Managing Databases with Oracle
SQL*Plus will finish the statement and execute it when the user types in this:

A colon ( : ) followed by [Enter].
A semicolon ( ; ) followed by [Enter].
A left slash ( ) followed by [Enter].
A period ( . ) followed by [Enter].

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

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.
is a value that keeps track of explicit locks.

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