how to calculate free extents
How to calculate free extents in our production database for one particular segment? thanks in advance
are you looking for unused space below hwm?
... get total allocation for target segment - sum(bytes) from dba_extents
... calculate optimal allocation for target segment - assuming object was recently analyzed... num_rows * avg_row_len from dba_tables
... compare both - usually this does the trick with no further analysis.
... for fine grain results factor in pct_free/pct_free
Pablo (Paul) Berzukov
Author of Understanding Database Administration
available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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