
Versant Object Database (VOD) is an object database software product developed by Versant Corporation.The Versant Object Database enables developers using object oriented languages to transactionally store their information by allowing the respective language to act as the Data Definition Language (DDL) for the database. In other words, the memory model is the database schema model.In general, persistence in VOD in implemented by declaring a list of classes, then providing a transaction demarcation application programming interface to use cases. Respective language integrations adhere to the constructs of that language, including syntactic and directive sugars.Additional APIs exist, beyond simple transaction demarcation, providing for the more advanced capabilities necessary to address practical issues found when dealing with performance optimization and scalability for systems with large amounts of data, many concurrent users, network latency, disk bottlenecks, etc.