Managing Databases with Oracle
An Oracle System Change Number (SCN):

is a value that keeps track of explicit locks.
is a value that is incremented whenever a dirty read occurs.
is incremented whenever a deadlock occurs.
is a value that is incremented whenever database changes are made.

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Managing Databases with Oracle
Which statement about sequences is not true?

NextVal and CurrVal are both sequence methods.
A sequence is an object that generates a sequential series of unique numbers.
Sequences are most often used to provide values for surrogate keys.
Sequences guarantee valid surrogate key values.

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Managing Databases with Oracle
In creating a procedure, you may get a message if you have compile errors. Which of the following is true?

The line numbers reported match the line numbers you see in your text editor.
SQL*Plus will automatically show the errors to you.
To see the errors, enter SHOW ERRORS in SQL*Plus.
If there are no syntax errors, you will receive the message "NO ERRORS."

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