Oracle Database 11g R2 Architecture And Internals Pdf Writer
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This chapter discusses the memory architecture of an Oracle instance.
In database computing , Oracle Real Application Clusters RAC — an option  for the Oracle Database software produced by Oracle Corporation and introduced in with Oracle9i — provides software for clustering and high availability in Oracle database environments.
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PGA is the memory reserved for each user process connecting to an Oracle Database and is allocated when a process is created and deallocated when a process is terminated. I came across several DBAs enquiring about how the PGA Memory is allocated and from their I cam to know about several misconceptions people are having so writing a short note on the same. Hence its not that all of the memory allocated to PGA is granted at the time DB is started and gradually increases with number of user processes. SGA is used to store database information that is shared by database processes. It contains data and control information for the Oracle Server and is allocated in the virtual memory if the computer where Oracle resides. Like Liked by 1 person. Like Like.
A major portion of your understanding of Oracle, both to be a successful Oracle DBA and to be a successful taker of the OCP Exam 2 for Oracle database administration, is understanding the Oracle database architecture. About 22 percent of OCP exam 2 is on material in these areas. Oracle in action consists of many different items, from memory structures, to special processes that make things run faster, to recovery mechanisms that allow the DBA to restore systems after seemingly unrecoverable problems. You should review this chapter carefully, as the concepts presented here will serve as the foundation for material covered in the rest of the book, certification series, and your day-to-day responsibilities as an Oracle DBA. The Oracle database server consists of many different components.
Oracle Database 11g: Administration Workshop I
There are a lot of opportunities from many reputed companies in the world. According to research, Oracle DBA has a market share of about 0. This course will help you to achieve excellence in this domain. Oracle automatically maintains and uses indexes and when any change is made in the table data Oracle automatically distributes it into relevant indexes. Oracle usually publishes a major release once a 4 year.
SDL developed the original version of the Oracle software. The name Oracle comes from the code-name of a CIA-funded project Ellison had worked on while previously employed by Ampex. Oracle documentation can refer to an active database instance as a "shared memory realm". In addition to storage, the database consists of online redo logs or logs , which hold transactional history. Processes can in turn archive the online redo logs into archive logs offline redo logs , which provide the basis if necessary for data recovery and for the physical-standby forms of data replication using Oracle Data Guard. If the Oracle database administrator has implemented Oracle RAC Real Application Clusters , then multiple instances, usually on different servers , attach to a central storage array.
This chapter discusses the memory architecture of an Oracle Database instance. When an instance is started, Oracle Database allocates a memory area and starts background processes. The memory area stores information such as the following:. Information about each connected session , even if it is not currently active. Information needed during program execution, for example, the current state of a query from which rows are being fetched.
PDF · Mobi · ePub. 14 Memory Architecture. This chapter discusses the memory architecture of an Oracle Database instance. The SGA is a read/write memory area that, along with the Oracle background processes, make up a database instance. The database uses internal algorithms to manage buffers in the cache.
Oracle DBA Interview Questions
Стратмор закрыл дверцу холодильника и без тени волнения взглянул на Чатрукьяна. - Ты имеешь в виду работающий монитор. Чатрукьян растерялся.
Все прочитали: - Разница в весе незначительна… разделяются вследствие газовой диффузии… 10,032498X10134 в сравнении с 1939484X1023. - Ну вот, наконец-то! - вскрикнул Джабба. - Это и есть их вес. - Тридцать секунд.
- Помни это…. Ему казалось, что с него сорваны все внешние покровы. Не было ни страха, ни ощущения своей значимости - исчезло .
Моя интуиция подсказывает мне… - Что ж, ваша интуиция на сей раз вас обманула, мисс Милкен. В первый раз в жизни. Мидж стояла на своем: - Но, сэр. Коммандер Стратмор обошел систему Сквозь строй.