Oracle Server Architecture and Metrics
Oracle Server Architecture and Metrics is a database design that consists of many instances running on different server machines. They all have access to the same database. On one end, the group of server machines appears as a single server, while on the other end, applications and end-users see it as a single server. The Oracle (DBMS) is made up of various components (which are analogous to UNIX’s multitasking operating system implementation): Oracle key software and scripts are installed in the $ORACLE HOME environment variable’s folder as well as the Windows Registry. Clients establish sessions with user applications by employing Protocols to navigate around interfaces.
There are two parts to “databases”: First, Instances (the system’s “brain”) allow users to access data that has been saved. Each instance is made up of the following elements: data files stored on fixed storage devices, RAM regions that are utilized by Service requests, and application software are handled in the background. Second, the Business Manager and The Configuring Assistant (DBCA) are two development and analysis tools that manage the DBMS in this Server Architecture (WilsonMar. (n.d.)). However, this architecture has its importance and benefits. First, we may improve query execution time and hence application operations by applying performance optimization in its database to retrieve and update data faster.
Second, it has a database that allows numerous database instances to be managed on a single server. The database resource manager and instance caging work together to manage services across multiple instances. Finally, the Real Application Clusters are used to produce a higher data availability system. Traditional database servers have advantages over RAC databases. Finally, RMAN (Recovery Manager) is an Oracle database feature that allows you to restore or recover files during outages and downtimes. All backup types are supported, including online backups, archived backups, and continuous archiving.
Topic 2: Oracle Components
What is the difference between database and instance? What are the components of a data file, a redo log file, and a control file?
Although the phrases database and instance are sometimes used interchangeably, they do not have a similar concept. In this case, a Database is a collection of files that stores application content (the main reason for having the database) and metadata. The software that Oracle employs to modify information in a database is referred to as an instance. The database must be opened before the instance can manipulate the data. A database can be viewed (or mounted) by several instances, but each instance can only open one database at a time.
The system software files which store the data in the database are known as data files. The information is entered into these folders in an Oracle-only format that other programs cannot read. Temp files are a unique type of data file that is exclusively used with temporary tablespaces (Loney, 2004). The redo log, which comprises two or even more pre-allocated records that are used to hold all alterations made to the system as they occur, is the most important structure for recovery operations. Each instance of a DBMS has an attached redo log to safeguard the database in event of an instance breakdown. An Oracle database contains a control file, which is a tiny binary file (Loney, 2004). The control file has components such as database name, database creation timestamp, data file names and locations, redo log file names and locations, and so on. Checkpoint information and the present log sequence number.
References
WilsonMar. (n.d.). Oracle Server Architecture and Metrics. Retrieved from http://www.wilsonmar.com/1oraarch.htm.
Loney, K. (2004). Oracle database 10g: the complete reference. London: McGraw-Hill/Osborne.
The difference between database and instance. Retrieved from: http://www.adp-gmbh.ch/ora/misc/database_vs_instance.html.
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