1--Illustrate the architecture of Oracle Database 11g showing the relationship between the instance and the database. Also explain what happens when the database is running.

2-- If you were to create a database manually, using the fewest commands possible, identify these commands. Please explain.

3--You just created an Initialization Parameter File (init.ora) for a new database. The database has not been created yet. After filling in the necessary parameters you connect to the database as 'sys as sysdba'. You start the instance using the command, 'startup.' However you get a message that says, "Error in identifying control file." What could be the reason for that? Explain giving all possible reasons.

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One database can have one or more instances. From this point of view it can be stated that between an Oracle Database and its instances exists a 1:m (one-to-many) relationships.
According the explanatory draw from Oracle’s website, the database contains the data files, control file and online redo logs....

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