Is it necessary to prepare objects if use dbms_apply_admin to instantiation

Metalink says instantiation of database objects for Oracle Streams involves the steps as:
1. Prepare the objects for instantiation at the source site.
2. Create a copy of the objects at the destination site (ifnecessary).
3. Set the instantiation SCN for the objects at the destination site.
My question is: if we didn't use exp/imp as we already has the objects in the destination database, do we still need the step one? Can't we execute the dbms_apply_admin directly?

Hi,
Yes you can issue the apply directly. If the tables are the same (I like to insert-select) then you need to run the following steps:
1. Set up the q at the source (DBMS_STREAMS_ADM.SET_UP_QUEUE)
2. Set up the q at the target
3. Add the prop rules (DBMS_STREAMS_ADM.ADD_TABLE_PROPAGATION_RULES)
4. Add the capture rules at the source
5. Set the scn (from source) at the target (DBMS_APPLY_ADM.SET_SCHEMA_INSTANTIATION_SCN)
6. add the apply rules
7. start apply
8. start capture
You can skip the ones you have already done but I would stop what you have and start when everything is in place.
Mike

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I've written this code, based on some code from the SCJP book, but it is not exactly the same, this code talks about a different issue not addressed in the book.
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It is correct that b is referring to the same object that the map's key is pointing to, but why does the following
print null , instead of "somevalue"?
at these lines in the code above.
b.name = "sparrow";
System.out.println(hashMap.get(b));Because the hashCode used when you stored b was 4, and now it's 7. You should read the Wikipedia article on Hashtable, but a simplistic explanation is that a HashMap has a bunch of "buckets," say 10, each indexed with a number 0-9. To decide which bucket to put a new key-value pair in, you take the hashcode (say 2112) and take the remainder of hashcode/number of buckets (in this case, 2112%10=2). So when you store the key-value, it gets "put" in this bucket.
When you change the hashcode of b by changing its name attribute, it doesn't change the fact that the pair is in that bucket. But, it now looks in the wrong bucket and so can't find the pair.
A hashtable gets its good efficiency by not having to look through all values to find the pair. It can jump directly to the correct bucket, which takes constant time instead of being dependent on the number of items in the collection.
endasil wrote:
You should never, ever change an object being used as a key in a map.I guess this is a best practice, I just wanted to try changing the key object to test a few things for SCJP, which does not test on coding best practices but tests on how the code behaves.Yep, and what you should take away is that this is WHY it's bad to change the key :).

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Hi Experts!
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Is it necessary to prepare objects if use dbms_apply_admin to instantiation

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