For Update Cascade

Hi,
I am migrating from SQL2k to oracle9i.What is the best alternative fr this constraint."For Update Cascade"

Not recommended, but look here for an answer.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:5773459616034

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Lock Cascade With Select for UPDATE

If I had a employee table and a phone table with a parent/child relationship and a primary key constraint on the employee table-will issuing a select for update on the employee also lock the corresponding child rows on the phone table ?
If not how can I bring this about ?

You only need two sessions:
First session: Issue the 'select for update'
statements for the row(s) in both tables, don't
rollback or commit
Second session: try to update a row that you tried to
lock in the first session (with NOWAIT).
Thanks. I can try this definitely. A basic question.
You are asking me to do a join on both the tables right ?
Not two individual SQL statements ?
Updating the primary key is known as a Bad Idea (tm).
The key should never be touched because it should be
meaningless. When you have a column that holds 'real'
information it is no candidate for a primary key.
Rgds,
GuidoYes I am aware of that. I was just wondering what is the meaning behind this statement from this link ?
http://www.akadia.com/services/ora_locks_survival_guide.html
And the exact phrase from that link under the section Referential Integrity Locks (RI Locks)
"RI constraints are validated by the database via a simple SELECT from the dependent (parent) table in question-very simple, very straightforward. If a row is deleted or a primary key is modified within the parent table, all associated child tables need to be scanned to make sure no orphaned records will result. "
Thanks again.

For update with order by

Hello all,
Does anyone know if "order by" has precedence over "for update"? In other words, using the following query. Will the resulting rows be sorted first and then locked or they will be locked first and then sorted?
SELECT /*+ cardinality(al 1) use_nl(al t) */ NULL
BULK COLLECT INTO l_nullvalue_list
FROM TABLE (i_list) al, my_table t
WHERE al.id = t.id
ORDER BY t.id
FOR UPDATE OF t.id;
Any help is very much appreciated.
Regards,
wf

This is the case I'm talking about:
drop table t cascade constraints purge;
create table t as select rownum id, cast('x' as char(100)) pad
                    from dual connect by level <= 10000;
drop table t1 cascade constraints purge;
create table t1(id int);
-- 1st session
SQL> lock table t1 in exclusive mode;
Table(s) locked
-- 2nd session
declare
    type t1_type is table of rowid index by binary_integer;
    l_tab t1_type;
begin
    execute immediate 'lock table t1 in share mode';
    select rowid bulk collect into l_tab
      from t order by dbms_random.value
       for update;
end;
-- 3rd session
declare
    type t1_type is table of rowid index by binary_integer;
    l_tab t1_type;
begin
    execute immediate 'lock table t1 in share mode';
    select rowid bulk collect into l_tab
      from t order by dbms_random.value
       for update;
end;
/Now 2nd & 3rd sessions are blocked by 1st. Let's release that lock:
-- 1st session
SQL> commit;
Commit complete2nd & 3rd sessions are trying to lock rows of table T, and one of sessions fails with deadlock:
declare
    type t1_type is table of rowid index by binary_integer;
    l_tab t1_type;
begin
    execute immediate 'lock table t1 in share mode';
    select rowid bulk collect into l_tab
      from t order by dbms_random.value
       for update;
end;
ORA-00060: deadlock detected while waiting for resource
ORA-06512: at line 7If you repeat the same scenario with ORDER BY id, then one session will be waiting for enqueue.
So, it's all about order in which row locks are acquired.

Heeeeelp - on update cascade

hi all
I posted the same question inn this forum but did not get any answer i'll try again in this post
my problem is that i created my tables in the database without on delete cascade on the foreign constraint and now 'm trying to modify that
I dropped the old foreign constraint and created new one with "on delete cascade" this worked fine for one table but when i came to the other tables it gave me this error:
ORA-02443:cannot drop constraint - constraint unavailable
but I'm sure the constraint with the name i used is available !!!
what are your suggestions???
another problem:
how to implement on update cascade in Oracle?
I found a solution in http://asktom.oracle.com/tkyte/update_cascade/index.html#download
but I don't know how to use , if someone knows please help
Thanks in advance

1 .
select constraint_type,constraint_name from user_constraints where table_name='<TABLE_NAME>' and
see if the constraint name that you are trying to delete exists.

It's possible ON UPDATE CASCADE in table relationships?

Hi, how are you?
Sorry my weak English, I'm brazilian.
I like create an "ON UPDATE CASCADE" in my table relationship but find only "ON DELETE CASCADE" in Oracle 9i Database Online Documentation.
I would like your help.
Thank you.
Eduardo A. Reche Lopes
Team T.I.
www.coodetec.com.br

Tom Kyte wrote a package for this:
UPDATE CASCADE PACKAGE
Generates needed package and triggers to support update cascade in Oracle without removing or infringing on DECLARITIVE RI.
This package supports:
- Tables with multi-part primary keys (primary key(a,c,b))
- Update cascade to many child tables from one parent
- Self-referencing integrity such as that found in the SCOTT.EMP table (mgr->empno)
- Is completely application transparent. The application does not know it is happening
- Versions 7.0 and above of the database.
- Tuned and optimized to fully avoid full table scans on all tables (complete with utility to show you un-indexed foreign keys in a schema, Cascading an update to un-indexed foreign keys can be bad).

ON UPDATE CASCADE and Autoincrement primary key with Oracle SQL Developer

hello everybody,
I want to know if Oracle SQL Developer manage autoincrement on primary key and "ON UPDATE CASCADE" when i migrate (with data) SQL Server database in Oracle database.
Can you help me ?
Thanks for your suggestions.

