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ORACLE Interview Questions and Answers
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(Continued from previous part...)
116. What is SGA?
The System Global Area in an Oracle database is the area in memory to facilitate the transfer of information between users. It holds the most recently requested structural information between users. It holds the most recently requested structural information about the database. The structure is database buffers, dictionary cache, redo log buffer and shared pool area.
117. What is a shared pool?
The data dictionary cache is stored in an area in SGA called the shared pool. This will allow sharing of parsed SQL statements among concurrent users.
118. What is mean by Program Global Area (PGA)?
It is area in memory that is used by a single Oracle user process.
119. What is a data segment?
Data segment are the physical areas within a database block in which the data associated with tables and clusters are stored.
120. What are the factors causing the reparsing of SQL statements in SGA?
Due to insufficient shared pool size.
Monitor the ratio of the reloads takes place while executing SQL statements. If the ratio is greater than 1 then increase the SHARED_POOL_SIZE.
121. What are clusters?
Clusters are groups of one or more tables physically stores together to share common columns and are often used together.
122. What is cluster key?
The related columns of the tables in a cluster are called the cluster key.
123. Do a view contain data?
Views do not contain or store data.
124. What is user Account in Oracle database?
A user account is not a physical structure in database but it is having important relationship to the objects in the database and will be having certain privileges.
125. How will you enforce security using stored procedures?
Don't grant user access directly to tables within the application.
Instead grant the ability to access the procedures that access the tables.
When procedure executed it will execute the privilege of procedures owner. Users cannot access tables except via the procedure.
126. What are the dictionary tables used to monitor a database space?
DBA_FREE_SPACE
DBA_SEGMENTS
DBA_DATA_FILES.
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