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ORA-12842: Cursor invalidated during parallel execution
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Answer Posted / prepareinterview
1. What are the components of physical database structure of
Oracle database?
Oracle database is comprised of three types of files. One or
more datafiles, two are more redo log files, and one or more
control files.
2. What are the components of logical database structure of
Oracle database?
There are tablespaces and database's schema objects.
3. What is a tablespace?
A database is divided into Logical Storage Unit called
tablespaces. A tablespace is used to grouped related logical
structures together.
4. What is SYSTEM tablespace and when is it created?
Every Oracle database contains a tablespace named SYSTEM,
which is automatically created when the database is created.
The SYSTEM tablespace always contains the data dictionary
tables for the entire database.
5. Explain the relationship among database, tablespace and
data file.
Each databases logically divided into one or more
tablespaces one or more data files are explicitly created
for each tablespace.
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