Question { 8056 }

What is PGA?

Answer

Program Global Area (PGA) is a memory buffer that contains
data and control information for a server process

Question { 11481 }

What is Database Buffers ?

Answer

Database buffers store the most recently used blocks of
database data. It can also contain modified data that has
not yet been permanently written to disk.

Question { BirlaSoft, 8367 }

What is referential integrity ?

Answer

A rule defined on a column (or set of columns) in one table
that allows the insert or update of a row only if the value
for the column or set of columns (the dependent value)
matches a value in a column of a related table (the
referenced value). It also specifies the type of data
manipulation allowed on referenced data and the action to
be performed on dependent data as a result of any action on
referenced data.