PCTFREE
From Oracle FAQ
PCTFREE is a block storage parameter used to specify how much space should be left in a database block for future updates. For example, for PCTFREE=10, Oracle will keep on adding new rows to a block until it is 90% full. This leaves 10% for future updates (row expansion).
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Monitor
SQL> SELECT pct_free FROM user_tables WHERE table_name = 'EMP';
PCT_FREE
----------
10
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Also see
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