Oracle DBA Online training in India
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Rs - web trackker is the best Oracle DBA online training in India, Delhi,
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our specialized training programs now. Database Administrators DBA’s are responsible for the design,
implementation, support and maintenance of computerized databases in today's
organizations. The role also includes architecting, building and scaling
databases for future data growth and capacity. They are also responsible for
security, performance and availability of data to users and customers.
Oracle dba online training in india : All the above tasks are performed with the
help of a Database Management System (DBMS) and the leading and most widely
used DBMS across the world today are the Oracle Database, Microsoft SQL Server,
MySQL database etc. Out of the three DBMS technologies, Oracle Database is the
most popular and widely used database in the world today. Database or
simply DB is an organized and structured collection of information which
can be to efficiently retrieved, updated and analyzed. A simple VB code,
C, excel or notepad cannot manage large number of users and files. Also easy
extraction, backup and restoration of data is not possible with this approach.
To counter this limitation Oracle has come up with Oracle database or Oracle
RDBMS.
It is the relational database management
system. The main objective of this is to store, manage and retrieve information
efficiently to deliver high performance. It is also termed as RDBMS or simply
Oracle. Oracle consists of
various software mechanisms to achieve maximized data concurrency, high
performance for maximum productivity for multi users in database environment.
Some of the key features
of Oracle DBA are:
·
Database administration is not a task of single person, but
handled by a group of specialists
·
The first ever database suitable for enterprise grid computing
·
works on grid-based architecture.
In Oracle, there are
three basic categories of physical files used to store information. These are –
File Type
|
Description
|
Data
files
|
Contains
the data required to start the database engine
|
Control
files
|
Storehouse
of metadata of the database used by the Oracle engine
|
Redo
log files
|
Used
to store the changes made to the database
|
Parameter
files
|
Remains
in the machine on which Oracle database server executes
|
To Learn
Oracle DBA, it is required to understand the basic terminologies used
in it.
- Instance
– It is defined as the
background processes and memory structure used to retrieve data from a
database.
- Process- Also termed as task or job, is a
running instance. There are two types of processes in Oracle database
system namely, Oracle processes and User processes. There is no need to use
any operating system command to interact with the database.
- Buffer
Cache – It is SGA
component which acts like a buffer to store the data being customized or
queried. It stores the most recently or frequently used data in memory
which improves the performance. All the user processes that are connected
to the database share an access to it.
- Shared
pool- It captures
information 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 that are made in the database. The redo log files run in
circular motion and get overwritten. So, to maintain the recoverability of
the database for longer duration, they are archived into archive logs.
Therefore, redo log helps to 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 offer memory allocations for large processes, like
recovery operations and Oracle backup.
- Locks- For controlling the simultaneous
access to data resources, locks are used.
The database consists of logical and physical
structures. Because these structures are separate, the management of physical
storage of data does not affect the access to logical structures.
Above mentioned information is required to get the basic
understanding of the database. We have tried to cover all important parameters
and terms used in Oracle.
Our other Courses :
Company Address:
Webtrackker Technology
C- 67, Sector- 63 (Noida)
Phone: 0120-433-0760, 8802820025
Email: info@webtrackker.com
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