Chapter 8. Managing Database and Database Storage

A man is but the product of his thoughts what he thinks, he becomes. - Mahatma Gandhi

This chapter provides background information on memory management in Oracle Database 11g XE and managing physical files related to the database. Oracle memory is of two types, namely System Global Area (SGA) and Process Global Area (PGA). SGA is a memory that is shared by all Oracle processes, while PGA is a private memory allocated to individual processes. These topics will be covered in this chapter in more detail. We will also explore the physical database structure along with the logical database structure. The topics covered in this chapter are as follows:

• Memory structure

  • System Global Area

  • Process Global Area

• Automatic Memory Management

• Important background processes

• Physical and logical database structures

  • Creating a tablespace

  • Adding datafiles to a tablespace

  • Dropping a tablespace

  • Viewing tablespace usage

• Managing Flash Recovery Area

Memory structure

Oracle...