Alter a column with sequence numbers

Hi to all,
i have a table (sample) with cplumns: sno, sname,dob and so on..........
In this table i have milions of rows with random numbers in column sno
i want to give the give the sequence numbers from 1 to 10000 in the sno column to the begining rows in the table
(Oracle)
could u post the code plese
thanks & Regards
Tangella

Tangella wrote:
Hi to all,
i have a table (sample) with cplumns: sno, sname,dob and so on..........
In this table i have milions of rows with random numbers in column sno
i want to give the give the sequence numbers from 1 to 10000 in the sno column to the begining rows in the table
(Oracle)
could u post the code plese
thanks & Regards
TangellaHow do you define "the beginning rows in the table"? Rows in a relational, heap table have no "order" to them. There is no concept of "first".
And once that is defined, why would you want to assign sequence number to only 10k our of "millions" of rows?

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9.2 issue with Sequence Numbers

We are using OWB 9.2 and RDBMS 9.2 on windows NT.
When using set based functionality i.e. Merge Statement, or Row Based, we have noticed that our sequence object gets incremented during updates even though it is only associated with the insert and not the update.
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Jagadish,
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******BUG******
Concise problem statement:
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Actually i have two tables.
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Sequence numbers - with no gaps!

I seek some advice from anyone with first hand experience in this area.
My need is simple; generate a new ID number for every order for use as the primary key.
Obviously this simple exercise could be a bottleneck as volumes ramp up, so I was pleased to find the Oracle feature to generate such numbers (efficiently presumably). However, upon closer reading it was apparent that aborted transactions would result in the loss of the number allocated to to that order if another transaction had obtained the next sequence number already (as one would want it to, rather than serializing transactions).
I don't want to have gaps in the sequence as the system needs a high degree of auditability. I am thinking of utilising the Autonomous Transaction feature to write the newly acquired sequence number to the order file with a flag indicating that the record is incomplete, and that record is to be skipped by normal system applications (but available to audit reports which will interpret the reason correctly), then returning to the far more extensive main transaction which updates many tables.
The other alternative is to control sequence numbers within the application itself, or try to get the sequence number as the very last step before writing the new order record, but this probably won't guarantee gapless reliability either. The ID itself has no significance, and it doesn't matter if an ID was used out of strict date/time sequence, so I really don't want to execute these updates serially.
So, my question is this:
a) do most people use the builtin sequence number feature?
b) if so, is there a standard technique for avoiding or accounting for gaps?
c) if the application must take over this task, should the counter for the last used ID be in a single row table to minimise bottlenecks caused by the thisrecord being locked? There will be several such counters for different aspects of the application, and i thought of having each in its own row in a small table, but I'm concerned about the whole table getting locked and freezing out otherwise-unrelated updates.
Thanks for any advice you may have.
CS

