By Rick Greenwald, Robert Stackowiak, Jonathan Stern
Книга Oracle necessities, Fourth version Oracle Database 11g Oracle necessities, Fourth version Oracle Database 11g Книги Oracle Автор: Rick Greenwald, Robert Stackowiak, Jonathan Stern Год издания: 2007 Формат: pdf Издат.:O Reilly Страниц: 408 Размер: three ISBN: 0-596-51454-9 Язык: Русский0 (голосов: zero) Оценка:-
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BI Publisher A publishing and report layout tool used in generating high-fidelity reports from XML data. Service Registry The Oracle Service Registry enables publishing and advertising of services and provides a System of Record for SOA services. SOA Suite for Oracle Middleware The Suite bundles Oracle Fusion Middleware SOA offerings, including BPEL, BAM, business rules engine, Enterprise Service Bus (for messaging, routing, and transformations), Web Services Management (including a policy manager and monitoring dashboard), Web Services Registry, and applications and technology adapters.
We’ve divided the discussion in the following subsections into two categories: database parallelization and data warehousing. Database Parallelization Database tasks implemented in parallel speed up querying, tuning, and maintenance of the database. By breaking up a single task into smaller tasks and assigning each subtask to an independent process, you can dramatically improve the performance of certain types of database operations. Examples of query features implemented in parallel include: • Table scans • Nested loops • Sort merge joins • GROUP BYs • NOT IN subqueries (anti-joins) • User-defined functions • Index scans • Select distinct UNION and UNION ALL • Hash joins • ORDER BY and aggregation • Bitmap star joins • Partition-wise joins • Stored procedures (PL/SQL, Java, external routines) In addition to parallel query, many other Oracle features and capabilities are parallelized.
Oracle Connection Manager Each connection to the database takes up valuable network resources, which can impact the overall performance of a database application. Oracle’s Connection Manager (CMAN), illustrated in Figure 1-3, reduces the number of Oracle Net client network connections to the database through the use of concentrators, which provide connection multiplexing to implement multiple connections over a single network connection. Connection multiplexing provides the greatest benefit when there are a large number of active users.