Interrupted TRUNCATE TABLE command

Question

Hello,
I've made very dangerous mistake today: TRUNCATE TABLE on production database. :-(
But in several seconds (2 or 3), I managed to break the operation (Before the execution ended).
It was quite a big table, now (after the accident) there are more then 32 million records.
We need to know, are there any records deleted?
We have no proper backup, to compare the records with it.
And I could not find any in-depth description of how TRUNCATE works.
Please can you:
1. Tell, about any method to check if there are deleted records?
2. Link, to any resource, where I can read in details, about how TRUNCATE TABLE works.
Thanks, in advance, for help

Answer 1

My understanding is that the TRUNCATE TABLE table statement is atomic. It either fails or succeeds. Truncates all rows or no rows at all. Therefore if you interrupt a TRUNCATE TABLE statement your table should remain in its original state.
This can be shown below:
SQL > CREATE TABLE TEST AS SELECT * FROM ALL_OBJECTS;
Table created.
SQL > INSERT INTO TEST SELECT * FROM TEST;
12421 rows created.
SQL > INSERT INTO TEST SELECT * FROM TEST;
24842 rows created.
SQL > INSERT INTO TEST SELECT * FROM TEST;
49684 rows created.
SQL > INSERT INTO TEST SELECT * FROM TEST;
99368 rows created.
SQL > INSERT INTO TEST SELECT * FROM TEST;
198736 rows created.
SQL > INSERT INTO TEST SELECT * FROM TEST;
397472 rows created.
SQL > INSERT INTO TEST SELECT * FROM TEST;
794944 rows created.
SQL > INSERT INTO TEST SELECT * FROM TEST;
1589888 rows created.
SQL > SELECT COUNT(*) FROM TEST;
  COUNT(*)
   3179776
SQL > TRUNCATE TABLE TEST;
^C
H:\>sqlplus /@testdb
SQL*Plus: Release 10.2.0.4.0 - Production on Mon Aug 3 08:20:11 2009
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
Enter password:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL > SELECT COUNT(*) FROM TEST;
  COUNT(*)
   3179776HTH!