3i Infotech Placement: Sample Questions 37 - 38 of 1245

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Question 37


Write in Short

Short Answer▾

What are proxy objects?


  • Objects that points to other objects are called proxy objects or surrogates.
  • Proxy object provide the same interface as the server object but provide no functionality.
  • A method invocation to proxy object routes data to the true server object and sends back the return value to the object.
  • Proxy objects have significantly reduced capabilities compared to their corresponding custom objects. For example, operations such as erasing and moving an object, or changing object properties, may or may not be possible on a proxy object, depending on the application that created it.

Question 38




All data files related to a Table space are removed when the Table space is dropped




Structure of Two Tablespace
  • A table space is a logical group of data files in a database.
  • Indicate the database storage location, not the logical database structure or schema
  • Using table space admin can control the disk layout of an installation.
  • DB contains at least one table space and usually two or more.
  • Database program automatically create a table space- SYSTEM.
  • A table space is made one or more data files.

Basically 4 Types of Table Spaces

  • Permanent:
    • Uses data files and normally contains the system and user data.
  • Temporary:
    • Temporary files are created temporary table space.
  • Undo:
    • It is permanent types of table space that are used to store undo data.
  • Read only:
    • It is a permanent table space it can only read, no write can take place, but table space can made read or write.
4 Types of Table Spaces

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