What is Oracle DBA?
In this Oracle DBA tutorial, we will learn what exactly Oracle DBA is, its architecture, features, and much more. But for all this, first, we need to know what a database is.
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So, what is a database?
A database (DB) is an organized and structured collection of information that can be efficiently retrieved, updated, and analyzed. A simple VB code, C, Excel, or Notepad might not be able to manage a large number of users and files. Also easy extraction, backup, and restoration of data are not possible with this approach.
To overcome this limitation, Oracle has come up with Oracle Database; it is also called Oracle RDBMS or simply Oracle.
Yes, Oracle DBA is a relational database management system. The main objective of this is to store, manage, and retrieve information efficiently to deliver high performance.
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Oracle consists of various software mechanisms to achieve maximized data concurrency, high performance, and maximum productivity for a multi-user database environment.
Some of the key features of Oracle DBA are as follows:
- Database administration is not the task of a single person but handled by a group of specialists.
- It is the first-ever database suitable for enterprise grid computing.
- It works on grid-based architecture.
In Oracle DBA, below are the basic categories of physical files used to store information:
|Data file||Contains the data required to start the database engine|
|Control file||A storehouse for the metadata of the database used by the Oracle engine|
|Redo log file||Used to store the changes made to the database|
|Parameter file||Remains in the machine on which Oracle Database server executes|
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Oracle DBA Terminology
To learn Oracle DBA, it is required to understand the basic terminology used in it. In this Oracle DBA tutorial, next, we have collated the basic terms used in Oracle RDBMS:
- Instance: It is defined as the background process and memory structure used to retrieve data from a database.
- Process: A process, also termed as a task or a job, is a running instance. There are two types of processes in Oracle Database, namely, Oracle processes and User processes. There is no need to use an operating system command to interact with the database.
- Buffer cache: It is an SGA component that acts as a buffer to store the data being customized or queried. It stores the most recently or frequently used data in memory to improve performance. All the user processes that are connected to the database share access to it.
- Shared pool: It captures the information that needs to be shared with users. For example, stored procedures, SQL statements, etc. can be cached for reusability and fast access.
- Redo log buffer: It maintains a log of changes made in the database. Redo log files run in a circular motion and get overwritten. So, to maintain the recoverability of the database for a longer duration, they are archived into archive logs. Therefore, the redo log helps recover an instance when there is a system failure. This improves the performance and functioning of the database system.
- Large pool: It is the optional area that offers memory allocations for large processes, such as recovery operations and Oracle backup.
- Locks: For controlling simultaneous access to data resources, locks are used.
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Oracle Database consists of logical and physical structures. Because these structures are separate, the management of the physical storage of data does not affect the access to logical structures.
The above-mentioned information is required to get a basic understanding of a database. We have tried to cover all the important parameters and terms used in Oracle. Stay with us to learn more from this Oracle DBA tutorial!
Table of Contents
1.1 Operating Systems: It is important to note that a 64-bit Linux version of Oracle will not be installed on a 32-bit Linux or 64-bit Windows systems. Oracle Release Notes provide information about where to find the compatibility matrix and the system requirements for the server. The disk space requirements depend on the components installed. However, the base product alone Read More
Database Backup, Restore, and Recovery
Backing up Databases in Oracle: In layman's words, a data backup is a copy of the data that we keep so as to restore our original data in the case of events such as data loss. Needless to say, if we are running a business or even if we have some data on our computer that we wouldn't want to Read More
: 3.1 Maintenance Tasks 3.2 Consistency Checks Consistency checks validate database blocks and look for corruption in datafiles. Consistency checks look at the physical integrity of the data blocks and rows of objects. They can also validate the structures of objects and whether the tables and indexes still have corresponding values. Oracle checks for block corruption as database writers handle the Read More
Performance and Tuning
: Monitoring for performance issues and doing regular maintenance of databases will keep them tuned and performing better. 4.1 Better-performing Systems Planning the initial database design, monitoring the performance, and maintaining it are the proactive steps to achieving better-performing systems. This applies to any database environment. Along with proactive monitoring and tuning for performance, DBAs need to deal with performance issues Read More
Oracle RAC Tutorial
: 5.1 Options for High Availability Oracle has a Maximum Availability Architecture (MAA) that includes a combination of options with Data Guard and RAC environments. With RAC, we can apply rolling patches to eliminate the downtime while patching. Additional nodes can be added to the cluster to provide more resources since the nodes can use the CPUs and memory that are Read More