Why does it take longer to load identical data into 2 identical tables/

I have two identical Oracle tables.  Table A was created as a "create table as...where 1=0" from Table B.  Table B was truncated prior to inserting the data into it.

Each have the same fields, indexes and belong to the same tablespace.  Table B has about half of the empty blocks as Table A.

When a user runs process XYZ to load data into either table, the insert takes way longer for Table B than it does for Table A.  

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it sounds as if table B is fragmented, and is looking for space to put the data maybe?
cbetterAuthor Commented:
How can you tell if it's fragmented?  We're using ASM.
Franck PachotOracle DBACommented:

I see no obvious reasons. You can run:

    ALTER SESSION SET EVENTS '10046 trace name context forever, level 8';
    you insert query
    ALTER SESSION SET EVENTS '10046 trace name context off';

then tkprof the dump file and you will see where the time is spent.


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