Obtain the value of the auto increment key with the getGeneratedKeys() method.
Statement stmt = null;
ResultSet rs = null;
stmt = conn.createStatement(java.sql.ResultSet.TYPE_FORWARD_ONLY,
                                java.sql.ResultSet.CONCUR_UPDATABLE);
stmt.executeUpdate("DROP TABLE IF EXISTS autoIncTable");
    stmt.executeUpdate(
            "CREATE TABLE autoIncTable ("
            + "priKey INT NOT NULL AUTO_INCREMENT, "
            + "dataField VARCHAR(64), PRIMARY KEY (priKey))");
stmt.executeUpdate(
            "INSERT INTO autoIncTable (dataField) "
            + "values ('data field value')",
            Statement.RETURN_GENERATED_KEYS);
int autoIncKeyFromApi = -1;
    rs = stmt.getGeneratedKeys();
    if (rs.next()) {
        autoIncKeyFromApi = rs.getInt(1);
    } else {
    rs.close();

Error message: "playlists selected for updating no longer exist"

I tried to update my ipod nano and I guess I had deleted a playlist, but since then, I have not been able to update. Every time I try, I get the following message:
"Cannot be updated because all of the playlists selected for updating no longer exist."
I haven't been able to highlight which playlists are selected to begin with.
I read through the manual and thought that maybe rebooting the whole system might work. So I deleted Itunes from my computer and re-installed.
Then I tried re-setting my ipod. So now I have nothing on my ipod.
I also deleted everything from my library, thinking it might help to start from scratch. Nothing has worked.
How do I "select" and "unselect" playlists so I can get up and running again?

Here you go.
http://discussions.apple.com/thread.jspa?messageID=607312&#607312

Why does my app store use a different account for downloading and another for updating apps?

My app store used my own account for downloading and my sister's for updating, and it keeps telling me to reset my account. I already did that the other few times it told me to do that!

Have you restored your device from your sister's backup?

Lost music on ipod because "playlists selected for updating no longer exist

Not sure what I've done. I recently downloaded newer version of itunes. Then when synching, I had too much music in my library for the ipod to handle so it told me about doing the smart playlist. I erased a couple of playlists on the itunes menu I no longer wanted and then when I went to synch, this error came up "songs on the ipod cannot be updated because all of the playlists selected for updating no longer exist."
Please help.....

Check this out.
iPod cannot sync because one or more playlist....

Playlists for updating no longer exist

i am a novice...i deleted my ipod nano playlist from source list...i also updated yesterday...no i keep getting a screen when i connect my ipod to computer that reads, "songs on the ipod cannot be updated because all of the playlists for updating no longer exist. but all songs remain in library....Help!

You will find this user tip useful for resolving the missing playlist issue: Hudgie - iPod cannot sync because one or more playlists are missing

"songs..can't be updated b/c all the playlists for updating no longer exist

My Ipod was "off power" for so long that it "forgot" all its music. Now when I plug it in to my base computer, rather then synching it says "songs on the ipod "name" cannot be updated because all the playlists for updating no longer exist"

Hey.
See if this can help;
http://discussions.apple.com/thread.jspa?threadID=121728&tstart=150
Cheers!
-Bryan

"All of the Playlists Selected for Updating No Longer Exist"

My family has 2 ipod shuffles. After purchasing a Nano recently, I inserted the cd that came with it. Apparently the existing iTunes software was removed and reinstalled. At any rate, the library still shows all the original songs, but when the Nano is plugged in, iTunes immediately gives a prompt stating "Songs on the iPod *** cannot be updated because all of the playlists selected for updating no longer exist." The library is there, the playlists that were there are there, and I can play the songs on my cpu. Is there anything I can do besides completely uninstalling everything and starting over?
iPod Nano Windows XP Pro

This user tip should help you sort out your missing playlist problem: Hudgie - iPod cannot sync because one or more playlists are missing

"All of the playlists for updating no longer exist"???!!

I created a few new playlists and deleted an old one in iTunes, and then when I plugged in my mini to update I get the message:
Songs on the iPod Kellee's iPod cannot be updated because all of the playlists for updating no longer exist"
There are no songs in my mini after this msg. I reset it, tried to update again, but got the same msg. Please help!!

Hi Kellee!
Why do people delete playlists?? Seems like you have the same problem someone I tried to help has. She got the exact same error message when she deleted a playlist. If I were you I would have shifted some songs around, changed the name of the playlist to something else but NOT deleted the playlist. I don't think you can get the same playlist back once you delete it. Question is why is your iPod not recognizing your new playlists and it's requesting to update the playlist you already deleted?? I'm afraid I can't help you but maybe someone else can. I just wanted to say this.

"playlist for updating no longer exists!"

Recently my ipod reached its full capacity so I could not add anymore songs onto my ipod, instead it created a seperate playlist of songs which were most played etc. However I accidently deleted that playlist and now my ipod is blank and won't let me put songs on it
the message reads : "songs on the ipod cannot be updated because all of the playlists selected for updating no longer exist"
does anyone know how i could fix this problem?
any help would be much appreciated
thanks!

Open iTunes prefs-> iPod and set it to Automatically update selected playlists and select a new playlist.

"Playlists selected for updating no longer exist"?!

everytime i plug my ipod mini into the computer, a pop up appears saying that the playlists selected for updating no longer exist!!! it's done this before, so i completely restored the setting and made a whole new library. now it's doing it again. i have all the playlists and songs on my computer in a folder. all the songs that were on my ipod, got deleted when i plugged it into the computer. so my ipod is blank, but i have the songs in my library still. they just wont upload. any help would be greatly appreciated....

Check this out.
iPod cannot sync because one or more playlist....

For Update Cascade

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