Skip to main content

The Oracle Server

The Oracle Server consists of an Oracle instance and an Oracle database.

Oracle instance: Is a means to access an Oracle database. Its Always opens one and only one database. An Oracle instance is the combination of the background processes and memory structures. The instance must be started to access the data in the database. Every time an instance is started, a system global area (SGA) is allocated and Oracle background processes are started.The SGA is a memory area used to store database information that is shared by database processes.

Oracle database: An Oracle database is a collection of data that is treated as a unit. The general purpose of a database is to store and retrieve related information. The database has a logical structure and a physical structure. The physical structure of the database is the set of operating system files in the database.

Comments

Post a Comment

Popular posts from this blog

Oracle Developer Technical Interview Questions

Here i am putting all the questions i had faced during my interviews ... Interview at “3i InfoTech”, Chennai:  1) What is flow of execution of WHEN-NEW-FORM-INSTANCE, WHEN-NEW-BLOCK-INSTANCE, and WHEN-NEW-ITEM-INSTANCE? 2) What is PRE-QUERY and POST-QUERY? When these triggers will fire? 3) If the object library with some blocks and triggers if a form inherited that object library if u doesn’t need some trigger to be inherited the can u delete that trigger from that form? 4) How u can call a report from a form? Which property u has set in runtime? 5) If u create a relation between two blocks in the form what are all triggers it will create? 6) What is a ref cursor? 7) To call a form which type of built-ins u has to use? 8) What is the main difference between expand and variable property for a text item in reports. 9) In a report layout there is accepted and rejected fields and it has a parameter when u run the report based on the parameter the output should sh...
Post a Comment
Read more

Difference Between CASE and DECODE?

– CASE is a expression – DECODE is a function - CASE expression is ANSI SQL Statement - DECODE is specific to Oracle Syntax - CASE syntax contains WHEN and THEN  - DECODE will not have this - CASE allow expressions or Scalar Sub query Expressions inside the CASE statement - DECODE won't allow expressions inside the DECODE function
1 comment
Read more

Oracle Reports - Changing the current mode (Confine or Flex)

To set or override Confine mode:  In the Paper Layout view, click  Confine On or Confine Off  in the toolbar to toggle the mode: On: child objects cannot be moved outside their enclosing parent objects. Off: child objects can be moved outside their enclosing parent objects. To set or override Flex mode:  In the Paper Layout view, click  Flex On or  Flex Off in the toolbar to toggle the mode: On: parent borders "stretch" when child objects are moved against them. The child object maintains the same distance from the side it moves against. Off: parent borders remain fixed when child objects are moved against them.
Post a Comment
Read more