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Too many extents....

From: Darrell Landrum <>
Date: Sat, 28 Jun 2003 11:49:36 -0700
Message-ID: <>

Scads of extents in a dictionary managed tablespace...BAD!

In a dictionary managed tablespace with default storage of 104K/104K (I didn't know this until way later / too late), I created a table (without specifying storage) and loaded that thing up. It was taking up 7.5 GB on disk when complete. Then later, when his new home was ready, I used 'alter table move' to put him there, followed by altering the source tablespace offline and dropping it. On an HP N-class machine with 8 processors and 16 GB RAM and a very healthy EMC symm for storage, it took almost 4 hours for Oracle to deallocate those 65,000 + extents, coalesce and release the tablespace.

The same operation (move table, drop tablespace, etc.) took less than 30 minutes when going from/to LMTs with uniform of 50M. Maybe later I'll try the original mess up with tiny extents / big table in an LMT just for fun!


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Author: Darrell Landrum

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