user8821725 wrote:
I seek some advice from anyone with first hand experience in this area.
My need is simple; generate a new ID number for every order for use as the primary key.
Obviously this simple exercise could be a bottleneck as volumes ramp up, so I was pleased to find the Oracle feature to generate such numbers (efficiently presumably). However, upon closer reading it was apparent that aborted transactions would result in the loss of the number allocated to to that order if another transaction had obtained the next sequence number already (as one would want it to, rather than serializing transactions).
I don't want to have gaps in the sequence as the system needs a high degree of auditability. One of the very very few reasons for me to have a requirement for "gapless" sequences is if you have a kind of checking mechanism outside of the database that is implemented using this gapless number. I had such a requirement once, when exchanging files with another bank where we had to ensure that each file was transferred correctly and in the right order. Your "high degree of auditability" might be a similiar requirement. Just remember as long as you are still inside the database you can use other mechanisms to increase auditability.
I am thinking of utilising the Autonomous Transaction feature to write the newly acquired sequence number to the order file with a flag indicating that the record is incomplete, and that record is to be skipped by normal system applications (but available to audit reports which will interpret the reason correctly), then returning to the far more extensive main transaction which updates many tables.Hm. I don't see why you want to use Autonomous Transactions for this. It might be useful to lessen locking conflicts , depending how your future sequence mechanism will be built.
>
The other alternative is to control sequence numbers within the application itself, or try to get the sequence number as the very last step before writing the new order record, but this probably won't guarantee gapless reliability either. The ID itself has no significance, and it doesn't matter if an ID was used out of strict date/time sequence, so I really don't want to execute these updates serially.I would go for generating the sequence as the very last step. It needs to be set to NOCACHE of cause. This will garantee that the sequence fetched from mySeq.nextval is gapless. The problem is then in your application. Your application must be built in a way that it ensures to use this sequence, or at least to create a noticable alert when this generated sequence can't be used anymore. In essence this means. Each unhandled (database) error that happens after you fetched the next sequence value must be raised in a way that informs all relevant people about this error.
Example: It might be that you use the sequence to write an order file. What happens if halfway through writing the file your disk runs out of space? This can be such an issue where a sequenced value will be lost. Your organisation must take care of those things.
>
So, my question is this:
a) do most people use the builtin sequence number feature?Yes. But for some tasks a sequence is not the best way, for example if you want a numbering for each item of your order. This "sequence" needs to restart with every new order.
b) if so, is there a standard technique for avoiding or accounting for gaps?NOCACHE => Avoids gaps during generation
Database Trigger => Tries to use the sequence as late as possible
c) if the application must take over this task, should the counter for the last used ID be in a single row table to minimise bottlenecks caused by the thisrecord being locked? There will be several such counters for different aspects of the application, and i thought of having each in its own row in a small table, but I'm concerned about the whole table getting locked and freezing out otherwise-unrelated updates.This is a possibility and the issues you describe are why we avoid such a solution in general. Autonomous transactions help to reduce the locking conflict, but they increase the chance that you produce gaps.
>
Thanks for any advice you may have.
CSOracle can guarantee to produce gapless sequences. But it can't guarantee that your application uses such a sequence in a gapless way.

Trouble with SEQUENCE, loosing numbers

Hi all, I use a sequence to generate the number of an invoice like this:
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Leo
null

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Yours is not an Oracle (or any other DB) problem; it is a design problem.
The reason that none of the suggested alternatives solve your problem is that there are undefined elements in your requirements.
There are actually two aspects to your of problem: 1) generating unique sequential numbers and 2) using those numbers.
I would suggest starting over and try to clearly define the problem and the requirements.
For example your stated requirements appear to be something like:
1. Invoice numbers must to be unique
2. Invoice numbers must be numeric
3. The first invoice number must be 27 (modify per your requirements)
4. Each new invoice must be numbered one higher than the previous invoice.
5. Invoice numbers must be sequential with no missing numbers.
While the above list seems to be complete there are some very important questions that are not yet answered.
1. When does an invoice become an invoice? That is, when is the invoice number assigned? Is the number assigned before or after the invoice record is committed to the database? If the number is assigned before committing (e.g. when the user begins processing an invoice) but the invoice is then abandoned and never committed there will be a gap in invoice numbers.
2. Can invoice records ever be deleted? If a committed record is deleted there will be a gap in the numbers. Some systems handle deletions by either flagging the records as deleted without actually deleting them or moving the records to a deleted table so that all invoice numbers are always accounted for.
Check printing applications used to print on pre-numbered check forms. The line printers that were used had sprockets to feed the checks and the first check could not be printed on since the sprockets were above the print head. The operator would enter the first check number into the system and the application created a check record marked VOID for that check number. This ensured that all pre-printed checks were accounted for and had not been misplaced or stolen.
Oracle's sequence generator can generate sequence numbers in sequential order and ensure that there are no gaps in the generation process.
Oracle cannot ensure that your application uses those numbers in a way that avoids gaps.
Even a normal INSERT trigger that might be used to get the next sequence value cannot be certain that the record it is inserting will actually be committed unless the COMMIT operation is performed within the trigger.
Sorry to 'rain on your parade' but withouth a better problem definition we can't give you a better solution.

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sanpanza wrote:
I am trying to merge two columns each with 100 rows and related data. Column one is the street address and column two have office numbers. The final result would be one column with 100 rows with address and office numbers.
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