Sequence PK generation is messed up after table import

Thought I'd post this here where the possibility of direct object manipulation is what it needed.
Recently created new 10.2.0.1.0 database on new machine as a copy of one running on another machine. Installed Apex 2.2 and used the data import feature within to transport tables from the one machine to the new one. All tables were imported exactly as they were in the original DB. Primary Keys and column types are set exactly the same as the orig along with exact same AUTOID_PK column definition. New sequence was created and associated with correct PK column as in orig. Data import was all successful.
Then imported the associated Apex Application from orig DB, exported as 2.2 into new 2.2 Apex.
Problem occurs now when attempting to add new records, getting a PK violation apparently due to duplicate keys being created at insertion time from the PK's associated sequence.
I've done this same procedure in the past and not had this problem.
Using SQL Developer to look at the associated PK index I see that the index sees 205 distinct keys, 205 rows, and a sample size of 205.
++++ Does the problem stem from the next sequence value being generated is 206 ???? +++
I'm not a pro with the functionality of Oracle as you may be able to tell.
The duplicate AUTOID value may come from the fact that although there are only 205 records and 205 distinct different AUTOID values, the values themselves do not run from 1 to 205 since there have been many deletions and additions. The highest value in the AUTOID field is 376, and I would assume the sequence needs to start generating the next value from 377 forward so as not to cause this PK violation.
That is just a deduction rather than possible fact, can anyone help with identifying the problem if I'm wrong, and can I get some help correcting this so I can continue on from where I left off?
This is a problem in 2 tables at the moment, shouldn't be any more.
Thanks to anyone who can help.
Jacob

If I understood you correctly, sequences were precreated on target db before running import. If so, that is where problem was created. Oracle exports sequence definition not with original START WITH value but rather with START WITH last_number. This ensures imported sequence will not generate already generated values. You, most likely, precreated sequences with START WITH 1 and used imp with IGNORE=Y. As a result sequences started to generate duplicate values.
SY.

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Sequence error after table import

I swear I'll never cross post again, this is also in PL/SQL but after reading it it appears the responses I'll get there are geared more towards someone using sql plus.
Had an app, tables & sequences running fine in 2.2 on one machine. Set up another machine to mirror working version with Apex 2.2. Imported tables into new tables on target, created sequences during import that mirror original tables and sequences.
Sequence populates into AUTOID column as in orig. When attempting to insert a new record I get a primary key violation. If I hit the back button and resubmit the page it accepts the record. When I look into the pk index I see 205 unique keys and 205 records. This record count is correct but there have been deletions and additions to this table in the orig database and thus new AUTOID values were generated and the values in the target table are not linear from 1to205. They skip around and the highest is actually now 266.
Is this problem due to the sequence seeing 205 unique keys and generating the next one at 206, which already exists in the table?
If so, why can I back up to the form and successfully resubmit?
At any rate, anyone have an idea how to correct this or change the sequence starting number to something higher than anything in the table so I don't have to deal with this?
Thanx
Won't cross post again :)

I did notice though that when I start a table off with a column named AUTOID as a number Apex seems to pick that column as default when I create a sequence.
Probably because it's the 1st column in your table. The name being "AUTOID" doesn't mean anything to ApEx.
When I look at the structure of the sequence I still don't see where in the sequence it finds what number to pull next. I do see that it selects from dual, which I never understood the purpose of anyway, but I don't see how the next number is determined. Is that where the cache comes in? Does it save 20 numbers and just keep decrementing?
If you use the ApEx Object Browser, you can see the last value of the sequence.
In order to get the next value of the sequence, you have to SELECT it from something. DUAL is typically used because it always has 1 column & 1 row. Thus, you can guarantee that a statement such as this:
select my_sequence.nextval from dual
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The "20" which you are referring to is the number of values it will cache in memory. This is why you may see gaps of 20 in your sequences - depending on the load of the Database, the values may get flushed out of the cache.
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Sequence PK generation is messed up after table import

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